Interphase Tech 4538 - Manual (Page 145)

Glossary
4538 Hardware Reference Manual 123
DSX1 u Cross-connection point for DS1 signals.
DTE u Data Terminal Equipment Device at the user end of a user-network interface that serves as a data
source, destination, or both. DTE connects to a data network through a DCE device (for example, a modem)
and typically uses clocking signals generated by the DCE. DTE includes such devices as computers, protocol
translators, and multiplexers.
E1 u Wide-area digital transmission scheme used predominantly in Europe that carries data at a rate of
2.048 Mbps. E1 lines can be leased for private use from common carriers.
E3 u Wide-area digital transmission scheme used predominantly in Europe that carries data at a rate of
34.368 Mbps. E3 lines can be leased for private use from common carriers.
EEPROM u Electrically Erasable Programmable Read-Only Memory A nonvolatile PROM that can be
written as well as read form. Usually used to hold information about the current system configuration, alter-
nate boot paths, etc.
ELAN u Emulated LAN ATM network in which an Ethernet or Token Ring LAN is emulated using a client-
server model. ELANs are composed of an LEC , an LES , a BUS , and an LECS . Multiple ELANs can exist
simultaneously on a single ATM network. ELANs are defined by the LANE specification.
END u Enhanced Network Driver
EPLD u Electrically Programmable Logic Device
ES u End System Generally, an end-user device on a network.
ESF u Extended Superframe Format Framing type used on T1 circuits that consists of 24 frames of 192
bits each, with the 193rd bit providing timing and other functions.
Ethernet u Baseband LAN specification invented by Xerox Corporation and developed jointly by Xerox,
Intel, and Digital Equipment Corporation.
FCC u Federal Communications Commission The Government agency responsible for regulating tele-
communications in the United States.
FCC u Fast serial Communication Controllers Used to control the fast Ethernet port.
FDDI u Fiber Distributed Data Interface LAN standard, defined by ANSI X3T9.5, specifying a 100-Mbps
token-passing network using fiber-optic cable, with transmission distances of up to 2 km. FDDI uses a dual-
ring architecture to provide redundancy.
Flash u Nonvolatile storage that can be electrically erased and reprogrammed so that software images can
be stored, booted, and rewritten as necessary.
Frame Relay u Industry-standard, switched data link layer protocol that handles multiple virtual circuits
using HDLC encapsulation between connected devices. Frame Relay is more efficient than X.25 , the protocol
for which it is generally considered a replacement.
FTP u File Transfer Protocol Application protocol, part of the TCP/IP protocol stack, used for transferring
files between network nodes.
GB u GigaBytes 10
9
bytes per second.
Gbps u Gigabits per second 10
9
bits per second.
HDLC u High-Level Data Link Control Bit-oriented synchronous data link layer protocol developed by
ISO . Derived from SDLC , HDLC specifies a data encapsulation method on synchronous serial links using
frame characters and checksums.
IMA u Inverse Multiplexing over ATM Standard protocol defined by the ATM Forum in 1997.
IMMR u Internal Memory Map Register
IP u Internet Protocol Network layer protocol in the TCP/IP stack offering a connectionless internet-
work service. IP provides features for addressing, type-of-service specification, fragmentation and reassem-
bly, and security.
ISDN u Integrated Services Digital Network Communication protocol, offered by telephone companies,
that permits telephone networks to carry data, voice, and other source traffic.
ISO u International Organization for Standardization International organization that is responsible for
a wide range of standards, including those relevant to networking. ISO developed the OSI reference model, a
popular networking reference model.