Appendix C. Acronyms/Abbreviations

DDS

digital data service

DLCI

data link connection identifier

DS1

digital signal level one

DS3

digital signal level three

DSR

data set ready

DSU

data service unit

DTE

data terminal equipment

DTR

data terminal ready

ES

errored seconds

EXZ

excessive zeros

FBE

F-bit errors

FCC

Federal Communications Commission

FDL

facility datalink

FEBE

far end block error

HSSI

high-speed serial interface

IP

internet protocol

KA

keep alive

LAN

local area network

LCV

line coding violation

LED

light emitting diode

LES

line errored seconds

LL

local loopback

LOS

loss of signal

MBE

M-bit errors

Mbps

megabits per second

MIB

management information base

ms

millisecond

NC

normally closed

NI

network interface

NMS

network management system

NO

normally open

NRZ

non-return to zero

OCU

office channel unit

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ADTRAN T3SU 300 user manual Dds