Appendix C. Acronyms and Abbreviations

FSU

frame relay service unit

FT1

fractional T1

GUI

graphical user interface

HDLC

high-speed data link control

IA

inactive

IP

internet protocol

ISDN

integrated services digital network

ITU

International Telecommunications Union

IXC

interexchange carrier

KA

keep alive

kbps

kilobits per second

LAN

local area network

LBO

line buildout

LEC

local exchange carrier

LED

light emitting diode

LI

link integrity

LLC

logical link control

LOS

loss of signal

LMI

local management interface

LRC

lateral redundancy check

MIB

management information base

ms

millisecond

NI

network interface

OCU

office channel unit

OOS

out of service

POP

point-of-presence

PPP.................... point-to-point protocol

PRM

performance report message

PRI

Primary Rate ISDN

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