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Vortex EF2211/EF2210
Reference Manual
VORTEX EF2211/EF2210 REFERENCE MANUAL
Polycom, Inc., Copyright 2003 1 Technical Support: 800.932.2774
Introduction....................................................................................................2
Features and Benefits ............................................................................................. 3
Pre-Installation...............................................................................................4
EF2211/EF2210 Front and Rear Panels................................................................ 5
Installation .....................................................................................................6
Mounting the EF2211/EF2210 ............................................................................... 6
Connecting the EF2211/EF2210 to Other Equipment ........................................... 6
Device IDs on the EF Bus....................................................................................... 8
Connecting Multiple Vortex Devices ...................................................................... 8
Factory Default Settings (Preset 0) ........................................................................ 9
Check Surrounding Equipment............................................................................... 11
Integrating the Unit Into Your System ..........................................................14
Input Settings .......................................................................................................... 14
Calibration.............................................................................................................. 14
Set up the Phone Interface (EF2211 Only)............................................................. 16
Build Your Echo Canceller Reference.................................................................... 16
Echo Canceller Reference for Multiple Vortex Devices......................................... 17
Configure the Automatic Microphone Mixer.......................................................... 18
Automixer Settings for Multiple Vortex Devices .................................................... 20
Configure the Matrix Mixer.................................................................................... 21
Building Your System with Multiple Vortex Devices.............................................. 21
The EF Bus ....................................................................................................23
Presets..................................................................................................................... 25
Other EF2211/EF2210 Features............................................................................ 25
LCD Menu Structure .....................................................................................26
System Menu ........................................................................................................... 28
Phone Control (EF2211 Only) ............................................................................... 29
Inputs ...................................................................................................................... 30
Outputs.................................................................................................................... 31
Automixer Menu...................................................................................................... 32
Matrix Menu ........................................................................................................... 34
Parametric EQ Menu.............................................................................................. 35
Presets..................................................................................................................... 36
Macros .................................................................................................................... 36
Troubleshooting .............................................................................................37
Automatic Microphone Mixer................................................................................. 37
Matrix Mixer........................................................................................................... 37
Echo Canceller Reference ...................................................................................... 37
Residual Echo ......................................................................................................... 37
Contacting Technical Support ................................................................................ 42
Technical Specifications ................................................................................43
Compliance............................................................................................................. 44
Conference System Design............................................................................49
EF2211/EF2210 Block Diagram ...................................................................50
Connector Pinouts..........................................................................................52
Connecting Unbalanced RCA to Balanced Terminal Block................................... 54
Making an EF Bus Terminator............................................................................... 54
Additional Notes ..................................................................................................... 55
Warranty Information ....................................................................................56
Definition of Terms .......................................................................................58
Index ..............................................................................................................61
INTRODUCTION
VORTEX EF2211/EF2210 Reference Manual 2 Technical Support: 800.932.2774
I
NTRODUCTION
Welcome Congratulations on your purchase of the Vortex EF2211/EF2210!
How to Use This
Manual
This is a reference manual for your EF2211/EF2210. Information specific to the
EF2211 or EF2210 will be noted as such. The major difference between the EF2211
and the EF2210 is that the EF2210 does not have a phone interface.
This manual is structured to provide the information you need quickly and conve-
niently. The following is an overview of each section:
• Introduction
• Pre-Installation includes information about the contents of the box, tools needed
for installation and front and rear panel descriptions.
• Installation covers connections of inputs/outputs and calibration of inputs of the
EF2211/EF2210.
• Integrating the Unit Into Your System describes adjustments to take into consid-
eration when integrating the EF2211/EF2210 with surrounding equipment in
your system.
•LCD Menu Structure describes an overview of the LCD menu structure and also
gives a system overview of features and options available.
• Troubleshooting helps to debug problems with installation.
• Technical Specifications provides the technical specifications of the EF2211/
EF2210.
• Conference System Design gives suggestions on topics to consider when design-
ing your system.
• EF2211/EF2210 Block Diagram shows the inside of the EF2211/EF2210.
• Connector Pinouts shows pinout diagrams for EF2211/EF2210 input and output
connectors.
• Warranty Information
• Definition of Terms explains terms used in this manual, as well as terms used in
our technology of echo cancellation, noise cancellation, and audio conferencing.
About the
EF2211/EF2210
The EF2211/EF2210 features industry-leading acoustic echo cancellation technology,
which keeps received audio from being re-transmitted to its original location, and pat-
ented noise cancellation algorithms which dramatically reduce ambient noise in the
audio sent to other sites without affecting speech quality.
Also included in the microphone input is a neural network Automatic Gain Control
that reacts only to valid speech patterns to bring voices within desired levels. AGC
controls are user-adjustable, as are settings for the 5-band parametric EQ offered on
all input and output channels in the EF2211/EF2210.
The EF2211 includes a telephone interface with ambient noise cancellation, which
can dramatically improve the receive audio quality on phone calls.
The EF2211/EF2210 may be programmed directly from the front panel, or through
our Conference Composer software (included), which programs the unit via RS-232.
The unit may additinally be controlled via external RS-232 devices.
INTRODUCTION
© Polycom, Inc. 3 VORTEX EF2211/EF2210 Reference Manual
Product
Registration
Please take a moment to fill out and return your registration card. This information
will help us to provide you with better customer support and will allow us to notify
you with updated product features and software.
F
EATURES
AND
B
ENEFITS
• 1 mic/line input, 2 line inputs, 3 line outputs
• Includes a telephone hybrid, with noise cancellation, for adding phone calls to
conferences
• Country specific telephone configuration settting allow use almost anywhere
• 10 Watt power amplifier for driving audio in the room
• Industry-leading acoustic echo and noise cancellaltion ensure the highest possi-
ble audio quality between sites
• Includes matrix mixer with arbitrary cross point gain values
• Ambient noise cancellation on mic/line input and telephone receive audio
• 5-band parametric EQ on all inputs and outputs
• Up to 32 user configurable presets, 16 factory presets, and 256 macros for flexi-
ble control
• May be linked with other Vortex devices via the EF Bus including EF2280,
EF2241, EF2211, EF2210, EF2201, or other Polycom products
PRE-INSTALLATION
VORTEX EF2211/EF2210 Reference Manual 4 Technical Support: 800.932.2774
P
RE
-I
NSTALLATION
What’s Included The Vortex EF2211/EF2210 product package includes the following items:
• Vortex EF2211/EF2210 Reference Manual
• Vortex EF2211/EF2210
• External power supply
• Cat 5 cable for EF Bus
• Telephone cable (NOT included with the EF2210)
• Rack mount screws (4)
• 3.5 mm terminal block connectors (6)
• Cable clamp and screw
• CDROM containing other manuals and Conference Composer software
• Product Registration Card
What’s Not
Included
The following equipment is not included with the EF2211/EF2210 product package,
but may be necessary to create a completely functional system:
• Microphones
• Loudspeakers
• Audio cables
• Videoconferencing codec or other four-wire interface (optional)
• RS-232 remote control device (optional)
Tools Needed for
Installation
• Screwdriver to mount the EF2211/EF2210 in your rack.
• 3.5 mm terminal block connector screwdriver
Figure 1. What’s Included with your Vortex EF2211/EF2210.
DOWN HOMEUP
0-3-7-12-20 3 dB
METER
920
PHONE CONNECT
ORTEXORTEXORTEXORTEXOR TEXOR TEXORTEXOR TEXOR TEXORTEXORTEXOR TEXOR TEXORTEXORTEXORTEX
ORTEXORTEXORTEXORTEXOR TEXORTEXORTEXOR TEXORTEXORTEXOR TEXORTEXORTEXOR TEXORTEXOR TEX
EF2211
Vortex
®
EF2211
Vortex
®
EF2210
Cable Clamp
and screw
1-Cat 5 cable
for EF
Bus
1-Telephone cable
External
Power Supply
OR
CD with
control software and manuals
Vortex EF2211/EF2210 Reference
Manual
Vortex
®
EF2211/EF2210
Reference Manual
Terminal Block
Connectors (6)
Rackmount
Screws (4)
x
x
x
x
PRE-INSTALLATION
© Polycom, Inc. 5 VORTEX EF2211/EF2210 Reference Manual
EF2211/EF2210 F
RONT
AND
R
EAR
P
ANELS
1. LCD DISPLAY. Displays menu instructions for configuration and operation of the
EF2211/EF2210.
2. D
OWN BUTTON. Scrolls backward through menu items at a particular level or
decreases the value of a parameter.
3. U
P BUTTON. Scrolls forward through menu items at a particular level or increases
the value of a parameter.
4. E
NTER. Enters the menu and allows you to select and change parameter values.
5. E
SC. Returns to the next highest level of menus.
6. H
OME. Returns to the top of the menu structure.
7. L
EVEL INDICATOR. Indicates the level of the selected channel or parameter.
8. P
HONE CONNECT. Takes the phone line on or off hook. If you have an analog
handset connected to the P
HONE jack on the back panel, pushing this button will
disable the P
HONE jack while enabling the LINE jack (see Item 17).
* This feature is not available on the EF2210.
9. M
IC ACTIVITY LED. Indicates gating activity on the mic/line channel input.
10. I
NPUT PARALLEL PORT. Parallel logic input.
* This feature is not available on the EF2210.
11. O
UTPUT PARALLEL PORT. Parallel logic output.
* This feature is not available on the EF2210.
12. EF B
US IN. Connects to EF BUS OUT of another Vortex device.
13. EF B
US OUT. Connects to the EF BUS IN of another Vortex device.
14. RS-232 S
ERIAL PORT. Connect this to an optional RS-232 remote control device,
such as a touch panel or personal computer COM port.
15. P
OWER SUPPLY INPUT. Connects to the external power supply provided with the
EF2211/EF2210.
16. P
OWER AMPLIFIER OUTPUT. Drives up to 10 W into 4-16 Ohm speakers.
17. P
HONE/LINE JACKS. Use the PHONE jack for connecting an analog handset to the
system. Use the L
INE jack for connecting to an analog telephone line.
* This feature is not available on the EF2210.
18. I
NPUTS. Includes inputs for a microphone or line level input, remote end audio
(line level), and program audio (line level).
19. L
INE OUTPUTS. Line level outputs for an amp, remote audio, and record audio.
Figure 2. EF2211/EF2210 Front and Rear Panels
DOWN HOMEUP
0-3-7-12-20 3 dB
METER
920
PHONE CONNECT
ORTEXORTEXORTEXORTEXORTEXORTEXORTEXORTEXORTEXORTEXORTEXORTEXORTEXORTEXORTEXORTEX
ORTEXORTEXORTEXORTEXORTEXORTEXORTEXORTEXORTEXORTEXORTEXORTEXORTEXORTEXORTEXORTEX
EF2211
1 23 45 6 78* 9
OUTPUT
INPUT
REMOTE CONTROL
RS-232
EF BUS IN
EF BUS OUT
PHONE LINE
+5, +/-15 VDC
+5, +/-15 VDC
RS-232 PIN 2: TXD, PIN 3: RXD, PIN 5: GROUND, PIN 7: CTS, PIN 8: RTS
EF2211VORTEX
SPEAKER
BA1
OUTPUTS
BA1
INPUTS
10* 11*
1312 14 15 16 17* 1819
INSTALLATION
VORTEX EF2211/EF2210 Reference Manual 6 Technical Support: 800.932.2774
I
NSTALLATION
This equipment is intended to only be installed by qualified service personnel. The
equipment shall be connected to a socket-outlet that provides a protective earthing
connection.
North American
Requirement
CAUTION-To reduce the risk of fire, use only No. 26 AWG or larger telecommunica-
tion line cord.
M
OUNTING
THE
EF2211/EF2210
The EF2211/EF2210 can be mounted in a rack enclosure using four large screws (10-
32x1/2”) included with the unit. One EF2211/EF2210 fits in a single rack space.
Recommendation
For Easy Access
While not required, leave a single rack space in between the EF2211/EF2210 and
other units in your rack. This gives you easier access to the back panel.
Instructions for
Securing Power
Supply to Back of
EF2211/EF2210
• Locate the cable clamp on the back panel of the EF2211/EF2210 above the
power connector.
• Remove the screw and thread the power cord through the cable clamp.
• Attach the cable clamp to the back panel of the EF2211/EF2210 and tighten the
screw. Align the clamp so that the power cable does not interfere with the con-
nectors on the EF2211/EF2210 back panel.
• Plug in the power supply.
• We recommend that you also Ty-wrap the power supply to the rack. The purpose
of securing the power supply to the back panel is so that if the power supply were
to drop, it would pull where the cord is attached with the cable clamp and not pull
the plug out of the EF2211/EF2210.
C
ONNECTING
THE
EF2211/EF2210
TO
O
THER
E
QUIPMENT
Grounding The EF2211/EF2210 has 1 mic/line input plus 2 line level inputs and 3 line level out-
puts. Each input/output is “Pin 1 compatible” — this means that the ground pin of
each input/output is tied to chassis ground. Chassis ground is connected to the input
power ground.
Caution! Do not use any other power supply other than the one pro-
vided with this unit.
INSTALLATION
© Polycom, Inc. 7 VORTEX EF2211/EF2210 Reference Manual
Typical EF2211/
EF2210
Connections
The EF2211/EF2210 will typically be connected to other equipment in a single room
setup as shown below in Figure 3 and Figure 4.
The following steps are typically used to set up the EF2211/EF2210:
• Connect a microphone or line level microphone mix into the M
IC INPUT. Each
Figure 3. Block diagram of typical EF2211/EF2210 connections: a single room using one device.
NOTE: The phone interface is not available on the EF2210.
Figure 4. Typical EF2211/EF2210 connections.
