Abbreviations and Acronyms

Abbreviation
or Acronym

Term

A

 

AAA

authentication, authorization, and accounting

AAAA

authentication, authorization, accounting, and address assignment

AAL

ATM Adaptation Layer

ABR

area border router

AC

alternating current; access concentrator

ACCM

Async Control Character Map

ADSL

asymmetric digital subscriber line

AESA

ATM end system address

AF

assured forwarding

AFI

authority and format identifier

AH

authentication header

AIS

alarm indication signal

AIS-L

alarm indication signal – line

AIS-P

alarm indication signal – path

ALG

application-level gateway

ANSI

American National Standards Institute

API

application programming interface

APS

Automatic Protection Switching

ARP

Address Resolution Protocol

AS

autonomous system; Australia (re standards compliance)

AS boundary router

autonomous system boundary router

ASCII

American Standard Code for Information Interchange

ASIC

application-specific integrated circuit

AS number

autonomous system number

ATM

Asynchronous Transfer Mode

AVP

attribute-value pair

B

 

backup DR

backup designated router

BECN

backward explicit congestion notification

BER

bit error rate

BERT

bit error rate test

BFD

Bidirectional Forwarding Detection (protocol)

BGP

Border Gateway Protocol

BMA

broadcast multiaccess

BOOTP

bootstrap protocol

B-RAS

Broadband Remote Access Server

BSD

Berkeley Software Distribution

C

 

CA

certificate authority

CAC

call admission control (MPLS); connection admission control (ATM)

CAM

content-addressable memory

CAP

carrierless amplitude phase

CAR

committed access rate

CARS

committed access rate service

CBC

cipher block chaining

CBR

constant bit rate

CC

continuity check

CCITT

International Telegraph and Telephone Consultative Committee

CCP

Compression Control Protocol

CDV

cell delay variation

CDVT

cell delay variation tolerance

CE

customer edge device

CHAP

Challenge Handshake Authentication Protocol

CIDR

classless interdomain routing

CISPR

International Special Committee on Radio Interference

CLACL

classifier control list

CLEC

competitive local exchange carrier

CLI

command-line interface

CLNP

Connectionless Network Protocol

CLNS

Connectionless Network Service

CLP

cell loss priority

CMDA

code division multiple access

CMTS

cable modem termination system

COA

change of authorization

cOC

channelized optical carrier

COPS

Common Open Policy Service (protocol)

CORBA

Common Object Request Broker Architecture

CoS

class of service

CPE

customer premises equipment

CPU

central processing unit

CRC

cyclic redundancy check

CR-LDP

Constraint-Based Routed Label Distribution Protocol

CR-LSP

constraint-based routed label-switched path

CSNP

complete sequence number PDU (protocol data unit)

CSU

channel service unit

CT1, CT3

channelized T1, T3

CTI

computer telephony integration

CTS

clear to send

CTT

connection traffic table

CUL

agreement between Underwriter Laboratories and Canadian Standards Association for joint product safety approval

D

 

DC

direct current

DCC

Data Country Code

DCD

data carrier detect

DCE

data communication equipment

DCM

dynamic configuration manager

DE

discard eligibility

DES; 3DES

Data Encryption Standard; triple DES

DF

don’t fragment (bit)

DHCP

Dynamic Host Configuration Protocol

DIS

designated intermediate system

DLCI

data-link connection identifier

DLCMI

data-link connection management interface

DMZ

demilitarized zone

DNIS

dialed number identification service

DNS

Domain Name System

DNS-ALG

Domain Name System – Application Level Gateway

DOCSIS

Data over Cable System Interface Specifications

DoS

denial of service

DPD

dead peer detection

DR

designated router

DS

digital signal; DiffServ

DS-BGP

dual-stack Border Gateway Protocol

DSI

dynamic subscriber interface

DSL

digital subscriber line

DSLAM

digital subscriber line access multiplexer

DSP

domain-specific part

DSR

data set ready

DSS

Digital Signature Standard

DST

Daylight Saving Time

DSU

data service unit

DTE

data terminal equipment

DTR

data terminal ready

DU

downstream unsolicited

DVMRP

Distance Vector Multicast Routing Protocol

DXI

data exchange interface (abbreviation pronounced “ dixie” )

E

 

