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DES-105/108
5/8-Port 10/100Mbps
Unmanaged Switch
Manual
RECYCLABLE
V2.00
ii
ABLE OF ONTENTST C
ABOUT T
IN
UNPAC
ID
CONNECTING THE SWITCH......................................................10
C
MOUNTING THE SWITCH ON A WALL...................................12
TECHNICAL SPECIFICATIONS .................................................13
RJ-45 PIN SPECIFICATION .........................................................15
HIS GUIDE .......................................................................1
PURPOSE.............................................................................................1
TRODUCTION ..............................................................................2
FAST ETHERNET TECHNOLOGY .........................................................2
SWITCHING TECHNOLOGY .................................................................2
802.1P AND QOS ................................................................................3
FEATURES ..........................................................................................4
KING AND SETUP ..............................................................6
UNPACKING........................................................................................6
SETUP.................................................................................................6
ENTIFYING EXTERNAL COMPONENTS ..............................7
FRONT PANEL ....................................................................................7
REAR PANEL ......................................................................................8
ONNECTING THE SWITCH......................................................10
PC TO DES-105/108.........................................................................10
HUB TO DES-105/108......................................................................10
DES-105/108 TO OTHER DEVICES....................................................10
PORT SPEED & DUPLEX MODE ........................................................11
1
ABOUT THIS GUIDE
Congratulations on your purchase of the D-Link DES-105/108. This
device integrates 100Mbps Fast Ethernet and 10Mbps Ethernet network
capabilities in one high-performance, easy-to-use solution.
Purpose
This manual will familiarize you with the DES-105/108 and guide you
through the installation process.
2
INTRODUCTION
Fast Ethernet Technology
The growing importance of LANs and the increasing complexity of
desktop computing applications are fueling the need for high performance
networks. 100BASE-T (Fast Ethernet) provides a cost-effective and high-
performance solution for small workgroups, SMBs (Small to Medium
Businesses), and any network supporting bandwidth-intensive applications.
Fast Ethernet technology operates at 10 times the speed of traditional
Ethernet, offering maximum performance and enhanced capability for
existing Ethernet-based networks.
100Mbps Fast Ethernet is a standard specified by the IEEE 802.3 LAN
committee. It is an extension of the 10Mbps Ethernet standard with the
ability to transmit and receive data at 100Mbps, while maintaining the
CSMA/CD Ethernet protocol. Since the 100Mbps Fast Ethernet is
compatible with all other 10Mbps Ethernet environments, it provides a
straightforward upgrade and takes advantage of the existing investment in
hardware, software, and personnel training.
Switching Technology
Switching is a cost-effective way of increasing the total network capacity
available to users on a LAN. If an Ethernet network begins to display
symptoms of congestion, low throughput, slow response times, and high
rates of collision, installing a switch to a network can preserve much or all
of the existing network's cabling and workstation interface card
infrastructure, while still greatly enhancing the throughput for users. A
switch is a viable solution even if demanding applications, such as
multimedia production and video conferencing, are on the horizon. The
most promising techniques, as well as the best return on investment, could
well consist of installing the right mixture of Ethernet switches.
A switch increases capacity and decreases network loading by dividing a
local area network into different LAN segments. Dividing a LAN into
3
multiple segments is one of the most common ways of increasing available
bandwidth. If segmented correctly, most network traffic will remain within
a single segment, enjoying the full-line speed bandwidth of that segment.
Switches provide full-line speed and dedicated bandwidth for all
connections. This is in contrast to hubs, which use the traditional shared
networking topology, where the connected nodes contend for the same
network bandwidth. When two switching nodes are communicating, they
are connected with a dedicated channel between them, so there is no
contention for network bandwidth with other nodes.
For Ethernet networks, a switch is an effective way of eliminating the
problem of chaining hubs beyond the “two-repeater limit.” A switch can
be used to split parts of the network into different collision domains,
making it possible to expand your Ethernet network beyond the 205-meter
network diameter limit for 100BASE-TX networks. Switches supporting
both 10Mbps Ethernet and 100Mbps Fast Ethernet are also ideal for
bridging between existing 10Mbps networks and newer 100Mbps
networks.
Switching LAN technology is a marked improvement over the previous
generation of network hubs and bridges, which were characterized by
higher latencies. Routers have also been used to segment local area
networks, but the cost of a router, the setup and maintenance required,
make routers relatively impractical. Today switches are an ideal solution
to most kinds of local area network congestion problems.
802.1p and QoS
The DES-105/108 Switch supports 802.1p priority queuing Quality of Service. The
implementation of QoS (Quality of Service) and benefits of using 802.1p priority queuing are
described here.
4
Features
The DES-105/108 is a high performance switch designed specifically for
environments where traffic on the network and the number of users
increase continuously.
DES-105/108 implements D-Link’s Green Technology special power-
saving features under speed at 100Mbps that link status and adjust power
usage accordingly. Further, D-Link Green implements the newly ratified
IEEE 802.3az Energy Efficient Ethernet standard for reducing energy
consumption of network links during periods of low utilization by
transitioning interfaces into low-power state without interrupting the
network connection.