NOTE: The phone interface and parallel logic ports are not available on the EF2210
Polycom Video
CODEC
Line In Line Out
PSTN
Line
Vortex
®
EF2211
Mic In
Far In
Prgm In
Amp Out
Far Out
Rec Out
Spk Out
Phone
EFBus OutEFBus In
OUTPUT
INPUT
REMOTE CONTROL
RS-232
EF BUS IN
EF BUS OUT
PHONE LINE
+5, +/-15 VDC+5, +/-15 VDC
RS-232 PIN 2: TXD, PIN 3: RXD, PIN 5: GROUND, PIN 7: CTS, PIN 8: RTS
EF2211
V
ORTEX
SPEAKER
BA1
OUTPUTS
BA1
INPUTS
PSTN
Polycom Video Codec, 4-wire Connection
Vortex
®
EF2211
POLYCOM CODEC
TX RX
INSTALLATION
VORTEX EF2211/EF2210 Reference Manual 8 Technical Support: 800.932.2774
input accepts 3.5 mm terminal block connectors. See “Connector Pinouts” on
page 52 for pinouts of the terminal block connectors.
• Connect S
PEAKER OUTPUT to loudspeaker or AMP OUTPUT to the room amplifier.
• If RS-232 remote control is desired, connect the RS-232 R
EMOTE CONTROL port
of the EF2211/EF2210 to the remote control device, such as an RS-232 interface
to a touch panel or a COM port on a personal computer.
• On the EF2211, connect the L
INE RJ11 jack to an analog telephone line.
• On the EF2211, connect the P
HONE RJ11 jack to an analog telephone set
(optional).
• Connect the external power supply to the P
OWER SUPPLY INPUT jack of the
EF2211/EF2210.
• Set the country code on the EF2211. By default the phone interface will be dis-
abled until you select a country code for the telephony interface. This can either
be done with the front panel LCD menu, or the RS-232 interface. The country
code only needs to be selected the first time or when the country of the installa-
tion is changed.
D
EVICE
ID
S
ON
THE
EF B
US
When considering which Device IDs can be used for which Vortex device, decide
how many devices have the ability to transmit on the W, X, Y, and Z busses, and how
many have the ability to transmit on the P Bus. The EF2210, for example can only
transmit on the W, X, Y, and Z busses while the EF2211 can transmit on the W, X, Y,
and Z busses as well as the P bus. Up to 8 devices can transmit on the W, X, Y, and Z
busses. Similarly, up to 8 devices can transmit on the P bus. Note that the EF2211
counts as one of both types. All devices that can transmit on the same bus output(s)
must have unique device IDs. If the device IDs of linked Vortex devices are the same,
the front panel LCD screen will display “EFBus Error: Dev. ID Conflict”.
C
ONNECTING
M
ULTIPLE
V
ORTEX
D
EVICES
Up to 8 echo cancellation Vortex devices in combination can be linked together at one
time and up to 8 phone interface Vortex devices in combination can be linked together
at one time (See Device IDs on the EF Bus above). Keep in mind that there are units
that are considered one of both types (such as the EF2241 or EF2211). Each unit in
the chain must have a unique Device ID. Use the EF Bus to link multiple Vortex
devices together.
The following steps should be followed to connect the EF Bus:
1. Set a unique Device ID for each Vortex device. The Device IDs range from 00 to
07.
2. Power off all units.
3. Connect the RS-232 remote control device to any Vortex device in the chain.
4. Connect the provided Cat-5 cable between the EF B
US OUT of the first device,
and the EF B
US IN of the second device.
Note.
The EF Bus must be connected so that the EF Bus In of one
box is connected to the EF Bus Out of another. Connecting
the EF Bus In to another EF Bus In (or Out to Out) will not
work.
INSTALLATION
© Polycom, Inc. 9 VORTEX EF2211/EF2210 Reference Manual
5. Connect another Cat-5 cable between the EF BUS OUT of the second device and
the EF B
US IN of the third device, and so on.
6. Power on all units at the same time.
Terminating the
EF2211/EF2210
The EF2211/EF2210 is self-terminating so its EF Bus does NOT need to be termi-
nated. However, if you are linking the EF2211/EF2210 to EF2280s, terminate the EF
Bus link.
F
ACTORY
D
EFAULT
S
ETTINGS
(P
RESET
0)
The following is a list of the factory default settings of the EF2211/EF2210. Since the
microphone and other equipment in your application may have different nominal lev-
els, you can start with a F
ACTORY PRESET (Presets 0-15), change it to match your
environment and then save it within the EF2211/EF2210 as a U
SER PRESET (Presets
16-47). Once you’ve saved a U
SER PRESET, set the POWER ON PRESET to that USER
Figure 5. Only the EF2280 needs to be terminated when linked together with
EF2211/EF2210s.
Vortex EF2280
EF Bus Terminator
Cat-5 cable
Vortex EF2280
Vortex EF2210
Cat-5 cable
No Terminator
Needed
INSTALLATION
VORTEX EF2211/EF2210 Reference Manual 10 Technical Support: 800.932.2774
PRESET (or whichever preset you want to come up after power up). The unit will need
to be configured for your system.
PROGRAM PARAMETERS FACTORY DEFAULT PRESET VALUE
SYSTEM PARAMETERS
Preset 0
Device ID 0
Baud Rate 9600
Flow Control Off
INPUT CHANNELS
Acoustic Echo Cancellation
(Input 1)
On
Automatic Gain Control (AGC),
Input 1
On
AGC Rate (Input 1) 1 dB/s
AGC Maximum (Input 1) 3 dB
AGC Minimum (Input 1) -3 dB
Echo Canceller Reference
(Input 1)
Ref1
Filtering Off
Input Gains Mic Mode + 15 dB = 48 dB for Input 1
0 dB for Inputs A-B
Mute Off
Noise Cancellation (Input 1) On
Noise Cancellation Level
(Input 1)
10 dB
Phantom Power (Input 1) On
OUTPUT CHANNELS
Mute Off
Output Gain 0 dB
PHONE CONTROL (EF2211 ONLY)
Auto Answer
Off
Auto Hangup Call Progress
Off
Auto Hangup Loop Drop
Off
Dial Tone Gain
0 dB
DTMF Gain
0 dB
Ring Tone Enable
On
INSTALLATION
© Polycom, Inc. 11 VORTEX EF2211/EF2210 Reference Manual
Presets and
Multiple Vortex
Devices
PRESET 0 is preconfigured for a system with multiple Vortex devices. In Preset 0, the
microphone is bussed out to other units on the W Bus. Microphones are also input
into each device on the W Bus (I
NPUT WM0 in the Matrix).
If you have multiple devices in your system, save settings to a user preset (Presets 16-
47) on each device. Saving a preset will only save the preset on that particular unit so
save the preset to each Vortex device. Also, remember to set the P
OWER ON PRESET
on each device to the User Preset that you have saved your settings to otherwise the
device will revert back to Preset 0 (factory default) if power is lost.
C
HECK
S
URROUNDING
E
QUIPMENT
Now that the physical connections to the EF2211/EF2210 are set up, it may be neces-
sary to check the surrounding equipment to make sure levels are set correctly. The
following suggestions may be helpful in integrating the EF2211/EF2210 into your
system:
Pick a Standard
Signal Level
A standard nominal signal level should be used throughout the audio system. Any
equipment that does not operate at this standard level should be compensated for as
Entry and Exit Tone Enable
On
PHONE INPUT (INPUT T), EF2211 ONLY
Automatic Gain Control (AGC) On
AGC Maximum 12 dB
AGC Minimum -6 dB
AGC Rate 1 dB/s
Phone Input Gain 0 dB
Mute Off
Noise Cancellation On
Noise Cancellation Level 5 dB
Line Echo Cancellation On
Dynamics Processing On
Filtering Off
PHONE OUTPUT (OUTPUT T), EF2211 ONLY
Mute Off
Phone Output Gain 0 dB
Dynamics Processing On
Filtering Off
PROGRAM PARAMETERS FACTORY DEFAULT PRESET VALUE
INSTALLATION
VORTEX EF2211/EF2210 Reference Manual 12 Technical Support: 800.932.2774
close to the piece of equipment as possible. A 0 dB nominal level is a good standard
signal level. For example, a consumer VCR will probably generate a -8 dBu level.
As soon as the VCR signal arrives at an input with some gain control, the input gain
should be adjusted so that you get a 0 dB level, i.e. adding 8 dB of gain.
Check Levels to
the Codec
Configure the matrix mixer output to the codec input.
The output gain of the matrix mixer should be set to match the nominal input level of
the codec. For example, if the codec accepts -10 dBV (-8 dBu) inputs, 8 dB of atten-
uation should be applied at the matrix mixer output to the codec.
Configure the matrix mixer input from the codec output.
The input gain of the matrix mixer should be set to match the nominal output level of
the codec. For example, if the codec outputs a -10 dBV (-8 dBu) level, 8 dB of gain
should be applied on the matrix mixer input. This will bring the codec level up to 0
dBu inside the matrix.
Verify Room Gain After adjusting the loudspeaker level, verify the room gain in your system using the
R
OOM GAIN meter on the DIAGNOSTICS page of Conference Composer. Room gain
refers to the relative level of the audio going to your amplifier (remote end speech or
telephone speech) and the level of this audio being picked up by the microphone. The
Room Gain measurement is only accurate when just the remote talkers are speaking.
If local talkers are speaking too, the room gain meters are not accurate. See Figure 6
below. The meter shows the room gain, which is the relative level of the output level
and the input level. While the EF2211/EF2210 will operate in positive room gain
conditions, the room gain should be around 0 dB or a negative value. If you have a
positive room gain, make adjustments in the following areas:
1. Decrease the Input Gain of the microphone.
2. Decrease the Output Gain of the microphone.
INSTALLATION
© Polycom, Inc. 13 VORTEX EF2211/EF2210 Reference Manual
3. OR adjust the placement of the microphone relative to the loudspeaker.
Configure
Program Audio
Sources
Set the gain on the matrix mixer input from the program audio source so that program
audio is played into the room at a level similar to that of speech from the remote site.
This should also ensure that the program audio level is good when sent to the remote
site.
Figure 6. Room Gain Meter on the Diagnostics page of the Conference Composer
control software.
Room Gain Meter
Read Room Gain
from here
INTEGRATING THE UNIT INTO YOUR SYSTEM
VORTEX EF2211/EF2210 Reference Manual 14 Technical Support: 800.932.2774
I
NTEGRATING
THE
U
NIT
I
NTO
Y
OUR
S
YSTEM
Operating the
EF2211/EF2210
The EF2211/EF2210 can be operated in two ways: through the LCD menu on the
front panel or through RS-232. For control via RS-232, please refer to the EF2211/
EF2210 Programming Guide, which includes programming tips as well as the
EF2211/EF2210 RS-232 commands. For operation using the PC control software,
Conference Composer, please refer to the Conference Composer User Guide.
Use Conference Composer software to easily configure the EF2211/EF2210 with a
PC, or refer to the Applications Guide for different configurations that are already
programmed into factory presets.
I
NPUT
S
ETTINGS
Set Input 1 for
Mic or Line Level
Configure Input 1 for mic or line level using the LCD menu (See “Level (Input 1)” on
page 30) or Conference Composer Control Software (See the Conference Composer
User Guide). Setting the input to mic level adds 33 dB of gain to the input stage. If
you are connecting one microphone to the device, choose Mic level (with the default
input gain value of 15 dB, a total of 48 dB of gain is applied to the input). If you are
connecting an external automatix microphone mixer to the input, choose Line level.
Select Phantom
Power for Input 1
Turn phantom power On or Off for Input 1 using the LCD menu (See “Phantom
Power (Input 1)” on page 30) or Conference Composer Control Software (See the
Conference Composer User Guide). Phantom power should be turned On for con-
denser and electret microphones.
Set Levels on Line
Input Channels
Set the line input channel gains (Channels A-B) to match the nominal level of the
incoming equipment. The line inputs have a maximum nominal level of 0 dBu. If
your incoming line level inputs have a higher nominal level than 0 dBu you will want
to use a pad to remove the level.
If you are connecting from equipment that has RCA plugs, you will most likely need
8 dB of gain on the Input and -8 dB of gain on the Output.
C
ALIBRATION
When using the factory default, Preset 0, the following calibration can be used.
Set Mic/Line
Input Gain
In Preset 0, Automatic Gain Control (AGC) is On and the microphone gain on Input 1
is set to 15 dB. The AGC will compensate for the microphone gain. If you are using
a ceiling microphone, set the microphone gain to 28 dB.
INTEGRATING THE UNIT INTO YOUR SYSTEM
© Polycom, Inc. 15 VORTEX EF2211/EF2210 Reference Manual
Fine tune the Input Gain using the Automatic Gain Con-
trol (AGC) meter on Conference Composer Software. In
the Conference Composer Software, go to the D
IAGNOSTICS page. Watch the meter
labelled AGC while someone is talking into the particular channel that you are adjust-
ing. Watch the number in the box at the bottom of the AGC meter (See Figure 7
below). This is the amount of gain that the AGC is applying. The goal is to have the
AGC meter on average staying around 0. If the level that you see in the box is nega-
tive, decrease the input gain by the average number that you see in the box because
the AGC is attenuating the channel’s input gain because the level is too high. If the
number in the box is positive, increase the input gain on that channel because the
AGC is boosting the signal because it is too low. For example, if the meter is showing
an average gain of -15 dB, you should increase your input gain by 15 dB. If the meter
shows an average gain of +10 dB, you should decrease your input gain by 10 dB.
Figure 7. AGC Meter on the Diagnostics page of the Conference Composer soft-
ware. The gain adjustment is the same gain control on the Mic/Line Inputs page in
Conference Composer.
I
F THE AGC METER SHOWS... ADJUST THE INPUT GAIN IN THIS WAY.
positive gain Increase gain by the level
shown in the box.
negative gain Decrease gain by the level
shown in the box.
Table 1: How to set the Input Gain using the AGC meter on the Conference
Composer Diagnostics page.
AGC Level Meter
Read AGC level
Adjust Input Gain here
INTEGRATING THE UNIT INTO YOUR SYSTEM
VORTEX EF2211/EF2210 Reference Manual 16 Technical Support: 800.932.2774
Customize
Setting for Your
Particular
Application
The following sections will describe customizing parameters on the EF2211/EF2210
for your particular application if you are not using Preset 0.
S
ET
UP
THE
P
HONE
I
NTERFACE
(EF2211 O
NLY
)
The echo canceller reference of the EF2211 is by default set up with the phone input
already assigned to it.
By default the phone interface will be disabled until you select a country code for the
telephony interface. This can either be done with the front panel LCD menu, or the
RS-232 interface. The country code only needs to be selected the first time or when
the country of the installation is changed.