EAP

Extensible Authentication Protocol

EBGP

external Border Gateway Protocol

ECC

error checking and correction; error-checking code

ECMP

equal-cost multipath

ECP

Encryption Control Protocol

EEPROM

electrically erasable programmable read-only memory

EF

expedited forwarding

EFA

egress forwarding ASIC

EGP

exterior gateway protocol

E-LSP

EXP-inferred-PSC LSP

EN

European Norm

EPD

early packet discard

ES

end system

ESD

electrostatic discharge

ESF

extended superframe

ESI

end system identifier

ESP

Encapsulating Security Payload

EXP

experimental (refers to bits in MPLS shim header)

F

 

FAT

file allocation table

FCC

Federal Communications Commission

FCS

frame check sequence

FDL

facilities data link

FE

Fast Ethernet

FE-2

dual-port Fast Ethernet

FEC

forwarding equivalence class (abbreviation pronounced “ feck” )

FECN

forward explicit congestion notification

FERF

far-end receive failure

FFA

frame forwarding ASIC

FIB

forwarding information base

FIFO

first-in, first-out

FIN

finish (bit)

FPGA

field programmable gate array

FQDN

fully qualified domain name

FRU

field-replaceable unit

FSM

finite state machine

FTE

forwarding table entry

FTP

File Transfer Protocol

G

 

Gbps

gigabits per second

GE

Gigabit Ethernet

giaddr

gateway IP address

GRE

Generic Routing Encapsulation

GRxx

(refers to Bellcore standards)

GUI

graphical user interface

H

 

HAR

hierarchical assured rate

HDLC

High-Level Data Link Control; High-Speed Data Link Control

HMAC

Hashed Message Authentication Code

HO-DSP

high-order domain-specific part

HRR

hierarchical round-robin

HSSI

high-speed serial interface (abbreviation pronounced “ hissy” )

I

 

I/O

input/output

IANA

Internet Assigned Numbers Authority

IAPP

Inter Access Point Protocol

IBGP

internal Border Gateway Protocol

IC CS

Industry Canada Communications Section

ICD

International Code Designator

ICMP

Internet Control Message Protocol

ICRQ

incoming-call request

ID

identification; identifying; identifier

I-DAS

integrated DHCP access server

IDI

initial domain identifier

IDP

initial domain part

IDSL

ISDN digital subscriber line

IEC

International Electrotechnical Commission

IEEE

Institute of Electrical and Electronics Engineers

IETF

Internet Engineering Task Force

IGMP

Internet Group Management Protocol

IGP

interior gateway protocol

IIF

incoming interface

IKE

Internet Key Exchange

ILEC

incumbent local exchange carrier

ILMI

Integrated Local Management Interface

InARP

Inverse Address Resolution Protocol

IOA

input/output adapter

IP

Internet Protocol

IPCP

Internet Protocol Control Protocol

IPoA

Internet Protocol over Asynchronous Transfer Mode

IPsec

Internet Protocol Security

IRDP

ICMP Router Discovery Protocol

ISAKMP

Internet Security Association and Key Management Protocol

ISDN

Integrated Services Digital Network

IS-IS

Intermediate System–to–Intermediate System

ISM

IPsec Service module

ISO

International Organization for Standardization

ISP

Internet service provider

IS Voice

Intelligent Service Voice application

ITU-T

International Telecommunication Union – Telecommunication Standardization

J

 

JATE

Japan Approvals Institute for Telecommunications Terminal Equipment

JDBC

Java Database Connectivity

K

 

KB

kilobyte(s)

Kbps

kilobits per second

L

 

L2TP

Layer 2 Tunneling Protocol

LAC

L2TP access concentrator

LAG

link aggregation group

LAN

local area network

LCP

Link Control Protocol

LDAP

Lightweight Directory Access Protocol

LDP

Label Distribution Protocol

LED

light-emitting diode

LER

label edge router

LIB

label information base

LIP

Link Integrity Protocol

LLC

logical link control

L-LSP

label-only-inferred-PSC LSP

LMI

local management interface; link management interface

LNS

L2TP network server

LOF

loss of frame

LOP

loss of pointer

LOS

loss of signal

LSA

link-state advertisement

LSDB

link-state database

LSP

label-switched path; link-state PDU; link-state protocol

LSR

label-switching router

M

 