DES-105/108 has special front access design for Ethernet ports/LEDs to
help user easier to understand and control network status. Metal case
design is useful for strengthening cooling and suitable for departmental
environment, providing users the best performance. DES-105/108 was
specially designed for small to mid-size workgroups and can be installed
where space is limited.
The DES-105/108 is ideal for deployment with multiple high-speed
servers for 10Mbps or 100Mbps shared-bandwidth workgroups. With the
highest bandwidth at 200Mbps (100Mbps full-duplex mode), any port can
provide workstations with a congestion-free data pipe for simultaneous
access to the server.
The DES-105/108 is scalable, allowing two or more DES-105/108 to be
cascaded together. Since all ports support 200Mbps, any one of its five
ports may be used to cascade to an additional switch to open a Full-Duplex
Fast Ethernet pipe.
The DES-105/108 is the perfect choice for a department or office planning
to upgrade to Fast Ethernet. The DES-105/108 can accommodate 10Mbps
or 100Mbps devices, providing a flexible solution for existing (10Mbps)
Ethernet workgroups.
The DES-105/108 combines dynamic memory allocation with store-and-
forward switching to ensure that the buffer is effectively allocated for each
port; and it controls the data flow between the transmit and receive nodes
5
to guarantee against possible packet loss.
The DES-105/108 is an unmanaged 10/100Mbps Fast Ethernet switch that
offers solutions for the accelerating bandwidth needs of small Ethernet
workgroups.
Other key features include:
Supports Auto-Negotiation for 10/100Mbps and duplex mode
Supports Auto-MDI/MDIX for each port
Supports Full/Half duplex transfer mode for 10 and 100Mbps
Back pressure flow control for half duplex
Full wire speed reception and transmission
Store-and-Forward switching method
Supports 8K absolute MAC addresses
Supports 128KBytes RAM for data buffering
IEEE 802.3x flow control for full duplex
IEEE 802.1p priority queues
6
UNPACKING AND SETUP
Unpacking
Open the box and carefully unpack it. The box should contain the
following items:
One DES-105/108: 5/8-Port 10/100Mbps Ethernet Switch
One External Power Adapter
Wall Mount Kit
Quick Installation Guide
If any item is missing or damaged, please contact your local reseller for a
replacement.
Setup
The setup of the DES-105/108 can be performed using the following steps:
The power outlet should be within 1.82 meters (6 feet) of the Switch.
Visually inspect the DC power jack and make sure that it is fully
secured to the power adapter.
Do not cover the ventilation holes on the sides of the Switch, and
make sure there is adequate ventilation around it.
Do not place heavy objects on the switch.
7
IDENTIFYING EXTERNAL COMPONENTS
Front Panel
The figure below shows the front panel of the DES-105/108.
DES-105/108 10/100Mbps Fast Ethernet Switch
Power/LED:
This green indicator light is on when the DES-105/108 is receiving
power; otherwise, it is off.
100Mbps Link/Activity, 10Mbps Link/Activity Indicator
100 Link/Act (green):
There are two LED indicators for each Ethernet port. The port LEDs
indicate a network link through the corresponding port. Blinking
indicates the Switch is either sending or receiving data to the port.
When the port LED glows in green, it indicates the port is running on
10M or 100M.
Auto MDI/MDI-X Ports:
All ports support automatic MDI/MDI-X crossover detection. The
AutoMDI/MDI-X function makes it simple to connect to the
switch—just plug either a Crossover or Straight-Through CAT5 cable
into any port.
8
Rear Panel
Power Jac
k:
Power is supplied through an external power adapter. Check the
technical specification section for information about the power input
voltage.
Since the DES-105/108 does not require a power button, plugging
DES-105/108 10/100Mbps Fast Ethernet Switch
its p
ower adapter into a power outlet will immediately power it on.
Kensington Security Slot
DES-105/108 has been giving customers the best option for physical
security through a Kensington Security Slot in the rear panel. The
Kensington Security Slot adds value to DES-105/108 by offering
customers a simple, built-in security solution.
Grounding the Switch
This section describes how to connect the switch to ground. You
must complete this procedure before powering your switch.
Required Tools and Equipment
Ground screws (included in the accessory kit): One M4 x 6 mm
(metric) pan-head screw
Ground cable (not included in the accessory kit): The grounding
cable should be sized according to local and national installation
requirements. Depending on the power supply and system, a 12 to
6 AWG copper conductor is required for U.S installation.
Commercially available 6 AWG wire is recommended. The
length of the cable depends on the proximity of the switch to
9
proper grounding facilities.
A
screwdriver (not included in the accessory kit)
The following steps let you connect the switch to a protective
ground:
Step 1: Verify if the system power is off.
Step 2: Use the ground cable to place the #8 terminal lug ring on top
of the ground-screw opening, as seen in the figure below.
Step 3: Insert the ground screw into the ground-screw opening.
Step 4: Using a screwdriver, tighten the ground screw to secure the
ground cable to the switch.