Send audio from the phone to the outputs on the same device by unmuting the cross-
point of Input T on that output. Send audio from the phone to other linked devices by
using the P bus output in the EF Bus. The linked devices can take the phone signal
off the bus from the P Bus input.
B
UILD
Y
OUR
E
CHO
C
ANCELLER
R
EFERENCE
The acoustic echo canceller (AEC) reference should generally contain exactly the
same audio signals as what is coming out of your loudspeaker(s) minus any local
microphone(s) that might be used for sound reinforcement, since the signal output
from the loudspeaker is what is then picked up by the room’s microphones causing
acoustic echo. Note that this statement is a general statement. Conditions for this
being true follow:
If your system
does NOT have
sound
reinforcement,
• The AEC reference should contain exactly the same audio as the loudspeaker
output: all far end audio, audio from the phone add, program audio, etc.
• If you are using crosspoint gains in the loudspeaker mix, apply the same gains to
the signals in your reference.
If your system
has sound
reinforcement,
• Do NOT mix your room microphones into the reference, but include all other
audio (program audio, remote audio, phone audio, etc.).
an average level of 0 dB You’ve set the Input Gain
to a good level!
Table 1: How to set the Input Gain using the AGC meter on the Conference
Composer Diagnostics page.
INTEGRATING THE UNIT INTO YOUR SYSTEM
© Polycom, Inc. 17 VORTEX EF2211/EF2210 Reference Manual
E
CHO
C
ANCELLER
R
EFERENCE
FOR
M
ULTIPLE
V
ORTEX
D
EVICES
In a system with multiple devices, we recommend that one device be designated as
the unit that provides the EF bus reference for the acoustic echo cancellers. This unit
takes its reference signals and places it on the EF bus. All other units that are linked
together may use the EF bus reference as the reference for their echo canceller, or
they can use their own internal reference(s). The reference may include a mix of any
input, with crosspoint gains, including W, X, Y, and Z busses. Set the EF Bus Refer-
ence in the System Menu of the LCD Menu (See “EF Bus Reference” on page 28).
Setting up the
Bus Reference
If all far end audio and program audio sources are on the
same Vortex device.
1. Assign far end audio and program audio sources to Reference 1 on the originat-
ing device.
2. On the EF Bus page in Conference Composer for the originating device, set the
Exported Signals to R
EFERENCE 1. Only one device can put an echo canceller
reference on the EF Bus as the Bus Reference.
3. On all linked devices, set the echo canceller reference to B
US.
For example, a system uses 1 EF2211, 1 EF2280, and 1 Polycom VS4000 video
codec. The Reference 1 is set up on EF2280 with ID 0. The Matrix for this EF2280
in Conference Composer is shown in Figure 8 and the EF Bus page in Figure 9. Con-
ference Composer will not allow more than one device assign their echo canceller ref-
erence as the Bus Reference. Notice that the phone audio and VS4000 inputs are both
assigned to Reference 1 on the originating EF2280. The Matrix for any linked
devices is shown in Figure 10.
Figure 8. Matrix page of origin EF2280 (ID 00) Figure 9. EF Bus page of origin EF2280 (ID 00)
INTEGRATING THE UNIT INTO YOUR SYSTEM
VORTEX EF2211/EF2210 Reference Manual 18 Technical Support: 800.932.2774
If far end audio and program audio sources are on sev-
eral Vortex devices.
1. Bus each far end audio and program audio source to each device. Do this by
assigning each signal input to either the W, X, Y or Z bus.
2. Assign an echo canceller reference on each device that will include all far end
audio and program audio sources.
C
ONFIGURE
THE
A
UTOMATIC
M
ICROPHONE
M
IXER
The EF2211/EF2210 contains one automatic microphone mixer. Input 1 may be
assigned to automatic mixer 1 or no automatic mixer. Set the input channel to use
neither automatic mixer if an input is not actually a microphone, but is a program
audio input.
If you have a PC, use the Conference Composer software (See the Conference Com-
poser User Guide) to set the automixer parameters. If you would like to set automixer
parameters using the LCD menus, see “Automixer Menu” on page 32 for instructions
on setting automixer parameters.
Automixer
Parameters
The following parameters configure how the EF2211/EF2210 automatic microphone
mixer operates. Parameters include the following: Decay Time, Hold Time, Camera
Gating Threshold, Chairman Mode, Chairman Mic, Last Mic On Mode, Last Mic
Number, Local Max NOM, Global Max NOM, Automixer Reference, Reference
Figure 10. Matrix page of linked devices
INTEGRATING THE UNIT INTO YOUR SYSTEM
© Polycom, Inc. 19 VORTEX EF2211/EF2210 Reference Manual
Bias, Off Attenuation, Threshold Type, Gating Mode, Adaptive Threshold, Manual
Threshold, and Gate Priority.
Global Settings.
Decay Time. Decay time is the amount of time the microphone audio takes to
ramp down to the Off Attenuation level after Hold Time. Decay Time values
range from 0 to 5000 msec. The default value is 1000 msec.
Hold Time. This is the amount of time the microphone stays On after the
energy in the channel drops below the gating threshold. The default value is 500
msec. The range is 1 to 5000 msec. Microphone channels gating On and Off too
frequently during short pauses in speech might be the result of setting the Hold
Time too low while too many microphones gating on at the same time may be the
result of Hold Time values that are too high.
Camera Gating Threshold. Specifies the hold time for camera gating infor-
mation.
Mixer Settings.
Bus Mixer. This command is used to assign the automixer to one of the EF Bus
automixer groups. Setting the Bus Mixer to the same number as the automixer
on another Vortex device will allow the devices to be one large automixer. Set-
ting Bus Mixer to 0 means that the automixer is not grouped on the EF Bus and
the automixers operate independently.
Chairman Mode. Enables or disables Chairman Mode for the automixer.
Chairman Mic. Sets the Chairman Microphone for the automixer.
Last Mic On Mode. Sets “Last Mic On” mode for the automixer.
Last Mic Number. Sets the microphone number that will remain on when
“Last Mic On” mode is set to manual. Setting this value to 0 will cause the auto-
mixer to leave the last open microphone on. The last microphone number is
specified for the automixer, but is only used in manual “Last Mic On” mode.
Local Max NOM. Sets the maximum number of open microphones (NOM)
limit for the automixer. This NOM limit is a “local” limit, meaning that this limit
applies only to the specific Vortex device that it is set on.
Global Max NOM. Sets the global maximum number of open microphones
(NOM) limit for each linked automixer. The maximum value for this command
is 64. This NOM limit is a “global” limit, meaning that this limit applies to all
linked automixers with the same Bus ID.
Off Attenuation. Sets the Off Attenuation (in dB) for the automixer. Setting
Figure 11. Off Attenuation, Hold Time, Adaptive Threshold, and Decay Time.
Ambient Level
ADAPTIVE THRESHOLD
Channel OFF
Channel ON
Channel turns on when
signal level is above
Adaptive Threshold
Microphone
Audio
Time
Signal Level
HOLD
T
IME
OFF ATTENUATION
DECAY
T
IME
INTEGRATING THE UNIT INTO YOUR SYSTEM
VORTEX EF2211/EF2210 Reference Manual 20 Technical Support: 800.932.2774
this value to 18 would result in the microphone signals being attenuated by 18 dB
when gated off. This value is set independently for the automixers.
Automixer Reference. When enabled, the echo canceller reference becomes
a muted input in the automix so that far end audio coming from the speakers does
not gate on local microphones.
Reference Bias. Adjusts how much gain is applied to the Automixer Refer-
ence signal. The higher the gain, the harder it will for local talkers to gate on a
microphone.
Channel Settings.
Automixer. This allows you to select between no automixer and Mixer 1 for
Input 1.
Threshold Type. Sets adaptive or manual automatic gating thresholds per
input. The default is adaptive.
Gating Mode. Sets the automixer gating control mode for the input channel 1.
The possible modes are Normal Gating, Microphone Forced On, or Microphone
Forced Off.
Adpative Threshold. This allows you to determine when to gate a micro-
phone on based on an estimate of the background noise level. The default value
is to gate a channel on if it is more than 10 dB louder than the background noise
level. Values range from 0 to 100 dB. To set the Adaptive Threshold, scroll
through the Adaptive Threshold range and select the desired Adaptive Threshold
by pressing E
NTER.
Manual Threshold. Sets the automixer gating threshold for input channel 1.
This value is only used if the input set to Manual Gating via the T
HRESHOLD
T
YPE option.
Gate Priority. The priority of each microphone can be assigned a value rang-
ing from 1 to 4. Priority 1 microphones have priority over priority 4 micro-
phones for gating. The default is to have all microphones set to priority 1. If
Chairman Mode is enabled, all microphones including ones with priority of 1
will be gated off when the Chairman mic gates on.
A
UTOMIXER
S
ETTINGS
FOR
M
ULTIPLE
V
ORTEX
D
EVICES
When using more than one Vortex device in your room system, you have several pos-
sibilities for how you configure the automixer. Each device can operate as one of the
following:
• One automixer, independent of other devices linked to it
• Two automixers, independent of other devices linked to it (applies only to Vortex
devices with 2 automixers)
• One large automixer, sharing automixer functions with other devices linked to it
• Two large automixers, sharing automixer functions with other devices linked to it
(applies only to Vortex devices with 2 automixers)
Figure 12. Vortex device Automixer Settings in Conference Composer Software
INTEGRATING THE UNIT INTO YOUR SYSTEM
© Polycom, Inc. 21 VORTEX EF2211/EF2210 Reference Manual
Automixer and
Bus Mixer
Settings
To operate the Vortex device in any of the above possibilites, two global parameters
need to be changed: the A
UTOMIXER and the BUS MIXER (see Figure 12). The AUTO-
MIXER parameter chooses which automixer the input channel will be on (this is
changed either on the A
UTOMIXER page in Conference Composer or on the MATRIX
M
IXER page).
The B
US MIXER parameter is used to assign one of the two internal automixers to one
of the EF Bus automixer groups. For example, consider three Vortex devices, each of
which has 2 microphones assigned to Automixer 1 and 2 microphones assigned to
Automixer 2. Now, if each of these devices sets their Automixer 1 to have Bus ID 5,
then the three automixers (one from each device) will work as a single automixer con-
taining 6 (3 x 2) microphones. Setting B
US MIXER to 0 means that the automixer is
not grouped on the EF Bus.
Operating as an
Independent
Automixer
To set the Vortex device to operate as an independent automixer (or two), set the BUS
M
IXER parameter to 0, or to a number that is different from any other automixer group
on the EF Bus.
Operating as One
Automixer with
Multiple Vortex
Devices
To set the Vortex device to operate as one automixer across several devices, set the
B
US MIXER parameter on all devices to the same automixer group.
Default Settings In the default preset (Preset 0), the Bus Mixer for Automixer 1 is set to 1 and the Bus
Mixer for Automixer 2 is set to 2. This means that in the default mode, all linked
devices will work together as one complete automixer.
C
ONFIGURE
THE
M
ATRIX
M
IXER
The matrix mixer allows arbitrary crosspoint gains in 1 dB increments between any
input and output signal.
If you have a PC, use the Conference Composer software (See the Conference Com-
poser User Guide) to set the matrix parameters. If you would like to set matrix
parameters from the LCD menus, see “Matrix Menu” on page 34 for descriptions and
instructions on setting matrix mixer parameters.
B
UILDING
Y
OUR
S
YSTEM
WITH
M
ULTIPLE
V
ORTEX
D
EVICES
The following is a checklist for building a system with mutliple devices:
1. Assign Inputs.
2. Assign Outputs.
3. Configure submatrix (the EF Bus).
4. Configure your echo canceller reference.
INTEGRATING THE UNIT INTO YOUR SYSTEM
VORTEX EF2211/EF2210 Reference Manual 22 Technical Support: 800.932.2774
1. Assign Inputs Assign each audio source to an input. Remember to include the conferencing equip-
ment such as a video codec and any program audio.
2. Assign Outputs Try to assign as many outputs as you can to one Vortex device to make a simpler sub-
matrix. The bussing gets more complicated if you choose to spread your outputs over
several units.
3. Configure the
submatrix.
To link multiple devices together, use the submatrix on the EF Bus to configure
which signals to receive from other devices that have put their signals on the Bus.
THE EF BUS
© Polycom, Inc. 23 VORTEX EF2211/EF2210 Reference Manual
T
HE
EF B
US
The EF Bus is a high speed, low delay digital bus that includes the W, X, Y, and Z
audio busses, the P bus, as well as the echo canceller bus reference and remote control
information (for other EF devices). It can link up to 8 Vortex devices.
The W, X, Y, Z Busses. The W, X, Y, and Z busses include NOM informa-
tion and can be used for sharing microphone inputs, or for sharing mono or stereo
program information. On the EF Bus page in Conference Composer, the inputs com-
ing in to each submatrix labelled WB0, WB1, ... WB7 correspond with the device ID
of the bus that is transmitting. The “B” denotes Bus. The submixes themselves,
denoted as WM0, WM1, and WM2 are mixes that are input into the main matrix. The
“M” denotes Mix.
The EF2211 and EF2210 can transmit and receive signals on the W, X, Y, and Z bus-
ses.
The P Bus. The P Bus is provided specifically to allow devices to share digital
phone audio from the phone hybrid devices (EF2241, EF2201, EF2211).
On the EF Bus page in Conference Composer, the inputs coming in to each submatrix
labelled PB0, PB1, ... PB7 correspond with the device ID of the bus that is transmit-
ting. The “B” denotes Bus. The submixes themselves, denoted as PM0, PM1, and
PM2 are mixes that are input into the main matrix. The “M” denotes Mix.
The EF2211 can both transmit and receive signals on the P bus. The EF2210 cannot
transmit but can receive signals on the P bus.
Crosspoint Mix Minus Bus. Each Vortex device in the system can create
up to 5 output mixes, depending on what signals they can transmit, and place them on
the bus. Each device also can create three input mixes from each of the input busses
of the other devices. The mixes allow crosspoint gains to be adjusted on the signals
THE EF BUS
VORTEX EF2211/EF2210 Reference Manual 24 Technical Support: 800.932.2774
from the other devices. See Figure 13 below. The input mixes become inputs to the
main matrix and can be mixed with the other inputs to create output mixes.