MAC

media access control; Message Authentication Code

MAU

medium attachment unit

MB

megabyte(s)

MBGP

multicast Border Gateway Protocol

MBone

multicast backbone

Mbps

megabits per second

MBS

maximum burst size

MD5

Message Digest 5

MDL

maintenance data link

MDx

Message Digest x (hash algorithm)

MED

multiple exit discriminator

MGTM

multicast group table manager

MIB

Management Information Base

MLFR

Multilink Frame Relay

MLPPP

Multilink Point-to-Point Protocol

motd

message of the day

MOTM

message of the minute

MP-BGP

Border Gateway Protocol multiprotocol extensions (sometimes referred to as multiprotocol Border Gateway Protocol)

MPLS

Multiprotocol Label Switching

mrinfo

multicast router information

MRRU

multilink maximum received reconstructed unit

MRU

maximum receive unit

MSDP

Multicast Source Discovery Protocol

MSO

multiple service operator

MSP

Multiplex Section Protection

MSS

maximum segment size

MTU

maximum transmission unit; multitenant unit

N

 

NAK

negative acknowledgment

NAPT

Network Address Port Translation

NAS

network access server

NAT

Network Address Translation

NBMA

nonbroadcast multiaccess

NCP

Network Control Protocol

ND

Neighbor Discovery

NEBS

Network Equipment Building System

NET

network entity title

NLRI

network layer reachability information

NMC

Network Management Center

NMS

network management system

NNI

network-to-network interface

NRZ

nonreturn to zero

NRZI

nonreturn to zero inverted

NSAP

network service access point

NSF

nonstop forwarding

NSSA

not-so-stubby area (refers to OSPF routing)

NTP

Network Time Protocol

NVRAM

nonvolatile random-access memory

NVS

nonvolatile storage

O

 

OAM

operations, administration, and management

OC

optical carrier

ODBC

Open Database Connectivity

OID

object identifier

OIF

outgoing interface

ORF

outbound route filter; outbound route filtering

OSI

Open Systems Interconnection

OSINLCP

OSI Internet Link Control Protocol; OSI Network Layer Control Protocol

OSPF

Open Shortest Path First

OSS

operations support system

P

 

P

provider core router

PADI

PPPoE Active Discovery Initiation

PADM

PPPoE Active Discovery Message

PADN

PPPoE Active Discovery Network

PADO

PPPoE Active Discovery Offer

PADR

PPPoE Active Discovery Request

PADS

PPPoE Active Discovery Session

PADT

PPPoE Active Discovery Termination

PAP

Password Authentication Protocol

PBX

private branch exchange

PCMCIA

Personal Computer Memory Card International Association

PCR

peak cell rate

PDU

protocol data unit

PE

provider edge router

PFC

Protocol Field Compression

PFS

perfect forward secrecy

PHB

per-hop behavior

PHP

penultimate hop pop

PIB

Policy Information Base

PIM

Protocol Independent Multicast; power input module

PIM DM

Protocol Independent Multicast dense mode

PIM S-DM

Protocol Independent Multicast sparse-dense mode

PIM SM

Protocol Independent Multicast sparse mode

PIM SSM

Protocol Independent Multicast source-specific multicast

PKI

public key infrastructure

PLCP

physical layer convergence procedure

PM

policy manager

PNNI

private network-to-network interface

POP

point of presence

POS

packet over SONET

POST

power-on self-test

PPP

Point-to-Point Protocol

PPPoE

Point-to-Point Protocol over Ethernet

pps

packets per second

PROM

programmable read-only memory

PSC

per-hop scheduling class

PSNP

partial sequence number PDU (protocol data unit)

PVC

permanent virtual circuit (or connection)

Q

 

QoS

quality of service

R

 

RADIUS

Remote Authentication Dial-In User Service

RD

route distinguisher

RDBS

relational database system

RDI

remote defect indication

RED

random early detection

REI

remote error indication

RESV

reservation

RFC

Request for Comments

RIB

routing information base

RIP

Routing Information Protocol

RISC

reduced instruction set computing

RMI

Remote Method Invocation (Java)

RP

rendezvous point (router)

RPF

reverse-path forwarding

RSA

Rivest-Shamir-Adleman (encryption algorithm)