Step 5: Attach the terminal lug ring at the other end of the grounding
cable to an appropriate grounding stud or bolt on rack where
the switch is installed.
Step 6: Verify if the connections at the ground connector on the
switch and the rack are securely attached.
10
CONNECTING THE SWITCH
PC to DES-105/108
A computer can be connected to the DES-105/108 via a two-pair Category
3, 4, 5 UTP/STP Straight-Through or Crossover cable. A computer
equipped with a RJ-45 10/100Mbps port can be connected to any of the
five DES-105/108 ports.
The LED indicators for the PC connection depend on the capability of the
computer’s Ethernet card. If the LED indicators are not lit after making a
proper connection, check the computer’s Ethernet card, the cable, and the
DES-105/108’s conditions and connections.
Hub to DES-105/108
A hub (10 or 100BASE-TX) can be connected to the DES-105/108 via a
two-pair Category 3, 4, or 5 UTP/STP Straight-Through or Crossover
cable. For 100Mbps operation a Category 5 cable must be used. The
connection is accomplished from any port of the hub to any port of the
DES-105/108.
DES-105/108 to other devices
The DES-105/108 can be connected to another switch or other devices
(routers, bridges, etc.) via a two-pair Category 3, 4, 5 UTP/STP Straight-
Through or Crossover cable. A Category 5 cable must be used for
100Mbps operation. The connection can be accomplished from any (MDI-
X) port on the DES-105/108 to any of the 10Mbps or 100Mbps (MDI-X)
ports on another switch or other devices.
11
Port Speed & Duplex Mode
After plugging the selected cable to a specific port, the system uses auto-
negotiation to determine the transmission mode, auto-detecting the
network speed (10Mbps or 100Mbps) for any new twisted-pair connection.
If the attached device does not support auto-negotiation or has auto-
negotiation disabled, an auto-sensing process is initiated to select the
speed and half-duplex mode is selected.
12
MOUNTING THE SWITCH ON A WALL
The DES-105/108 can also be mounted on a wall. Two mounting slots are
provided on the bottom of the switch for this purpose. Please make sure
that the front panel is exposed in order to view the LEDs. Please refer to
the illustration below:
A.) Mounting on a cement wall
1. Mount the Nylon screw anchors into a cement wall.
2. Drive the T3 x 15L screws into the Nylon screw anchors.
3. Hook the mounting holes of the switch back on the screws; you
have completed the wall-mount.
B.) Mounting on a wood wall
1. Drive the T3 x 15 L screws into the wood wall.
2. Hook the mounting holes of the switch back on the screws; you
have completed the wall-mount.
(1) 3/4 inch minimum
for wood wall
(2) 3 inch minimum
for cement wall.
13
TECHNICAL SPECIFICATIONS
General
Standards IEEE 802.3 10BASE-T Ethernet
IEEE 802.3u 100BASE-TX Fast Ethernet
Protocol CSMA/CD
Data Transfer Rate Ethernet: 10Mbps (half duplex)
20Mbps
(full-duplex)
Fast Ethernet: 100Mbps
(half duplex)
200Mbps
(full- duplex)
Topology Star
Network Cables 10BASE-T: 2-pair UTP CAT. 3,4,5/5e (100 m), EIA/TIA-
568 100-ohm STP (100 m)
100BASE-TX: 2-pair UTP CAT. 5/5e (100 m), EIA/TIA-568
100-ohm STP (100 m)
Number of Ports
5/8 x 10/100Mbps auto-negotiation, auto MDI/MDI-X ports
Physical and Environmental
DC inputs
DC 5V/1A
Power Consumption
DES-105
DC input: 1.9 Watts
AC input: 2.7 Watts
DES-108
DC input: 2.1 Watts
AC input: 2.7 Watts
Temperature
Operating: 0 ~ 50 C (32º to 122º F)
Storage: -10 ~ 70 C (14ºto 158º F)
Humidity Operating: 10% ~ 90% RH, Non-condensing
Storage: 5% ~ 90% RH, Non-condensing
Dimensions (W x H x D) 5-Port 100 x 98 x 28mm (3.93 x 3.85 x 1.10 inch)
8-Port 162 x 102 x 28mm (6.37 x 4.01 x 1.10 inch)
EMI: FCC Class B, CE Class B
Safety UL/LVD
14
Performance
Transmission Method: Store-and-forward
RAM Buffer 128Kbytes per device
Filtering Address Table 8K entries per device
Packet Filtering /
Forwarding Rate:
10Mbps Ethernet: 14,880/pps
100Mbps Fast Ethernet: 148,800/pps
MAC Address Learning: Automatic update
15
RJ-45 PIN SPECIFICATION
The following diagram and tables show the standard RJ-45
receptacle/connector and their pin assignments.
RJ-45 Connector pin assignment
Contact Media Direct Interface Signal
1 Rx +(receive)
2 Rx - (receive)
3 Tx + (transmit)
4 Not used
5 Not used
6 Tx - (transmit)
7 Not used
8 Not used
RJ-45 pin assignment
Standard RJ-45 receptacle/connector
4

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