EF Bus Reference. In a system with multiple devices, if all devices need the
same echo canceller reference, one device should be designated to put its echo cancel-
ler reference on the EF bus to be used as the EF Bus Reference. All other devices
may use the EF bus reference as the reference for their echo cancellers, or they can
use their own internal references. The references may include a mix of any input,
with crosspoint gains, including W, X, Y, and Z busses.
NOM. The W, X, Y, and Z busses on the EF Bus contain NOM information. See
“NOM Active” on page 31 for more information on how NOM attenuation is applied.
4. Configure Your
Echo Canceller
Reference
Review what inputs need to be included in your echo canceller reference — See
“Build Your Echo Canceller Reference” on page 16. Remember that each micro-
phone needs to have an echo canceller reference. If all microphones are in the same
Figure 13. W, X, Y, and Z submatrices, the P submatrix, and Exported Bus Reference.
Note. The EF Bus must be connected so that the EF BUS OUT of one
Vortex device is connected to the EF B
US IN of another Vortex
device. Connecting EF B
US IN to another EF BUS IN (or EF BUS
O
UT to EF BUS OUT) will not work. See“Connector Pinouts”
on page 52 for pinout of Cat 5 cable.
THE EF BUS
© Polycom, Inc. 25 VORTEX EF2211/EF2210 Reference Manual
room and use the same reference, configure the echo canceller reference on one Vor-
tex device and assign it to the EF Bus as the EF Bus Reference. Only one Vortex
device out of multiple units linked together can put an echo canceller reference on the
EF Bus. For each additional unit, assign the echo canceller reference to use the EF
Bus Reference.
For systems with more than one room, you may need to use the W, X, Y, or Z sub-
busses to share the echo canceller reference in your additional rooms if the EF Bus
Reference has already been assigned to the EF Bus.
P
RESETS
After configuring your Vortex device, save your settings to a User Preset (PRESETS
16-47). Also, set the P
OWER ON PRESET to the User Preset you have saved to. The
P
OWER ON PRESET determines how the unit is configured upon power up.
If you have multiple Vortex devices in your system, save to a User Preset on each unit
and set the P
OWER ON PRESET accordingly.
O
THER
EF2211/EF2210 F
EATURES
For information on Macros, Logic Inputs (EF2211 only), Logic Outputs (EF2211
only), Input Filters and Output Filters, please refer to the Conference Composer User
Guide.
LCD MENU STRUCTURE
VORTEX EF2211/EF2210 Reference Manual 26 Technical Support: 800.932.2774
LCD M
ENU
S
TRUCTURE
LCD Menu Tree The EF2211/EF2210 LCD menu structure is made up of nine menu trees: SYSTEM,
P
HONE CONTROL (EF2211 only), INPUTS, OUTPUTS, AUTOMIXER, MATRIX, PARA-
METRIC EQ, PRESETS, and MACROS. Each menu tree is organized by levels and
branches into multiple subcategories. The branches end with an adjustable parameter
or value.
The EF2211/EF2210 has five menu buttons on the front panel for navigation in the
menu tree. Press the H
OME button from anywhere in the menu tree to return to the top
of the menu. The E
NTER button enters the menu and the ESC button returns to the
next highest level of menus. To scroll back through menu items at a particular level,
use the D
OWN button. To scroll forward through menu items at a particular level, use
the U
P button.
To adjust a parameter, first locate the parameter by scrolling to the appropriate menu
(with combinations of the U
P/DOWN and ENTER buttons). The display will show the
Figure 14. LCD Menu Tree.
D
OWN UP ENTER ESC HOME
Scrolls backward
through menu
items at particular
level or decreases
the value of a
parameter
Scrolls forward
through menu
items at particular
level or increases
the value of a
parameter.
Enters the menu
and allows you to
select and change
parameter values.
Returns to the top
of the next high-
est level of menus
Returns to the top
of the menu struc-
ture.
Table 2: Summary of button functions on the EF2211/EF2210.
EF2211 System
Settings
Automixer
Mixer Settings
(AM1)
Global Settings
Channel Settings
(Input 1)
Decay
Hold Time
Bus ID
Chairman Mic
Last Mic On Mode
Chairman Mode
Local Max NOM
Global Max NOM
Last Mic Number
Off Attenuation
Threshold Type
Adaptive Threshold
Manual Threshold
Gating Mode
Gate Priority
Camera Gating
Threshold
Phone Control
Auto Answer
Auto Hangup
Loop Drop
Country Select
Auto Hangup
Call Progress
DTMF Gain
Ring Tone Enable
Dial Tone Gain
System
Power On Preset
Bus Reference
Error Messages
Acknowledgement
Mode
Front Panel Password
Device ID
Front Panel Lock
Non-Volatile
Memory Lock
Non-Volatile Mem
Password
Meter
Last Restored Preset
Reboot Vortex
Screen Saver
Baud Rate
Flow Control
Software Version
Inputs 1, T, A, B
Mute
Acoustic Echo
Cancellation (In 1)
Gain
AGC Maximum
(In 1, T)
Level Mic/Line
(In 1)
Automatic Gain Control
(AGC), In 1, T
Noise Cancellation
Level (In 1, T)
Phantom Power
(In 1)
Noise Cancellation
(In 1, T)
AEC Suppression
(In 1)
Reference Assign
(In 1)
AGC Minimum
(In 1, T)
LEC Suppression
(In T)
Dynamics Processing
(In T)
Line Echo Cancellation
(In T)
Outputs
Mute Output
NOM Attenuation
On/Off
Output Gain
Output Delay Enable
Output Delay
Dynamics Processing
(Out T)
Matrix
Gain
Gate (In 1)
Mute
Main Matrix
Gain
Mute
SubMatrix
Parametric EQ
Frequency
Filter Type
Bandwidth
Slope
Gain
Filter Enable
Input/Output EQ
Band
Channel
Presets
Save
Presets 16-47
Delete
Presets 16-47
Restore
Macros
Run Macro (0-255)
Automixer Reference
Reference Bias
LCD MENU STRUCTURE
© Polycom, Inc. 27 VORTEX EF2211/EF2210 Reference Manual
parameter field and the parameter value. To change the parameter, the parameter
must be flashing. To make the parameter flash (assuming the front panel is not
locked) press E
NTER. Once the parameter is flashing, use the UP and DOWN buttons
to adjust the parameter value. The parameter is instantly updated while it is being
adjusted — you should hear changes as the parameter is changing. RS-232 control
strings are also sent via the RS-232 port so your remote control device is instanta-
neously updated as well. Press E
NTER to select and store the parameter value or press
E
SC to cancel the selected value and return to the old value. Pressing HOME has the
effect of pressing E
SC then HOME, so the selected value will be cancelled and the
menu will return to the top of the menu tree.
Parameters that toggle or select among a list of options will wrap around when you
reach the end, but parameters that adjust numeric values will not wrap around once
the maximum or minimum value is reached. While adjusting a parameter, the U
P/
D
OWN button must be held down briefly before the repeat rate increases.
LCD MENU STRUCTURE
VORTEX EF2211/EF2210 Reference Manual 28 Technical Support: 800.932.2774
S
YSTEM
M
ENU
The SYSTEM menu contains POWER ON PRESET, ACKNOWLEDGEMENT MODE, BUS
R
EFERENCE, ERROR MESSAGES, FRONT PANEL LOCK, FRONT PANEL PASSWORD,
D
EVICE ID, BAUD RATE, FLOW CONTROL, LCD CONTRAST, METER, NON-VOLATILE
M
EMORY LOCK, NON-VOLATILE MEMORY PASSWORD, SCREEN SAVER, SOFTWARE
V
ERSION, and REBOOT EF2211/EF2210 configurations.
Power On Preset. Choose the EF2211/EF2210 Preset for power up.
Acknowledgement Mode. This command controls whether or not status
messages are sent.
EF Bus Reference. This designates which EF2211/EF2210 device, when
multiple devices are linked together, will put one of their echo canceller references on
the EF bus to be used as the EF bus reference.
Error Messages. Turns error messages On or Off.
Front Panel Lock. Locks or unlocks the front panel. When the front panel is
locked, you can see the parameters but you cannot change them.
The default passcode is aspi (case is important).
Front Panel Passcode. Once the device has been unlocked, the passcode
may be changed. At the F
RONT PANEL PASSCODE menu, press ENTER and then enter
a passcode and press E
NTER until you reach the end of the screen.
Device ID. Selects the Device ID of the unit.
Baud Rate. Selects baud rate of the RS-232.
Flow Control. Selects flow control between Hardware, None, or Auto.
Meter. Selects which signal is displayed on the front panel LED meter.
Non-Volatile Memory Lock. Controls the non-volatile lock feature.
When the non-volatile memory is locked, you can query the settings but will get an
error if you try to change them.
Non-Volatile Memory Password. This feature sets or queries the non-
volatile lock password. This password is used in conjunction with N
ON-VOLATILE
M
EMORY LOCK. The default password is aspi (case is important).
Screen Saver. Enables or disables the screen saver on the LCD panel. You can
also set the idle time.
Last Restored Preset. Displays the last restored Preset.
Software Version. Queries the software version.
Reboot EF2211/EF2210. Cycles power on the EF2211/EF2210.
Figure 15. EF2211/
EF2210 System sub-
menu
System
Power On Preset
Bus Reference
Error Messages
Acknowledgement
Mode
Front Panel Password
Device ID
Front Panel Lock
Non-Volatile
Memory Lock
Non-Volatile Mem
Password
Meter
Last Restored Preset
Reboot Vortex
Screen Saver
Baud Rate
Flow Control
Software Version
LCD MENU STRUCTURE
© Polycom, Inc. 29 VORTEX EF2211/EF2210 Reference Manual
P
HONE
C
ONTROL
(EF2211 O
NLY
)
Auto Answer. Enables or disables auto answer.
Auto Hangup Call Progress. Enables or disables auto hangup based on
call progress messages.
Auto Hangup Loop Drop. Enables or disables auto hangup cased on loop
drop.
Country Select. Selects the country where you are using the unit. This must
be set before you can use the unit and does not need to be set again unless you use the
unit in a different country.
Dial Tone Gain. Adjusts the gain of the dial tone.
DTMF Gain. Adjusts the gain of the DTMF tones.
Ring Tone Enable. Enables or disables ring tones.
Figure 16. EF2211/
EF2210 Phone Con-
trol submenu
Phone Control
Auto Answer
Auto Hangup
Loop Drop
Country Select
Auto Hangup
Call Progress
DTMF Gain
Ring Tone Enable
Dial Tone Gain
LCD MENU STRUCTURE
VORTEX EF2211/EF2210 Reference Manual 30 Technical Support: 800.932.2774
I
NPUTS
The input menu allows the user to adjust functions related to the input signals to the
EF2211/EF2210. This menu contains A
COUSTIC ECHO CANCELLATION, AUTOMATIC
G
AIN CONTROL, AGC MAXIMUM, AGC MINIMUM, GAIN ADJUST, LEVEL MIC/LINE,
M
UTE, NOISE CANCELLATION, NOISE CANCELLATION LEVEL, PHANTOM POWER,
R
EFERENCE ASSIGN, and AEC SUPPRESSION. The menu is organized around the
Inputs (1, T, A and B), so that you first select an input and then select settings for that
input.
NOTE: Input T is the incoming phone signal. This input is only available on the
EF2211.
Acoustic Echo Cancellation. This allows you to enable or disable the
acoustic echo canceller on channel 1. The default is On.
Automatic Gain Control (Inputs 1, T). This enables automatic gain
control (AGC) on Input 1 and T. The default is On.
AGC Max (Inputs 1, T). Sets the maximum gain value that the AGC can
apply for Inputs 1 and T.
AGC Min (Inputs 1, T). Sets the minimum gain value that the AGC can
apply for Inputs 1 and T.
Gain. This parameter adjusts the gain level of the inputs. This is normally config-
ured during the calibration process. The default setting is 15 dB for microphone
signals and 0 dBu for line level signals.
Level (Input 1). Use this parameter to select mic or line level on Input 1.
Mute. This selects which input channel (1, T, A, B) is muted. The default is not
muted.
Noise Cancellation (Inputs 1, T). This allows you to enable or disable
noise cancellation.
Noise Cancellation Level (Inputs 1, T). Selects the level of noise
cancellation. This ranges from 0 to 15 dB. The default is 10 dB.
Phantom Power (Input 1). Use this parameter to turn phantom power
On or Off for input 1.
Echo Canceller Reference (Input 1). This parameter decides which
reference is associated with the input. Choose between R
EF1 or the external bus ref-
erence.
AEC Suppression (Input 1). Sets the amount of double talk suppression
used in the AEC. The values correspond to the following settings: 1 = No Suppres-
sion, 2 = Light Suppression, 3 = Heavy Suppression, 4 = Half-Duplex.
Line Echo Cancellation (Input T). Enables or disables the echo can-
cellation on the phone line.
Dynamics Processing (Input T). Enables or disables compression on
Input T.
Figure 17. EF2211/
EF2210 Inputs sub-
menu
Inputs 1, T, A, B
Mute
Acoustic Echo
Cancellation (In 1)
Gain
AGC Maximum
(In 1, T)
Level Mic/Line
(In 1)
Automatic Gain Control
(AGC), In 1, T
Noise Cancellation
Level (In 1, T)
Phantom Power
(In 1)
Noise Cancellation
(In 1, T)
AEC Suppression
(In 1)
Reference Assign
(In 1)
AGC Minimum
(In 1, T)
LEC Suppression
(In T)
Dynamics Processing
(In T)
Line Echo Cancellation
(In T)
LCD MENU STRUCTURE
© Polycom, Inc. 31 VORTEX EF2211/EF2210 Reference Manual
LEC Suppression (Input T). Sets the amount of suppression used the line
echo canceller (LEC).
O
UTPUTS
The OUTPUT menu contains GAIN, NOM ACTIVE, and MUTE. As with the INPUT
menus, this is done on a per channel basis.
NOTE: Output T is the outgoing phone signal. This output is only available on the
EF2211.
