Acronym

ABR

Available bit rate

ANSI

American National Standards Institute

API

Application programming interface

APPN

Advanced Peer-to-Peer Networking

ARM

Alarm relay module

ASIC

Application-specific integrated circuit

ATM

Asynchronous Transfer Mode

BT

Burst tolerance

BTM

Broadband trunk module

CAC

Connection admission control

CAS

Channel-associated signaling

CBR

Constant bit rate

CCITT

Consultative Committee for International Telegraph and Telephone

CCS

Common channel signaling

CDVT

Cell delay variation tolerance

CIR

Committed information rate

Cisco IOS

Cisco Internetwork Operating System

CLLM

Consolidated link-layer messages

CLP

Cell loss priority

CODEC

Coder-Decoder

CoS

Class of Service

CPE

Customer premises equipment

CRC

Cyclic redundancy check

CVM

Channelized voice module

dB

Decibels

DDS

Digital data service

DLCI

Data-link connection identifier

DS1

Digital signal level 1

DS0

Digital signal level 0 (24 DS0s in a DS1)

DS0A

A mechanism to carry a subrate DDS channel in a DS0

DSU

Data service unit

EEPROM

Electrically erasable programmable read-only memory

EFCI

Explicit Forward Congestion Indication

EIA

Electronic Industries Association

ELMI

Enhanced local management interface

EMI

Electromagnetic interference

ER

Explicit rate

ETSI

European Telecommunications Standards Institute

FCI

Forward congestion indicator

FRAD

Frame Relay access device

FRM

Frame Relay module

GBps

Gigabits per second

HDB3

Line code type used on E3 circuits

HDLC

High-Level Data-Link Control

HDM

High-speed data module

HEC

Header error control

IEC

International Electrotechnical Commission

IETF

Internet Engineering Task Force

ILMI

Integrated Local Management Interface

IMA

Inverse multiplexing over ATM

IP

Internet Protocol

ISDN

Integrated Service Digital Network

KBps

Kilobits per second

LAN

Local-area network

LDI

Low-speed data interface

LDM

Low-speed data module

LED

Light emitting diode

LMI

Local management interface

LOS

Loss of signal

LSB

Least significant bit

Mbps

Megabits per second

MCR

Minimum cell rate

MIB

Management information base

MIPS

Millions of instructions per second

MMF

Multimode fiber

MPLS

Multiprotocol Level Switching

MSB

Most significant bit

NNI

Network-to-Network Interface

NPM

Network processor module

NTM

Network trunk module

OAM

Operation, Administration, and Maintenance

OC

Optical carrier

OSPF

Open shortest path first

PBX

Private branch exchange

PCM

Pulse code modulation

PCR

Peak cell rate

PCS

Port Concentrator Shelf

PEM

Power Entry Module

PLCP

Physical layer convergence procedure

P-NNI

Private Network-to-Network Interface

PoP

Point of Presence

PPP

Point-to-Point Protocol

PVC

Permanent virtual circuit

QoS

Quality of Service

RFI

Radio frequency interference

RPS

Repetitive pattern suppression

SAC

Service activation center

SCM

System clock module

SCR

Sustainable cell rate

SDH

Synchronous Digital Hierarchy

SDLC

Synchronous Data-Link Control

SLA

Service Level Agreement

SMDS

Switched Multimegabit Data Service

SMF

Single-mode fiber

SNA

Systems Network Architecture

SNMP

Simple Network Management Protocol

SONET

Synchronous Optical Network

SPX

Sequenced Packet Exchange

STM

Synchronous Transport Module

SVC

Switched virtual circuit

TCP

Transmission Control Protocol

TDM

Time-division multiplexing

TDP

Tag distribution protocol

TM

Traffic management

TR

Technical reference

UBR

Unspecified bit rate

UFM

Universal Frame Relay module

UNI

User-Network Interface

UVM

Universal voice module

VAD

Voice activity detection

VBC

Variable bit rate

VC

Virtual circuit

VCI

Virtual channel identifier

VD

Virtual destination

VF

Voice frequency

VNS

Voice network switching

VoFR

Voice over Frame Relay

VoIP

Voice over IP

VP

Virtual path

VPI

Virtual path identifier

VPN

Virtual private network

VS

Virtual source

