ADTRAN 4200659L2 User Manual
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Appendix C Acronyms/Abbreviations

ACO ................

alarm cut off

ACT.................

active

AIS...................

alarm indication signal

ALM................

alarm

AMI .................

alternate mark inversion

Amp.................

amphenol

ANSI................

American National Standards Institute

async................

asynchronous

BERT...............

bit error rate test

bps ...................

bits per second

BPV .................

bipolar violation

CA....................

communications equipment available

CAIS................

carrier side alarm indication signal

CCITT.............

Consultive Committee for International Telephony and Telegraphy

CCV.................

C-bitcoding violation

CD....................

carrier detect

CES..................

C-biterrored seconds

CO ...................

central office

CPE .................

customer premise equipment

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Appendix C. Acronyms/Abbreviations

CRC ................

cyclic redundancy check

CS....................

clear to send

CSES...............

C-bitseverely errored seconds

CSU.................

channel service unit

CTS .................

clear to send

CV ...................

coding violation

dB....................

decibel

DBU ................

dial backup

DCD ................

data carrier detect

DCE ................

data communications equipment

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

DSX-1..............

digital signal cross connect, level 1

DTE.................

data terminal equipment

DTR ................

data terminal ready

ES....................

errored seconds

Eq....................

equipment

Eqpt ................

equipment

EXZ.................

excessive zeros

FBE .................

F-biterrors

FCC.................

Federal Communications Commission

FDL.................

facility datalink

FEAC..............

far-endalarm and control

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Appendix C. Acronyms/Abbreviations

FEBE...............

far end block error

HSSI ................

high-speedserial interface

IP .....................

internet protocol

KA ...................

keep alive

LAIS................

loop side alarm indication signal

LAN.................

local area network

LCV.................

line coding violation

LED .................

light emitting diode

LES..................

line errored seconds

LIU ..................

line interface unit

LL....................

local loopback

LOF .................

loss of framing

LOS .................

loss of signal

MBE ................

M-biterrors

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-returnto zero

NSA .................

non service affecting

OCU ................

office channel unit

OOF.................

out of frame

OOS.................

out of service

PCV .................

P-bitcoding violation

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Appendix C. Acronyms/Abbreviations

PES..................

P-biterrored seconds

POP.................

point of presence

PPP..................

point-to-pointprotocol

PRF .................

performance

PSES ...............

P-bitseverely errored seconds

PSTN...............

public switched telephone network

PVC.................

permanent virtual circuit

RD ...................

receive data

RDL ................

remote digital loopback

RL ...................

remote loopback

RMA ...............

return material authorization

RS....................

request to send

RTS .................

request to send

Rx....................

receive

SA....................

service affecting

SEFS ...............

severely errored framing seconds

SES..................

severely errored seconds

SLIP ................

serial line internet protocol

SNMP..............

simple network management protocol

SONET ...........

synchronous optical network

SR....................

data set ready

SW56...............

switched 56

sync .................

synchronous

TA....................

terminal equipment available

TD ...................

transmit data

TDM................

time division multiplexing

TM ..................

test mode

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Appendix C. Acronyms/Abbreviations

TR....................

data terminal ready

Tx.....................

transmit

UAS .................

unavailable seconds

WAN ................

wide area network

XCV.................

excessive coding violations

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