Output Gain. Choose the gain applied to each output signal using this parame-
ter. The default setting is 0 dBu. Though the EF2211/EF2210 allows for positive
output gain, you should always try to adjust input gains to a good level so that the out-
put gain is 0 dB. If you find that you need a positive output gain from the EF2211/
EF2210, first check your input gain to make sure you are getting a good level (around
0dB). Keep the output gain at around 0 dBu. Then, for the best gain structure, use
your amplifier to raise the volume in your system.
Mute Output. Use this to mute or unmute each Output.
NOM Active. This allows you to select whether the NOM attenuator is active for
a particular output channel (Outputs 1, A, B, T). The NOM attenuator will attenuate
the output signal by 10*log
10
(NOM) where NOM is the number of open microphones
in that particular output channel. NOM is calculated based on the number of open
microphones for each signal that is in the output.
Output Delay Enable. This allows you to enable delay to each of the out-
puts.
Output Delay. Sets the amount of delay on the output. The default value is 0
ms. The range is 0 to 340.0 ms in 0.1 ms increments.
Dynamics Processing (Output T). Enables or disables compression
on Output T.
Figure 18. EF2211/
EF2210 Outputs sub-
menu
Outputs
Mute Output
NOM Attenuation
On/Off
Output Gain
Output Delay Enable
Output Delay
Dynamics Processing
(Out T)
LCD MENU STRUCTURE
VORTEX EF2211/EF2210 Reference Manual 32 Technical Support: 800.932.2774
A
UTOMIXER
M
ENU
These parameters configure how the Vortex automatic microphone mixer oper-
ates. Parameters include the following: D
ECAY TIME, HOLD TIME, CAMERA
G
ATING THRESHOLD, BUS ID, CHAIRMAN MODE, CHAIRMAN MIC, LAST MIC ON
M
ODE, LAST MIC NUMBER, LOCAL MAX NOM, GLOBAL MAX NOM, OFF
A
TTENUATION, AUTOMIXER, THRESHOLD TYPE, GATING MODE, ADAPTIVE
T
HRESHOLD, MANUAL THRESHOLD, and GATE PRIORITY.
Global Settings.
Decay Time. Decay time is the amount of time the microphone audio takes to
ramp down to the Off Attenuation level after Hold Time. Decay Time values
range from 0 to 5000 msec. The default value is 1000 msec.
Hold Time. This is the amount of time the microphone stays On after the
energy in the channel drops below the gating threshold. The default value is 500
msec. The range is 1 to 5000 msec. Microphone channels gating On and Off too
frequently during short pauses in speech might be the result of setting the Hold
Time too low while too many microphones gating on at the same time may be the
result of Hold Time values that are too high.
Camera Gating Threshold. Specifies the hold time for camera gating infor-
mation.
Figure 19. EF2211/
EF2210 Automixer
submenu
Automixer
Mixer Settings
Global Settings
Channel Settings
Figure 20. Automixer parameters.
Ambient Level
ADAPTIVE THRESHOLD
Channel OFF
Channel ON
Channel turns on when
signal level is above
Adaptive Threshold
Microphone
Audio
Time
Signal Level
HOLD
T
IME
OFF ATTENUATION
DECAY
T
IME
Global Settings
Decay
Hold Time
Camera Gating
Threshold
Automixer
LCD MENU STRUCTURE
© Polycom, Inc. 33 VORTEX EF2211/EF2210 Reference Manual
Mixer Settings.
Bus Mixer. This command is used to assign one of the two internal automixers
to one of the EF Bus automixer groups. Setting the Bus Mixer to the same num-
ber as the automixer on another Vortex device will allow the devices to be one
large automixer. Setting Bus Mixer to 0 means that the automixer is not grouped
on the EF Bus and the automixers operate independently.
Chairman Mode. Enables or disables Chairman Mode for the automixer.
Chairman Mic. Sets the Chairman Microphone for the automixer.
Last Mic On Mode. Sets “Last Mic On” mode for the automixer.
Last Mic Number. Sets the microphone number that will remain on when
“Last Mic On” mode is set to manual. Setting this value to 0 will cause the auto-
mixer to leave the last open microphone on. The last microphone number is
specified for the automixer, but is only used in manual “Last Mic On” mode.
Local Max NOM. Sets the maximum number of open microphones (NOM)
limit for the automixer. This NOM limit is a “local” limit, meaning that this limit
applies only to the specific Vortex device that it is set on.
Global Max NOM. Sets the global maximum number of open microphones
(NOM) limit for each linked automixer. The maximum value for this command
is 64. This NOM limit is a “global” limit, meaning that this limit applies to all
linked automixers with the same Bus ID.
Off Attenuation. Sets the Off Attenuation (in dB) for the automixer. Setting
this value to 18 would result in the microphone signals being attenuated by 18 dB
when gated off. This value is set independently for the automixer.
Automixer Reference. When enabled, the echo canceller reference becomes
a muted input in the automix so that far end audio coming from the speakers does
not gate on local microphones.
Reference Bias. Adjusts how much gain is applied to the Automixer Refer-
ence signal. The higher the gain, the harder it will for local talkers to gate on a
microphone.
Channel Settings.
Automixer. This allows you to select between Mixer 1 or no automixer for the
microphone channel input 1.
Threshold Type. Sets adaptive or manual automatic gating thresholds per
input.
Gating Mode. Sets the automixer gating control mode for input channel 1.
The possible modes are Normal Gating, Microphone Forced On, or Microphone
Forced Off.
Adaptive Threshold. This allows you to determine when to gate a micro-
phone on based on an estimate of the background noise level. The default value
is to gate a channel on if it is more than 10 dB louder than the background noise
level. Values range from 0 to 100 dB. To set the adaptive threshold, scroll
through the adaptive threshold range and select the desired adaptive threshold by
pressing E
NTER.
Manual Threshold. Sets the automixer gating threshold for input channel 1.
This value is only used if the input set to Manual Gating via the T
HRESHOLD
T
YPE option.
Gate Priority. The priority of each microphone can be assigned a value rang-
ing from 1 to 4. Priority 1 microphones have priority over priority 4 micro-
phones for gating. The default is to have all microphones set to priority 1. If
Chairman Mode is enabled, all microphones including ones with priority of 1
will be gated off when the Chairman mic gates on.
Mixer Settings
(AM1)
Bus ID
Chairman Mic
Last Mic On Mode
Chairman Mode
Local Max NOM
Global Max NOM
Last Mic Number
Off Attenuation
Automixer
Automixer Reference
Reference Bias
Automixer
Channel Settings
(Inputs 1)
Automixer
Gating Mode
Adaptive Threshold
Threshold Type
Gate Priority
Manual Threshold
LCD MENU STRUCTURE
VORTEX EF2211/EF2210 Reference Manual 34 Technical Support: 800.932.2774
M
ATRIX
M
ENU
The MATRIX contains commands for assigning input signals to output signals with
appropriate gains applied or mutes applied. It also allows for Gating to be turned on
for Input 1. This menu can apply gains to both the M
AIN MATRIX and the SUBMA-
TRIX.
Crosspoint Gains. Assign input signals to output signals with appropriate
gains applied.
Gate. Applies gating from Input 1 to an Output.
Mute. Applies mute to the crosspoint.
Figure 21. EF2211/
EF2210 Matrix sub-
menu
Matrix
Gain
Gate (In 1)
Mute
Main Matrix
Gain
Mute
SubMatrix
LCD MENU STRUCTURE
© Polycom, Inc. 35 VORTEX EF2211/EF2210 Reference Manual
P
ARAMETRIC
EQ M
ENU
The input equalizer is comprised of up to 5 bands of filtering. The whole group of fil-
ters for the channel can also be enabled/disabled without losing the settings for each
band. For each band, you first select the type of filter from the following: Parametric/
Peaking, High Shelf, Low Shelf, Lowpass, Highpass, Linkwitz-Riley Low, or Link-
witz-Riley High.
Parametric/Peaking.
• Center Frequency: in Hz, between 20 Hz and 20,000 Hz in 1 Hz steps.
• Bandwidth: in octaves, between 0.05 and 2 octaves in 0.05 octave steps.
• Gain: in dB, between -20 and +20 in 1 dB steps.
High Shelf.
• Center Frequency: in Hz, between 20 Hz and 20,000 Hz in 1 Hz steps.
• Bandwidth: in dB/octave, between 1 and 24 dB/octave, but is always less
than or equal to 1.2 x Gain.
• Gain: in dB between -20 and +20 in 1 dB steps.
Low Shelf.
• Center Frequency: in Hz, between 20 Hz and 20,000 Hz in 1 Hz steps.
• Bandwidth: in dB/octave, between 1 and 24 dB/octave, but is always less
than or equal to 1.2 x Gain.
• Gain: in dB between -20 and +20 in 1 dB steps.
Lowpass.
• Cutoff Frequency: in Hz, between 20 Hz and 20,000 Hz in 1 Hz steps.
Highpass.
• Cutoff Frequency: in Hz, between 20 Hz and 20,000 Hz in 1 Hz steps.
Linkwitz-Riley Low. •Frequency: in Hz, between 20 Hz and 20,000 Hz in 1
Hz steps
• Slope between 24 dB/oct and 12 dB/oct
Linkwitz-Riley High. •Frequency: in Hz, between 20 Hz and 20,000 Hz in 1
Hz steps
• Slope between 24 dB/oct and 12 dB/oct
Center frequency on Parametric/Peaking is the point with the most (or least) gain.
Bandwidth is the width halfway up the peak (so if the peak is 10 dB, it is the width
between the points where the gain is 5 dB).
Center frequency on shelving filters is the frequency where it crosses the point half-
way between 0 dB and the gain of the filter, halfway up the slope.
Figure 22. EF2211/
EF2210 Parametric
EQ submenu
Parametric EQ
Frequency
Filter Type
Bandwidth
Slope
Gain
Filter Enable
Input/Output EQ
Band
Channel
LCD MENU STRUCTURE
VORTEX EF2211/EF2210 Reference Manual 36 Technical Support: 800.932.2774
P
RESETS
Restore. Restores the selected preset.
Save. Saves the selected user preset (Presets 16-47). Factory presets (Preset 0-15)
cannot be overwritten.
Delete. Deletes the selected user preset (Presets 16-47). Factory Presets (Presets
0-15) cannot be deleted.
M
ACROS
Run Macro (0-255). Allows you to run macros from the front panel menu.
Figure 23. EF2211/
EF2210 Presets sub-
menu
Presets
Save
Presets 16-47
Delete
Presets 16-47
Restore
Figure 24. EF2211/
EF2210 Macros sub-
menu
Macros
Run Macro (0-255)
TROUBLESHOOTING
© Polycom, Inc. 37 VORTEX EF2211/EF2210 Reference Manual
T
ROUBLESHOOTING
A
UTOMATIC
M
ICROPHONE
M
IXER
The microphone
is not gating
• Check if the microphone is assigned to an automixer.
• Check if the microphone is muted.
• Check microphone level. Is the microphone set to the appropriate mic or line
level? Is phantom power on where needed?
• The Hold Time may be too low. Microphone channel gating On and Off too fre-
quently during short pauses in speech might be the result of setting the Hold
Time too low.
• Check Gating settings. Is the microphone Forced Off?
• Check Gating Priority. If your input has a Gating Priority of 4, the microphone
may not gate as frequently.
• Adjust the Adaptive Threshold if the Gate Threshold is set to Adaptive or adjust
the Manual Threshold if the Gate Threshold is set to Manual. For Adaptive Gate
Threshold, set the Adaptive Threshold lower so that the microphone will gate On
when lower level signals are present at the microphone. For Manual Gate
Threshold, set the Manual Threshold to a lower absolute threshold.
M
ATRIX
M
IXER
Don’t hear output • Make sure the output is not muted.
• Check that the input you’re expecting to hear is included in the output that you’re
listening to.
E
CHO
C
ANCELLER
R
EFERENCE
Room Audio
Sounds Choppy
If you hear the local room’s audio from the loudspeakers and it sounds choppy, you
may have included the room’s microphones in the echo canceller reference. The echo
canceller reference should NOT include the local room’s microphones -- it should
only contain the remote end’s audio and program audio. You can still add the local
room’s microphones to the local output with the matrix, but do not add them to the
echo canceller reference. For more specific guidelines on what to include in your
echo canceller reference, see “Build Your Echo Canceller Reference” on page 16.
R
ESIDUAL
E
CHO
You may hear residual echo if system levels are not set properly. Improper level set-
tings anywhere in the audio path can introduce nonlinearities that hamper the opera-
TROUBLESHOOTING
VORTEX EF2211/EF2210 Reference Manual 38 Technical Support: 800.932.2774
tion of the EF2211/EF2210. If you hear residual echo, one of the following
conditions may be causing the problem.
Reverberation vs.
Acoustic Echo
Do not confuse the residual echo of remote speech with the reverberation of local
speech. Reverberation of local speech is caused when the speech signal arrives at the
microphone via several paths (the direct path and multiple reflections from surfaces in
the room). This is a local room phenomenon that gives the talker’s voice a hollow or
resonant sound (as heard at the remote end).
Reverberation is not an artifact of the echo canceller. It is mainly affected by the dis-
tance of the microphone from the speech source and by the resonances of the room.
While reverberation can be unpleasant, it is not compensated for by the acoustic echo
canceller (AEC), which only removes reflections of remote speech. If the remote end
complains that they hear echo, ensure that they are referring to hearing their own
voice and not echoes of local talkers.
You cannot remove the effects of reverberation by changing the EF2211/EF2210’s
settings, but you can minimize reverberation by moving microphones closer to talkers
and, if necessary, adding acoustical treatment to the room.
Finding the
Source of Echo
Try muting one channel at a time to see if the echo that the remote end is hearing goes
away when a particular channel is muted. If you find that the echo goes away when a
particular channel is muted, the microphone may not be calibrated correctly. Check
one or more of the following issues.
Room Gain The most common cause of poor echo cancellation performance is incorrectly
adjusted room gain. This may be explained as follows. The reference signal seen by
the AEC is sent to a loudspeaker output, where it is amplified and sent to the room
Figure 25. Reverberation vs. Acoustic Echo.