RSVP

Resource Reservation Protocol

RSVP-TE

Resource Reservation Protocol with traffic engineering extensions

RTM

resource threshold monitor

RTR

Response Time Reporter

RTSP

Real-Time Streaming Protocol

RWS

receive window size

RX

receive

S

 

SA

security association

SAFI

subsequent address family identifier

SAR

segmentation and reassembly

SC

system controller

SCCRQ

Start-Control-Connection-Request

SCEP

Simple Certificate Enrollment Protocol

SCR

sustained cell rate

SCSI

small computer system interface (abbreviation pronounced “ scuzzy” )

SDH

Synchronous Digital Hierarchy

SDRAM

synchronous dynamic random access memory

SDSL

symmetric digital subscriber line

SDU

service data unit

SDX

Service Deployment System (formerly SSC)

SEF

severely errored framing

SES

severely errored second

SFP

small form-factor pluggable transceiver

(S,G)

source (S) of the multicast packet and
the destination multicast group address (G)

SHA

Secure Hash Algorithm

SIP

SMDS Interface Protocol

SLA

service level agreement

SLARP

Serial Line Address Resolution Protocol

SM

Service line module

SMF

single-mode fiber

SMM

switch management module

SNAP

Subnetwork Access Protocol; subnetwork attachment point

SNI

SMDS network interface

SNMP

Simple Network Management Protocol

SNPA

subnet point of attachment

SNTP

Simple Network Time Protocol

SODIMM

small outline dual inline memory module

SONET

Synchronous Optical Network

SPD

security policy database

SPF

shortest path first

SPI

security parameter index

SPQ

strict-priority queues

SPVC

soft permanent virtual circuit

SQL

Structured Query Language

SRP

switch route processor

SRT

source-rooted tree

SSC

Service Selection Center (no longer used; see SDX)

SSH

Secure Shell

SSN

short sequence number

STM

Synchronous Transport module

SVC

switched virtual circuit

S-VLAN

stacked virtual local area network

SYN

synchronize (bit)

T

 

TAC

Technical Assistance Center

TACACS

Terminal Access Controller Access Control System

TC

transmission convergence

TCP

Transmission Control Protocol

TE

traffic engineering

TFTP

Trivial File Transfer Protocol

TIP

terminal interface processor

TLV

type-length-value

ToS

type of service

TPID

Tag Protocol Identifier

TSM

Tunnel Service line module

TTL

time-to-live

TU

tributary unit

TUG

tributary unit group

TX

transmit

U

 

U

unit of measurement for rack-mounted equipment (a U is 1.75 in., or 4.44 cm)

UBR

unspecified bit rate

UDP

User Datagram Protocol

UI

user interface

UL

Underwriter Laboratories

UMTS

universal mobile telecommunications system

UNI

user-network interface (ATM usage); user-to-network interface

UPC

user parameter control

URL

Uniform Resource Locator

USM

user-based security model

UTC

Coordinated Universal Time

V

 

VAC

volts alternating current

VBR

variable bit rate

VBR-NRT

variable bit rate, non–real time

VBR-RT

variable bit rate, real time

VC

virtual circuit (or connection)

VCC

virtual channel connection

VCCI

Voluntary Control Council for Interference

VCD

virtual circuit descriptor

VCI

virtual channel identifier

VDC

volts direct current

VDSL

very-high-bit-rate digital subscriber line

VLAN

virtual local area network

VoIP

voice over Internet Protocol

VOQL

virtual output queue length

VP

virtual path

VPC

virtual path connection

VPI

virtual path identifier

VPN

virtual private network

VR

virtual router

VRF

VPN routing and forwarding instance

VRID

virtual router identifier

VRRP

Virtual Router Redundancy Protocol

VSA

vendor-specific attribute (RADIUS)

VT

virtual tributary

VTS

VPN Tunnel Server

vty

virtual terminal

W

 

WAN

wide area network

WAP

wireless access point

WEP

Wired Equivalent Privacy

WFQ

weighted fair queuing

WINS

Windows Internet Name Service (Microsoft)

WLAN

wireless local area network

WLL

wireless local loop

WRED

weighted random early detection

WRR

weighted round-robin

X

 

xDSL

combined term used to refer to ADSL, HDSL, SDSL, and VDSL

XFP

10-gigabit small form-factor pluggable transceiver