Acronyms and Abbreviations

FECN

forward explicit congestion notification

FEP

front end processor

FIFO

first in first out

FR

frame relay

FRAD

frame relay access device

FRF

frame relay forum

FSU

frame relay service unit

HDLC

high-speed data link control

IP

internet protocol

ISDN

integrated services digital network

ITU

International Telecommunications Union

KA

keep alive

LAN

local area network

LED

light emitting diode

LLC

logical link control

LMI

local management interface

LRC

lateral redundancy check

MIB

management information base

ms

millisecond

NRZ

non-return to zero

NRZI

non-return to zero inverted

OCU

office channel unit

OOS

out of service

PPP

point to point protocol

PU

physical unit

PVC

permanent virtual circuit

RD

receive data

RDL

remote digital loopback

RFC

request for comments

RFECN

remote forward explicit congestion notification

RIP

routing information protocol

RMA

return material authorization

RR

receiver ready

RS

recommended standard

RTS

request to send

Rx

receive

SAP

service access point

SDLC

synchronous data link control

SLIP

serial line internet protocol

SNA

systems network architecture

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FSU User Manual

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ADTRAN 1200130L1, 1200130L2 user manual Fecn