AEC
Reverberation
Acoustic Echo
TROUBLESHOOTING
© Polycom, Inc. 39 VORTEX EF2211/EF2210 Reference Manual
loudspeakers. The loudspeaker audio is coupled into the room microphones acousti-
cally, through direct and reflected acoustic paths, and perhaps also through mechani-
cal coupling. The microphone signal is then amplified and sent to the AEC as the
local microphone input signal. The room gain of a microphone channel refers to the
relative levels of the signal sent to the loudspeaker output (before any amplification)
and the level of this signal that is reflected as the microphone input (after microphone
amplification).
If the electrical level of the reflected signal picked up by microphone is the same as
the level of the electrical signal sent from the AEC to the loudspeaker output, the
room gain of this microphone channel is said to be 0 dB. If the reflected signal picked
up by the microphone is higher than the level of the signal sent to the loudspeaker out-
put, that microphone channel has positive room gain. The more positive the room
gain, the harder the AEC must work to determine which signal is an echo and which
is a local speech signal.
Excessive Room
Gain
Excessive room gain can be caused through a number of mechanisms:
1. The most common is excessive amplification of the remote (reference) signal at
the local loudspeaker output. This may be explained as follows. If the reference
signal is too low coming into the EF2211/EF2210, i.e. the codec audio signal is
too low, the room audio amplifier is usually used to compensate and bring the
room audio to an acceptable level. For example, if the reference signal is 12 dB
too low, the room audio will need to be amplified by approximately 12 dB to
bring it to a reasonable listening level. This adds 12 dB to the room gain, which
will most likely cause it to exceed the amplifier room gain limit (See “Verify
Room Gain” on page 12). This situation can be remedied by applying enough
gain to the codec, phone or program audio inputs (Inputs A-B) which will make
up the Reference input signal so that the acoustic echo canceller (AEC) sees a
good reference signal rather than trying to compensate at the amplifier.
2. Another common cause of room gain failure is excessive microphone amplifica-
tion. For example, if a microphone is "hot" by 6 dB, then the reflections of the
loudspeaker output signal which are picked up by the microphone will be ampli-
Figure 26. Room Gain.
AEC
A
B
Room Gain = 20 log (B/A)
TROUBLESHOOTING
VORTEX EF2211/EF2210 Reference Manual 40 Technical Support: 800.932.2774
fied by 6 dB more than necessary. This adds 6 dB to the room gain, which may
be sufficient to cause room gain problems. This situation could easily arise if, for
example, the conferencing equipment is set up so that participants are too far
from the microphone. In such a situation, after correct microphone setup the
local microphone audio level may be too low because of the distance from the
talker to the microphone. The microphone audio will most likely also be muddy
and reverberant. The installer or user may try to solve these microphone audio
quality problems by turning up the microphone amplification, thus adding to the
room gain. This problem can be remedied by proper microphone selection
(pickup pattern, directionality) and placement, coupled with proper microphone
input calibration.
3. A third common cause of room gain problems is excessive coupling between
loudspeaker audio and microphones. This can be addressed by reducing the
microphone coupling, either by positioning microphones so that their pickup pat-
terns are biased away from the loudspeaker audio (and direct reflections of loud-
speaker audio), repositioning loudspeakers, or reducing the loudspeaker
amplification.
In summary, any amplification applied between the reference input and the micro-
phone input can add to room gain problems. To avoid problems, ensure that the Ref-
erence input signal is not too low, and the microphone input signals are not too high.
Run the built-in EF2211/EF2210 Room Gain test to verify that you do not have room
gain problems (See “Verify Room Gain” on page 12).
In-Conference
Quick Check
If you experience residual echo problems during a conference, you can quickly check
that the reference and microphone levels are calibrated and not causing room gain
problems by using the Room Gain parameter (See “Verify Room Gain” on page 12).
If this excessive coupling activity level is evident on only one microphone input chan-
nel, that microphone channel should either be redirected to reduce coupling to loud-
speaker audio, or recalibrated as it will need to be turned down. If the excessive
coupling activity is observed on all (or most) microphone channels, then this indicates
either that the room audio is too loud or the reference signal may need to be recali-
brated (this will be indicated by observing low activity levels on the S
IGNAL LEVEL
M
ETER).
C
OMMON CAUSES OF EXCESSIVE
R
OOM GAIN
REMEDY
Excessive remote (reference) input
amplification
Apply enough gain to the codec, phone
or program audio inputs which will
make up the Reference input signal.
Excessive microphone amplification Select proper microphones for talker
distance according to pickup pattern
and directionality and properly cali-
brate mic input.
Excessive coupling between loud-
speaker audio and microphones
Reduce mic coupling by repositioning
mics or loudspeakers, or by reducing
loudspeaker amplification.
Table 3: Summary of Excessive Room Gain.
TROUBLESHOOTING
© Polycom, Inc. 41 VORTEX EF2211/EF2210 Reference Manual
Excessive
Microphone
Amplification
For the EF2211/EF2210 to adapt effectively, saturation (overload or clipping) must
not occur at the A/D converter supplying the microphone input. Saturation introduces
nonlinear signal distortions into what the AEC expects is a linearly echoed version of
the remote speech.
Nonlinear distortion causes a degradation or divergence of the AEC’s internal model
of the room acoustics. In this situation, the EF2211/EF2210 cannot effectively cancel
room echoes and a substantial amount of echo may be heard by the remote party.
Excessive microphone amplification also increases room gain (See “Excessive Room
Gain” on page 39.). You can check for excessive microphone amplification by
observing the front panel L
EVEL INDICATOR during a normal conference. The first
yellow LED should illuminate frequently. If the second yellow LED is illuminated
constantly during normal speech or if the red LED illuminates or even flickers, reduce
the microphone input level.
Insufficient
Microphone
Amplification
Grossly insufficient microphone gain degrades EF2211/EF2210 performance and
weakens the out-bound speech power level. This has the effect of reducing the signal-
to-noise ratio of the microphone signal, which is analogous to raising the background
noise level in the room. Because this noise is uncorrelated with the echoes within the
room, the EF2211/EF2210’s ability to adapt and cancel echoes will be less than opti-
mal.
A second effect of insufficient microphone gain is that the power of the microphone
input signal may be substantially lower than that of the remote input signal. This
reduces the ability of the decision logic to determine whether the AEC should be in
transmit, receive, or double-talk mode. This effect may reduce the effectiveness of
the EF2211/EF2210 in canceling echoes.
You can check for insufficient microphone amplification by observing the front panel
L
EVEL INDICATOR during normal conferencing conversation. The first yellow LED
should illuminate frequently. If the L
EVEL INDICATOR never illuminates beyond one
or two green LEDs during normal speech, increase the microphone’s input level.
Nonlinearity Overdriving the loudspeaker or inserting a dynamics processor before the EF2211/
EF2210 may distort the signal that the microphones see causing ineffective AEC
operation. The EF2211/EF2210 relies on the linearity of the acoustic feedback path
Note. Before you readjust the microphone input levels, check to
make sure you are looking at the correct channel on the L
EVEL
I
NDICATOR.
Note. If you adjust the MIC/LINE INPUT level, you will affect the
room gain. Check to make sure that the room gain limit is not
exceeded. See “Verify Room Gain” on page 12.
Note. Before you readjust the microphone input levels, check to
make sure you are looking at the correct channel on the L
EVEL
I
NDICATOR.
Note. If you adjust the MIC/LINE INPUT level, you will affect the
room gain. Check to make sure that the room gain limit is not
exceeded. See “Room Gain” on page 38.
TROUBLESHOOTING
VORTEX EF2211/EF2210 Reference Manual 42 Technical Support: 800.932.2774
— D/A, amplifier, loudspeaker, microphone, and A/D — to cancel acoustic echoes.
If you overdrive the loudspeaker or insert a dynamics processor before the echo can-
celler, the acoustic reflections picked up by the microphone do not match the signal
fed to the loudspeaker. They are distorted copies of this signal. The EF2211/EF2210
cannot effectively cancel this distorted signal.
If you suspect the loudspeaker is introducing nonlinearities into the room acoustic
path, take these steps to minimize its influence on the echo canceller.
• Keep the loudspeaker’s volume level at less than three-eighths of full scale. If
higher volume is required, the EF2211/EF2210 should operate effectively at vol-
ume settings of up to 50 percent of full scale. At more than 50 percent, most
audio systems and loudspeakers introduce significant nonlinearities. The
EF2211/EF2210 may not adapt under these conditions, and echoes may be heard.
• If the loudspeaker has a bass control, lower it. Excessive bass can cause a boomy
effect that is nonlinear. In addition, excessive bass may cause substantial
mechanical coupling to the microphone through vibrations induced in the hous-
ings and support structures.
• Increase the separation distance between microphones and the loudspeaker. The
EF2211/EF2210 handles up to 10 dB of room gain between the loudspeaker and
the microphone. You may be exceeding this limit if the loudspeaker is pointed
directly at the microphones or if the loudspeaker volume is excessive (loud-
speaker placement is not critical, but it should not be pointed directly at the
microphones).
C
ONTACTING
T
ECHNICAL
S
UPPORT
If these troubleshooting guidelines don’t resolve the problem you are experiencing
with the EF2211/EF2210, please check our web site (http://www.polycom.com) for
the most current technical support information (go to Products & Services, then to
Voice Products, then to Installed Voice Systems). If you have further questions,
please contact us at:
Applications Engineering
Polycom Installed Voice Business Group
9040 Roswell Road
Atlanta, GA 30350
Phone: (800) 932-2774
Email: vortex@polycom.com
Before contacting us, please review the warranty and repair policy on page 56.
TECHNICAL SPECIFICATIONS
© Polycom, Inc. 43 VORTEX EF2211/EF2210 Reference Manual
T
ECHNICAL
S
PECIFICATIONS
MECHANICAL SPECIFICATIONS
Dimensions 19” (483 mm) W x 9.6” (244 mm) L x 1.75” (45 mm) H (full rack unit)
Weight 4 lb. (1.8 kg) dry
5.5 lb. (2.5 kg) shipping
Connectors Audio: Mini (3.5mm) quick connect terminal blocks
RS-232: DB9F
EF Bus In/Out: RJ45
Phone In/Out: RJ11
* Control/Status: DB25F
* Only applies to the EF2211.
E
LECTRICAL SPECIFICATIONS
Power 110 - 240 VAC; 47-63 Hz
Power Consumption 25 W
Phantom Power 24 V, software selectable
A
UDIO I/O
Microphone Input Level -30 dBu to 0 dBu/-66 dBu to -33 dBu, nominal; software selectable
Line Input Level -20 dBu to 0 dBu, nominal; software selectable
Line Output Level -20 dBu to 0 dBu, nominal; software selectable
Input Impedance >10 kOhms
Output Impedance 50 Ohms (drives 600 Ohms)
Headroom 20 dB, nominal
Loudspeaker Output, Power
Amplifier
10 W, 4-16 Ohms
P
ERFORMANCE SPECIFICATIONS
Frequency Response 20 Hz to 22 kHz
Acoustic Echo Cancellation Span 270 ms
Total Cancellation of AEC > 65 dB
Convergence Rate of AEC 40 dB/second
Line Echo Cancellation Span 32 ms
Total Cancellation of LEC > 65 dB
Convergence Rate of LEC 40 dB/second
Noise Cancellation 0 dB to 15 dB, software selectable
Control Inputs (EF2211 only) Contact closure
Status Outputs (EF2211 only) 5V, 20 mA each
TECHNICAL SPECIFICATIONS
VORTEX EF2211/EF2210 Reference Manual 44 Technical Support: 800.932.2774
C
OMPLIANCE
The Vortex EF2211/EF2210 complies with the ITU G.167 Recommendation for AEC,
FCC part 15, and CE requirements.
USA and Canada This device complies with part 15 of the FCC Rules. Operation is subject to the
following two conditions:
1. This device may not cause harmful interference, and
2. This device must accept any interference received, including interference that
may cause undesired operation.
NOTE This equipment has been tested and found to comply with the limits for a Class A dig-
ital device, pursuant to part 15 of the FCC Rules. These limits are designed to pro-
vide reasonable protection against harmful interference when the equipment is
operated in a commercial environment. This equipment generates, uses, and can radi-
ate radio frequency energy and, if not installed and used in accordance with the
instruction manual, may cause harmful interference to radio communications. Opera-
tion of this equipment in a residential area is likely to cause harmful interference in
which case the user will be required to correct the interference at his own expense.
In accordance with part 15 of the FCC rules, the user is cautioned that any changes or
modifications not expressly approved by Polycom Inc. could void the user’s authority
to operate the equipment.
This Class [A] digital apparatus complies with Canadian ICES-003.
Cet appareil numérique de la classe [A] est conforme à la norme NMB-003 du Can-
ada.
US Telco
requirements
(EF2211 only)
This equipment complies with part 68 of the FCC Rules. Please refer to the labeling
on equipment for the following information:
• Registration Number
• Ringer Equivalence
• Grantee's Name
• Model Number
• Serial Number and/or Date of Manufacture
• Country of Origin
If requested this information must be provided to the telephone company
Notes
• This registered equipment may not be used with party lines or coin lines.
• If trouble is experienced the customer shall disconnect the registered equipment
from the telephone line to determine if the registered equipment is malfunctioning
and that if the registered equipment is malfunctioning, the use of such equipment
shall be discontinued until the problem has been corrected.
TECHNICAL SPECIFICATIONS
© Polycom, Inc. 45 VORTEX EF2211/EF2210 Reference Manual
• If, in the unlikely event that this equipment causes harm to the network, the tele-
phone company will notify you in advance that temporary discontinuance of ser-
vice may be required. But if advance notice isn't practical, the telephone
company will notify you as soon as possible. Also, you will be advised of your
right to file a complaint with the FCC if you believe it necessary.
• The telephone company may make changes to its facilities, equipment, operations
or procedures that could affect the operation of the equipment. If this happens
the telephone company will provide advance notice so you can make the neces-
sary modifications to maintain uninterrupted service.
REN The REN is used to determine the quantity of devices that may be connected to the
telephone line. Excessive REN's on the telephone line may result in the devices not
ringing in response to an incoming call. Typically the sum of REN's should not
exceed five (5.0). To be certain of the number of devices that may be connected to a
line (as determined by the total REN's) contact the local telephone company.
