Glossary_ 115
DNS
The Domain Name Server (DNS) is a system that stores information
associated with domain names in a distributed database on networks,
such as the Internet.
Dot Matrix Printer
A dot matrix printer refers to a type of computer printer with a print head
that runs back and forth on the page and prints by impact, striking an
ink-soaked cloth ribbon against the paper, much like a typewriter.
DPI
Dots Per Inch (DPI) is a measurement of resolution that is used for
scanning and printing. Generally, higher DPI results in a higher
resolution, more visible detail in the image, and a larger file size.
DRPD
Distinctive Ring Pattern Detection. Distinctive Ring is a telephone
company service which enables a user to use a single telephone line to
answer several different telephone numbers.
Duplex
A mechanism that will automatically flip over a sheet of paper so that the
machine can print (or scan) on both sides of the paper. A printer
equipped with a Duplex can print double-sided of paper.
Duty Cycle
Duty cycle is the page quantity which does not affect printer
performance for a month. Generally the printer has the lifespan limitation
such as pages per year. The lifespan means the average capacity of
print-outs, usually within the warranty period. For example, if the duty
cycle is 48,000 pages per month assuming 20 working days, a printer
limits 2,400 pages a day.
ECM
Error Correction Mode (ECM) is an optional transmission mode built into
Class 1 fax machines or fax modems. It automatically detects and
corrects errors in the fax transmission process that are sometimes
caused by telephone line noise.
Emulation
Emulation is a technique of one machine obtaining the same results as
another.
An emulator duplicates the functions of one system with a different
system, so that the second system behaves like the first system.
Emulation focuses on exact reproduction of external behavior, which is
in contrast to simulation, which concerns an abstract model of the
system being simulated, often considering its internal state.
Ethernet
Ethernet is a frame-based computer networking technology for local
area networks (LANs). It defines wiring and signaling for the physical
layer, and frame formats and protocols for the media access control
(MAC)/data link layer of the OSI model. Ethernet is mostly standardized
as IEEE 802.3. It has become the most widespread LAN technology in
use during the 1990s to the present.
EtherTalk
A suite of protocols developed by Apple Computer for computer
networking. It was included in the original Macintosh (1984) and is now
deprecated by Apple in favor of TCP/IP networking.
FDI
Foreign Device Interface (FDI) is a card installed inside the machine to
allow a third party device such as a coin operated device or a card
reader. Those devices allow the pay-for-print service on your machine.
FTP
A File Transfer Protocol (FTP) is a commonly used protocol for
exchanging files over any network that supports the TCP/IP protocol
(such as the Internet or an intranet).
Fuser Unit
The part of a laser printer that melts the toner onto the print media. It
consists of a hot roller and a back-up roller. After toner is transferred
onto the paper, the fuser unit applies heat and pressure to ensure that
the toner stays on the paper permanently, which is why paper is warm
when it comes out of a laser printer.
Gateway
A connection between computer networks, or between a computer
network and a telephone line. It is very popular, as it is a computer or a
network that allows access to another computer or network.
Grayscale
A shades of gray that represent light and dark portions of an image
when color images are converted to grayscale; colors are represented
by various shades of gray.
Halftone
An image type that simulates grayscale by varying the number of dots.
Highly colored areas consist of a large number of dots, while lighter
areas consist of a smaller number of dots.
HDD
Hard Disk Drive (HDD), commonly referred to as a hard drive or hard
disk, is a non-volatile storage device which stores digitally-encoded data
on rapidly rotating platters with magnetic surfaces.
IEEE
The Institute of Electrical and Electronics Engineers (IEEE) is an
international non-profit, professional organization for the advancement
of technology related to electricity.
IEEE 1284
The 1284 parallel port standard was developed by the Institute of
Electrical and Electronics Engineers (IEEE). The term "1284-B" refers to
a specific connector type on the end of the parallel cable that attaches to
the peripheral (for example, a printer).