VSI

Virtual switch interface

VToA

Voice transport over ATM

WAN

Wide-area network

ZCS

Zero code suppression

ABR	Available bit rate
ANSI	American National Standards Institute
API	Application programming interface
APPN	Advanced Peer-to-Peer Networking
ARM	Alarm relay module
ASIC	Application-specific integrated circuit
ATM	Asynchronous Transfer Mode
BT	Burst tolerance
BTM	Broadband trunk module
CAC	Connection admission control
CAS	Channel-associated signaling
CBR	Constant bit rate
CCITT	Consultative Committee for International Telegraph and Telephone
CCS	Common channel signaling
CDVT	Cell delay variation tolerance
CIR	Committed information rate
Cisco IOS	Cisco Internetwork Operating System
CLLM	Consolidated link-layer messages
CLP	Cell loss priority
CODEC	Coder-Decoder
CoS	Class of Service
CPE	Customer premises equipment
CRC	Cyclic redundancy check
CVM	Channelized voice module
dB	Decibels
DDS	Digital data service
DLCI	Data-link connection identifier
DS1	Digital signal level 1
DS0	Digital signal level 0 (24 DS0s in a DS1)
DS0A	A mechanism to carry a subrate DDS channel in a DS0
DSU	Data service unit
EEPROM	Electrically erasable programmable read-only memory
EFCI	Explicit Forward Congestion Indication
EIA	Electronic Industries Association
ELMI	Enhanced local management interface
EMI	Electromagnetic interference
ER	Explicit rate
ETSI	European Telecommunications Standards Institute
FCI	Forward congestion indicator
FRAD	Frame Relay access device
FRM	Frame Relay module
GBps	Gigabits per second
HDB3	Line code type used on E3 circuits
HDLC	High-Level Data-Link Control
HDM	High-speed data module
HEC	Header error control
IEC	International Electrotechnical Commission
IETF	Internet Engineering Task Force
ILMI	Integrated Local Management Interface
IMA	Inverse multiplexing over ATM
IP	Internet Protocol
ISDN	Integrated Service Digital Network
KBps	Kilobits per second
LAN	Local-area network
LDI	Low-speed data interface
LDM	Low-speed data module
LED	Light emitting diode
LMI	Local management interface
LOS	Loss of signal
LSB	Least significant bit
Mbps	Megabits per second
MCR	Minimum cell rate
MIB	Management information base
MIPS	Millions of instructions per second
MMF	Multimode fiber
MPLS	Multiprotocol Level Switching
MSB	Most significant bit
NNI	Network-to-Network Interface
NPM	Network processor module
NTM	Network trunk module
OAM	Operation, Administration, and Maintenance
OC	Optical carrier
OSPF	Open shortest path first
PBX	Private branch exchange
PCM	Pulse code modulation
PCR	Peak cell rate
PCS	Port Concentrator Shelf
PEM	Power Entry Module
PLCP	Physical layer convergence procedure
P-NNI	Private Network-to-Network Interface
PoP	Point of Presence
PPP	Point-to-Point Protocol
PVC	Permanent virtual circuit
QoS	Quality of Service
RFI	Radio frequency interference
RPS	Repetitive pattern suppression
SAC	Service activation center
SCM	System clock module
SCR	Sustainable cell rate
SDH	Synchronous Digital Hierarchy
SDLC	Synchronous Data-Link Control
SLA	Service Level Agreement
SMDS	Switched Multimegabit Data Service
SMF	Single-mode fiber
SNA	Systems Network Architecture
SNMP	Simple Network Management Protocol
SONET	Synchronous Optical Network
SPX	Sequenced Packet Exchange
STM	Synchronous Transport Module
SVC	Switched virtual circuit
TCP	Transmission Control Protocol
TDM	Time-division multiplexing
TDP	Tag distribution protocol
TM	Traffic management
TR	Technical reference
UBR	Unspecified bit rate
UFM	Universal Frame Relay module
UNI	User-Network Interface
UVM	Universal voice module
VAD	Voice activity detection
VBC	Variable bit rate
VC	Virtual circuit
VCI	Virtual channel identifier
VD	Virtual destination
VF	Voice frequency
VNS	Voice network switching
VoFR	Voice over Frame Relay
VoIP	Voice over IP
VP	Virtual path
VPI	Virtual path identifier
VPN	Virtual private network
VS	Virtual source
VSI	Virtual switch interface
VToA	Voice transport over ATM
WAN	Wide-area network
ZCS	Zero code suppression

Table of Contents

Acronym

Acronym