Automatic Dialing WHEN PROGRAMMING EMERGENCY NUMBERS AND/OR MAKING TEST
CALLS TO EMERGENCY NUMBERS
1. Remain on the line and briefly explain to the dispatcher the reason for the call.
2. Perform such activities in the off-peak hours, such as early morning or late
evening.
Telco Connector A FCC compliant telephone cord and modular plug is provided with this equipment.
This equipment is designed to be connected to the telephone network or premises wir-
ing using a compatible modular jack that is Part 68 complaint. See the rest of these
installation instructions for details.
Canadian Telco
Requirements
(EF2211 only)
NOTICE: The Industry Canada label identifies certified equipment. This certification
means that the equipment meets telecommunications network protective, operational
and safety requirements as prescribed in the appropriate Terminal Equipment Techni-
cal Requirements document(s). The Department does not guarantee the equipment
will operate to the user's satisfaction.
Before installing this equipment, users should ensure that it is permissible to be con-
nected to the facilities of the local telecommunications company. The equipment must
also be installed using an acceptable method of connection. The customer should be
aware that compliance with the above conditions may not prevent degradation of ser-
vice in some situations. Repairs to certified equipment should be coordinated by a
representative designated by the supplier. Any repairs or alterations made by the user
to this equipment, or equipment malfunctions, may give the telecommunications
company cause to request the user to disconnect the equipment.
Users should ensure for their own protection that the electrical ground connections of
the power utility, telephone lines and internal metallic water pipe system, if present,
are connected together. This precaution may be particularly important in rural areas.
Caution: Users should not attempt to make such connections themselves, but should
contact the appropriate electric inspection authority, or electrician, as appropriate.
TECHNICAL SPECIFICATIONS
VORTEX EF2211/EF2210 Reference Manual 46 Technical Support: 800.932.2774
NOTICE: The Ringer Equivalence Number (REN) assigned to each relevant termi-
nal device provides an indication of the maximum number of terminals allowed to be
connected to a telephone interface. The termination on an interface may consist of
any combination of devices subject only to the requirement that the sum of the Ringer
Equivalence Numbers of all the devices does not exceed 5.
NOTE The term “IC:” before the certification/registration number only signifies that the
Industry Canada technical specifications were met.
CE Mark LVD and
EMC Directive
The EF2210 has been marked with the CE mark. This mark indicates compliance
with EEC Directives
89/336/EEC and 73/23/EEC. A full copy of the Declaration of Conformity can be
obtained from Polycom Ltd, 270 Bath Road, Slough, Berkshire, SL1 4DX, UK.
CE Mark R& TTE
Directive (EF2211
only)
This EF2211 has been marked with the CE mark. This mark indicates compliance
with EEC Directives 89/336/EEC, 73/23/EEC 1999/5/EC. A full copy of the Decla-
ration of Conformity can be obtained from Polycom Ltd, 270 Bath Road, Slough,
Berkshire, SL1 4DX, UK.
Declaration of Conformity:
Hereby, Polycom Ltd. declares that this EF2211 is in compliance with the essential
requirements and other relevant provisions of Directive
1999/5/EC.
Konformitetserklæring:
Hermed erklærer Polycom Ltd., at indestående EF2211 er i overensstemmelse med de
grundlæggende krav og de relevante punkter i direktiv 1999/5/EF.
Konformitätserklärung:
Hiermit erklärt Polycom Ltd., dass der EF2211 die grundlegenden Anforderungen
und sonstige maßgebliche Bestimmungen der Richtlinie 1999/5/EG erfüllt.
∆ήλωση Συµµόρφωσης:
∆ια του παρόντος, η εταιρεία Polycom Ltd. δηλώνει ότι η παρούσα συσκευή
(δροµολογητής) EF2211 πληροί τις βασικές απαιτήσεις και άλλες βασικές
προϋποθέσεις της Οδηγίας 1999/5/ΕK.
Vaatimustenmukaisuusvakuutus:
Polycom Ltd. vakuuttaa täten, että EF2211 on direktiivin 1999/5/EC keskeisten vaati-
musten ja sen muiden tätä koskevien säännösten mukainen.
Déclaration de conformité :
Par la présente, Polycom Ltd. déclare que ce EF2211 est conforme aux conditions
essentielles et à toute autre modalité pertinente de la Directive 1999/5/CE.
Dichiarazione di conformità:
TECHNICAL SPECIFICATIONS
© Polycom, Inc. 47 VORTEX EF2211/EF2210 Reference Manual
Con la presente Polycom Ltd. dichiara che il EF2211 soddisfa i requisiti essenziali e
le altre disposizioni pertinenti della direttiva 1999/5/CE.
Verklaring van overeenstemming:
Hierbij verklaart Polycom Ltd. dat diens EF2211 voldoet aan de basisvereisten en
andere relevante voorwaarden van EG-richtlijn 1999/5/EG.
Declaração de Conformidade:
Através da presente, a Polycom Ltd. declara que este EF2211 se encontra em confor-
midade com os requisitos essenciais e outras disposições relevantes da Directiva
1999/5/CE.
Declaración de conformidad:
Por la presente declaración, Polycom Ltd. declara que este EF2211 cumple los
requisitos esenciales y otras cláusulas importantes de la directiva 1999/5/CE.
Överensstämmelseförklaring:
Polycom Ltd. förklarar härmed att denna EF2211 överensstämmer med de väsentliga
kraven och övriga relevanta stadganden i direktiv 1999/5/EG.
Australia
(EF2211 only)
Mains powered POT’s Voice Telephony without Emergency 000 dialing
Warning
This equipment will be inoperable when
mains power fails
Rest of World
EMC CLASS A ITE
WAR NIN G
This is a Class A product. In a domestic environment this product may cause radio
interference in which case the user may be required to take adequate measures.
Installation Instructions*
Installation must be performed in accordance with all relevant national wiring rules.
TECHNICAL SPECIFICATIONS
VORTEX EF2211/EF2210 Reference Manual 48 Technical Support: 800.932.2774
L’Installation doit être exécutée conformément à tous les règlements nationaux appli-
cable au filage électrique.
Plug acts as Disconnect Device*
The socket outlet to which this apparatus is connected must be installed near the
equipment and must always be readily accessible
CONFERENCE SYSTEM DESIGN
© Polycom, Inc. 49 VORTEX EF2211/EF2210 Reference Manual
C
ONFERENCE
S
YSTEM
D
ESIGN
Good audio or video conferencing is more than acoustic echo cancellation. Before
installing the EF2211/EF2210, you should consider how your whole conference sys-
tem will work together. The goals of conference system design are the following:
• Transmit intelligible speech
• Reproduce received speech intelligibly
• Prevent echoes
• Interface properly with transmission equipment
• High quality program audio
• Intelligible sound reinforcement (if needed)
Noise and
Reverberation
Intelligibility can be affected by noise and reverberation. Noise comes from various
sources such as HVAC, computers, projectors, or traffic. Some ways to improve the
Signal to Noise Ratio (SNR) in your system include placing microphones closer to the
talkers, using electronic noise cancellation, and applying acoustical treatments. The
EF2211/EF2210 is a great way to reduce noise in your system and improve the SNR.
Polycom’s patent pending noise cancellation algorithm, included in the EF2211/
EF2210, removes up to 10 dB of ambient background noise and improves perceived
quality as well as intelligibility.
Reverberation in a conference system can reduce intelligibility in a room. To reduce
reverberation and increase intelligibility, use directional microphone and loudspeak-
ers, place microphones closer to the talker, and use acoustical treatment.
Consider Room
Gain
When planning your conferencing system, you should also consider the room gain
that will occur as a result of your microphone and loudspeaker placement. Room gain
refers to the relative level of the audio going to your amplifier (remote end speech or
telephone speech) and the level of this audio being picked up by the microphone. We
recommend a room gain of 0 dB or less for the best results. But for difficult acoustic
environments, the EF2211/EF2210, as well as any of the EF products, can handle up
to 10 dB room gain, which means that it offers great flexibility in your conference
system design.
To help you measure room gain, the EF2211/EF2210 includes a room gain detector.
You should check your room gain after you have set up the EF2211/EF2210.
Figure 27. Room Gain.
AEC
A
B
Room Gain = 20 log (B/A)
EF2211/EF2210 BLOCK DIAGRAM
VORTEX EF2211/EF2210 Reference Manual 50 Technical Support: 800.932.2774
EF2211/EF2210 B
LOCK
D
IAGRAM
EF2211
Figure 28. Inside the EF2211
RS-232
EF Bus
Control/Status
D/A
A/D
TLP
LEC
PEQ
Tone
Gen.
PEQ
Noise
Canceller
AGC
Parameters
On Off
Mute
On Off
Parameters
Parameters
TLP (Telephone Line Processing)
Echo
Canceller
Noise
Canceller
R1, R2, Bus
EN (Echo Canceller, Noise Canceller)
PEQ GateMute
Gated
Ungated
AGC
On OffOn OffOn Off
Parameters
Parameters
Call Prog
Detect
Phone
Telephone
Line
Matrixing
A/D
Level
adjust
+-
EN
Mic/Line
Phantom
A/D
Level
adjust
+-
PEQ
1B
Line
D/A
+-
B
PEQ
Line
D/A
+-
A
PEQ
A/D
Level
adjust
+-
PEQ
A
Line
D/A
+-
1
PEQ
+-
Amplifier
Output
AMP
EF2211/EF2210 BLOCK DIAGRAM
© Polycom, Inc. 51 VORTEX EF2211/EF2210 Reference Manual
EF2210
Figure 29. Inside the EF2210
RS-232
EF Bus
Matrixing
A/D
Level
adjust
+-
EN
Mic/Line
Phantom
Echo
Canceller
Noise
Canceller
R1, R2, Bus
EN (Echo Canceller, Noise Canceller)
PEQ GateMute
Gated
Ungated
AGC
On OffOn OffOn Off
Parameters
Parameters
A/D
Level
adjust
+-
PEQ
1B
Line
D/A
+-
B
PEQ
Line
D/A
+-
A
PEQ
A/D
Level
adjust
+-
PEQ
A
Line
D/A
+-
1
PEQ
+-
Amplifier
Output
AMP
CONNECTOR PINOUTS
VORTEX EF2211/EF2210 Reference Manual 52 Technical Support: 800.932.2774
C
ONNECTOR
P
INOUTS
EF Bus
The EF Bus uses RJ45 connectors. These should be
used with category five twisted-pair cable.
The total distance of the EF Bus should be less than
4.5 m.
The EF Bus must be connected so that the EF Bus In
of one box is connected to the EF Bus Out of
another. Connecting the EF Bus In to another EF
Bus In (or Out to Out) will not work.
Cat-5 Plug Pinout
1 - White/Orange
2 - Orange
3 - White/Green
4 - Blue
5 - White/Blue
6 - Green
7 - White/Brown
8 - Brown
RJ11 Plug Pinout
3 - Ring
4 - Tip
Note: Other pins are not connected. The DAA is not
affected by Tip and Ring wiring reversal.
RS-232 Port (9600, 19200, 38400, 8-N-1)
The RS-232 port is wired as DCE. It accepts a male
DB-9 connector. Only pins 2, 3, and 5 are required
by the EF2211/EF2210 but pins 7 and 8 are sup-
ported. Connect pins straight through (do not use
null modem).
1 DCD; 2 TXD; 3 RXD 4 DSR; 5 ground; 6 DTR; 7
CTS; 8 RTS; 9 No connection
Baud rate is selectable at 9600, 19200, or 38400.
EF BUS IN
EF BUS OUT
81
81
18
Cat 5 Plug
(Front View)
REMOTE CONTRO
L
REMOTE CONTRO
L
RS-232
15
69
CONNECTOR PINOUTS
© Polycom, Inc. 53 VORTEX EF2211/EF2210 Reference Manual
Note The information below lists manufacturer information for the 3.5 mm terminal block
connector that is compatible with the parts we use:
Manufacturer: Phoenix Contact
Description: Mini-COMBICON 3-position plug, 3.5 mm pitch
Type Number: MC 1.5/3-ST-3.5 or MC 1,5/3-ST-3,5
Part Number: 1840379
Input/Output Remote Control Port
Logic Input: Pins 1-24 are inputs 1-24, respec-
tively. Pin 25 is ground.
Logic Output: Pins 1-20 are outputs 1-20, respec-
tively. Pins 21-25 are ground. Each ground pin
should be used with only 4 outputs. For example,
outputs 1-4 could be connected to LEDs, which are
connected to ground pin 1.
LEDs can be used without series resistors (we have
provided series resistors in the circuitry). For best
results, LEDs with Vf=2.0 V and If=20 mA should
be used. Larger values may be used, but may result
in dimmer LEDs. An LED with Vf less than 1.4 V
should not be used without additional series resis-
tance.
Power Supply Input
The power supply input accepts a 5-pin DIN male
connector. Only use the power supply provided by
Polycom. Use of other power supplies will void the
warranty.
1 Ground; 2 Ground; 3 +5Vdc @ 3 A; 4 -15Vdc @
0.3 A; 5 +15Vdc @ 1.2 A
Mic/Line Input, Line Inputs, Line Outputs
These audio connectors accept a mini (3.5 mm) 3
conductor terminal block (provided). See Note
below for manufacturer information.
From left to right the conductors are positive signal,
negative signal, and shield ground.
113
25 14
INPUT
REMOTE CONTROL
OUTPUT
5, 15 VDC 5, 15 VDC
1
5
4
3
2
CONNECTOR PINOUTS
VORTEX EF2211/EF2210 Reference Manual 54 Technical Support: 800.932.2774
C
ONNECTING
U
NBALANCED
RCA
TO
B
ALANCED
T
ERMINAL
B
LOCK
1. Connect RCA Tip to terminal block pin 1.
2. Connect RCA Ring to terminal block pin 2.
3. Connect terminal block pin 3 to Shield, and leave Shield floating on RCA end.
M
AKING
AN
EF B
US
T
ERMINATOR
Instructions To make a terminator (for use when connecting EF2280s), use an RJ45 connector.
Connect pin 3 to pin 6 with an 110 Ohm resistor. A terminator is not required for the
EF2211/EF2210 as it is built in.
Figure 30. Cable construction for connecting unbalanced RCA to balanced 3-conductor terminal block.
Red
Black
Red
Black
Shield
Tip
Ring
RCA Male
3.5 mm Terminal Block
Connector
2
1
3
+
-
Caution! Do NOT connect the shield at both ends.
Caution! On the EF2211/EF2210, the terminal block pin 3
is connected to chassis ground. Under no cir-
cumstances should pin 3 be connected to pin 1
or to pin 2. Doing so will add noise to the audio
signal.
Figure 31. The terminator
12345678
110 Ω
CONNECTOR PINOUTS
© Polycom, Inc. 55 VORTEX EF2211/EF2210 Reference Manual
A
DDITIONAL
N
OTES
Caution! Failure to use all four screws to attach the EF2211/
EF2210 to the rack may result in uneven loading and
cause a safety hazard.
Caution! Ensure that the power supply is securely located such
that it cannot become dislodged and fall. Such a fall
could cause personal injury or equipment failure.
Caution! When mounting a EF2211/EF2210 in a rack, consider-
ation should be given to airflow and operating ambi-
ent temperatures inside the rack. To ensure safe
operation of the EF2211/EF2210, ambient operating
temperatures inside the rack should not exceed 40
degrees Celsius. Allow 2 inches (51mm) of open space
in front of the EF2211/EF2210, 2 inches (51mm) on
either side, and 4 inches (102 mm) behind the unit for
proper ventilation. Equipment should not be installed
in the rack in such a way as to interfere with the venti-
lation of the EF2211/EF2210.
Caution! Consideration should be given to the connection of
the equipment to the supply circuit and the effect that
overloading of circuits could have an overcurrent pro-
tection and supply wiring. Appropriate consideration
of equipment nameplate ratings should be used when
addressing this concern.
Caution! Reliable earthing of rack-mounted equipment should
be maintained. Particular attention should be given to
supply connections other than direct connection to
the Branch (use of power strips).
WARRANTY INFORMATION
VORTEX EF2211/EF2210 Reference Manual 56 Technical Support: 800.932.2774
W
ARRANTY
I
NFORMATION
What is covered Any defect in materials or workmanship.
For how long Two years.
What we will do If your Vortex EF2211/EF2210 product is defective and returned within two years of
the date of purchase, we will repair or, at our option, replace it at no charge to you.
If we repair your Vortex product, we may use new or reconditioned replacement parts.
If we choose to replace your Vortex product, we may replace it with a new or recondi-
tioned one of the same or similar design. The repair or replacement is warranted for
either (a) 90 days or (b) the remainder of the original two-year warranty period,
whichever is longer.
Limitations Polycom shall not be responsible for special, incidental, indirect, or consequential
damages resulting from any breach of warranty, or under any other legal theory,
including but not limited to loss of profits, downtime, goodwill, damage to or replace-
ment of equipment and property, and any cost of recovering, reprogramming, or
reproducing any program or data stored in or used with Vortex products.
Some states do not allow limitations on how long an implied warranty lasts, or the
exclusion of incidental or consequential damages, so the above exclusions or limita-
tions may not apply to you.
What we ask you
to do
To obtain warranty service for your Vortex product, call us at (800) 932-2774 and we
will issue a Return Material Authorization number (RMA#). Use the original packag-
ing materials to return the product. Ship the product prepaid to:
Polycom IVB Returns
Attention: Warranty Repair
RMA# (Must be on package)
9040 Roswell Road
Atlanta, GA 30350
Please be sure to include your name, company, address, phone number, and a descrip-
tion of the problem. After repairing or replacing your Vortex product, we will ship it
to you via a surface carrier of our choice at no cost to you. If you wish it shipped via a
specific carrier at your cost, you must arrange it when you obtain the RMA#.
Repair or replacement of your Vortex product is your exclusive remedy.
What this
warranty does
not cover
This warranty does not cover defects resulting from accidents, damage while in tran-
sit to our service location, alterations, unauthorized repair, failure to follow instruc-
tions, misuse, fire, flood, lightning, acts of God, or use in those countries where such
WARRANTY INFORMATION
© Polycom, Inc. 57 VORTEX EF2211/EF2210 Reference Manual
use violates Part 779 of the Export Administration Regulations of the United States
Department of Commerce.
If your Vortex product is not covered by our warranty, call us at (800) 932-2774 for
advice about whether we will repair your Vortex product and for other repair informa-
tion, including charges. Polycom, at its sole discretion, may replace rather than repair
your Vortex product with a new or reconditioned one of the same or similar design.
The repair or replacement is warranted for 90 days.
The limited warranties and remedies set forth above are exclusive and in lieu of all
other warranties, whether oral or written, express or implied. Polycom specifically
disclaims any and all implied warranties, including, without limitation, the warranties
of merchantability and fitness for a particular purpose.
No User
Serviceable Parts
This product contains no user serviceable parts. Please contact Polycom Installed
Voice Business Group for repairs. Attempts to repair this product by an unauthorized
technician will void your warranty.
State Law Rights This limited warranty gives you specific legal rights, and you any have other rights
that may vary from state to state.
DEFINITION OF TERMS
VORTEX EF2211/EF2210 Reference Manual 58 Technical Support: 800.932.2774
D
EFINITION
OF
T
ERMS
Acoustic Echo Acoustic echo occurs in a conferencing or distance learning system when the remote
speech played in the loudspeakers is picked up by microphones in the room and is
transmitted back to the remote end. This transmitted signal is a delayed version of the
original, which causes the echo.
Acoustic Gain Acoustic gain is a term used in conjunction with sound reinforcement. It refers to
how much louder the audio is with sound reinforcement compared to without sound
reinforcement.
Ambient Level The ambient level, also referred to as noise floor, is the background noise heard in a
room when no one on the near or remote end is talking.
Automatic Gain
Control (AGC)
Automatic gain control increases or decreases the gain on an audio signal to an
acceptable value.
Automatic
Microphone Mixer
A microphone mixer that turns microphone channels on and off based on the signal
level going into the microphone.
Convergence
Rate
Convergence rate refers to the amount of echo a line or acoustic echo canceller can
cancel per unit time, typically expressed in dB/sec. Better echo cancellers have a
higher (faster) convergence rate. This term is typically used to quantify the time it
takes to completely remove the echo from a conferencing system. Echo occurs due to
a complete change of the acoustic environment such as the beginning of a phone call
in a conference, a change of microphone-speaker placement, or speaker volume
adjustment.
Crosspoint Mix
Minus Bus
A mix minus bus allows each Vortex device to create a mix of signals without its own.
Each device in the system can create four mixes (W, X, Y, and Z) and place them on
the bus. Each device also can create three mixes each from the W, X, Y, and Z busses
of the other devices (for a total of 12 mixes). One mix is hardwired as a normal mix
minus. That is, it is a unity gain mix of the signals from all other devices. The other
two mixes can have crosspoint gains on the signals from the other devices.
Echo Canceller An echo canceller estimates the echo in an audio signal by using a reference and pre-
forms processing to eliminate the echo from the signal.
DEFINITION OF TERMS
© Polycom, Inc. 59 VORTEX EF2211/EF2210 Reference Manual
EF Bus The EF Bus is a digital bus that includes the W, X, Y, and Z audio busses as well as
the echo canceller reference and remote control information. It can be used to link
multiple Vortex devices.
Equalization Equalization is the process of adjusting frequency characteristics of an audio signal.
Line Echo Line echo is caused by reflections of the audio signal from the telephone hybrid. The
EF2211/EF2210 is an example of a device that includes a line echo canceller.
Macros An arbitrary set of commands that can be replayed.
Matrix Mixer A matrix mixer allows you to choose which inputs are included in each output. Some
matrix mixers allow you to assign crosspoint gains to the inputs.
Noise
Cancellation
Noise cancellation is a digital signal process that removes noise from an audio signal
corrupted by real-world interferences such as HVAC, office noise, crowd noise, or
road noise. Generally, there are two parts of a noise cancellation algorithm: a method
to detect the noise and a method to remove the noise. The Polycom noise cancellation
algorithm (patent pending) is capable of removing 10 dB or higher of noise with no
degradation at all to the resulting speech signal. This method does not attenuate
speech, and removes noise during both speech and idle periods.
NOM NOM refers to the number of open microphones in a system.
NOM Attenuation NOM attenuation is the gain applied to the overall system gain to the microphone sig-
nals to compensate for how many microphones are open. The amount of attenuation
is calculated by 10*log
10
(NOM).
NOM Bus A NOM bus carries signal information as well as NOM information (i.e., the number
of open microphones in the system, NOM).
Presets Presets correspond to configuration parameters that have been previously saved to
EEPROM.
Room Gain The room gain of a conferencing system refers to the relative levels of the signal sent
to the line output to your amplifier (before any amplification) and the level of this sig-
nal that is reflected at the microphone input (after microphone amplification). If the
electrical level of the reflected signal picked up by the microphone is the same as the
level of the electrical signal sent from the AEC to the line output to your amplifier, the
DEFINITION OF TERMS
VORTEX EF2211/EF2210 Reference Manual 60 Technical Support: 800.932.2774
room gain of this microphone channel is said to be 0 dB. If the reflected signal picked
up by the microphone is higher than the level of the signal sent to the line output to
your amplifier, that microphone channel has positive room gain. The more positive
the room gain, the harder the AEC must work to determine which signal is an echo
and which is a local speech signal.
INDEX
© Polycom, Inc. 61 VORTEX EF2211/EF2210 Reference Manual
INDEX
A
Acoustic Echo Cancellation, AEC ........................................................10, 16, 17, 30, 38, 39,
.................................................................................................................43, 49, 58
Automatic Gain Control (AGC) ............................................................30, 58
Automixer, Adaptive Threshold ..........................................................20, 33
Automixer, Adaptvie Threshold ..........................................................37
Automixer, Automatic Microphone Mixer ..........................................18, 20, 32, 37, 58
Automixer, Camera Gating Threshold ...............................................19, 32
Automixer, Chairman Mic Mode ..........................................................19, 20, 33
Automixer, Decay Time .......................................................................19, 32
Automixer, Gate Priority ......................................................................20, 33, 37
Automixer, Gating Mode ......................................................................20, 33
Automixer, Global Max NOM ...............................................................19, 33
Automixer, Hold Time ..........................................................................19, 32, 37
Automixer, Last Mic On .......................................................................19, 33
Automixer, Local Max NOM .................................................................19, 33
Automixer, Manual Threshold .............................................................20, 33, 37
Automixer, Off Attenuation .................................................................19, 33
Automixer, Off Atteunation .................................................................19
Automixer, Threshold Type .................................................................20, 33
B
Bus Mixer ...............................................................................................19, 21, 33
C
Calibration ..............................................................................................14
Compliance ............................................................................................44
Conference Composer ..........................................................................4, 12, 14, 17, 18, 21,
.................................................................................................................25
D
Device ID ...............................................................................................8, 10
Digital Bus ..............................................................................................23, 59
E
Echo Cancellation .................................................................................30
EF Bus .....................................................................................................4, 5, 8, 9, 16, 17, 19,
.................................................................................................................21, 22, 23, 24, 43, 52,
.................................................................................................................59
EF Bus Reference ..................................................................................24, 28
Equalization ...........................................................................................59
INDEX
VORTEX EF2211/EF2210 Reference Manual 62 Technical Support: 800.932.2774
F
Factory Default Settings, Preset 0 .....................................................9, 11, 14, 21
Front Panel Lock ...................................................................................28
G
Ground ....................................................................................................53
Ground, Chassis ....................................................................................54
Ground, Logic Input .............................................................................53
Ground, Logic Output ..........................................................................53
Ground, Power Supply .........................................................................53
Ground, RS-232 ....................................................................................52
Grounding, Pin 1 Compatible ..............................................................6
I
Inputs .....................................................................................................5, 6, 14
L
LCD Menu ..............................................................................................5, 14, 17, 26
Line Echo Cancellation, LEC ................................................................43
Line Echo Canceller, LEC .....................................................................59
Logic Input .............................................................................................5, 25, 53
Logic Output ..........................................................................................5, 25, 53
M
Matrix, Matrix Mixer ..............................................................................21, 34
Mic/Line Inputs, Line Inputs, Line Outputs ......................................53
Mix Minus ...............................................................................................23, 58
Multiple Vortex Devices .......................................................................8, 11, 17, 20, 21, 22,
.................................................................................................................24, 25, 59
N
Noise Cancellation ................................................................................30, 43, 49, 59
NOM ........................................................................................................23, 31, 59
NOM Attenuation ..................................................................................59
NOM Bus ................................................................................................24, 59
Non-volatile Memory Lock ...................................................................28
O
Outputs ...................................................................................................31
P
P Bus .......................................................................................................8, 16, 23
Parallel Remote Control .......................................................................5
Phantom Power .....................................................................................14, 30, 43
Phone ......................................................................................................5, 8, 16, 17, 23, 43, 59
Power Amplifier .....................................................................................5, 43
INDEX
© Polycom, Inc. 63 VORTEX EF2211/EF2210 Reference Manual
Power On Preset ...................................................................................11, 25
Presets ....................................................................................................59
R
Reference, AEC .....................................................................................16–17, 23, 30, 58, 59
Reverberation ........................................................................................49
Room Gain .............................................................................................12, 38, 59
RS-232, Serial Remote Control ...........................................................4, 5, 8, 14, 23, 27, 30,
.................................................................................................................43, 52
S
Submatrix ...............................................................................................21, 24, 34
T
Technical Support .................................................................................42
Terminal Block Connectors ..................................................................4, 8, 53
Terminating the EF Bus, Terminators ...............................................9, 54
V
Video Codec ...........................................................................................17, 22
Polycom, Inc.
Installed Voice Business Group
9040 Roswell Road Atlanta, GA 30350
Phone: (800) 932-2774
www.polycom.com
Technical Support:
(800) 932-2774
vortex@polycom.com
Polycom
®
, Vortex
®
, and the Polycom logo are registered trademarks of Polycom, Inc. in the United States
and various countries. Copyright © 2003 Polycom, Inc. All rights reserved.
P/N 1725-80103-001 Rev A
*1725-80103-001-A*
… 8 …

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