ISDN Glossary of Terms

BONDING

Bandwidth On Demand InterNetworking Group
A protocol used to combine multiple channels to increase bandwidth

BRI

Basic Rate Interface
2B+D ISDN access, as compared to Primary Rate service.

CAPI

CLID

Calling Line IDentification

Call Bumping

A process where a second data link is dropped for an incoming voice call.

DOSBS

Data over Speech Bearer Service

EKTS

Electronic Key Telephone System (Feature phone)

ETSI

European ISDN Standard

HDLC

High-level Data Link Control. Synchronous transfer protocol

IPX

Internet Packet eXchange, Novell's Netware protoicol

ISDN

Integrated Standard Digital Network

IXC

IntereXchange Carrier (long-distance company)

MAC

Medium Access Control, a layer of the IEEE802.3 specification which defines framing and error detection.

MPF

Multilink Packet Fragmentation. Splitting each packet and sending on both channels

NFAS

Non-Associated Facility Signaling

NI-1

National ISDN 1 (a standard)

NOS

Network Operating System

NT1

Network Terminating Unit
A device used to convert between the Telco's U-interface and the S/T interface. In Europe, the NT1 is usually owned by the phone company, in the USA it is commonly integrated into a terminal adapter.

POTS

Plain Old Telephone (Set|Service)

PRI

Primary Rate Interface, in the USA, 23B+D

PSTN

Public Switched Telephone Network

RBOC

Regional Bell Operating Companies

S/T

A six-wire ISDN connection, usually seen on the customer side of a NT1 interface box

SPID

Service Protocol Identifier

SS7

Signaling System 7
Provides out-of-band signalling

TA

Terminal Adapter
ISDN hardware with serial data interface

TEI

Terminal Endpoint Identifier

U interface

A two-wire ISDN interface
Used for wiring between the Central Office and customer premises.

X.25

mu-law

A Voice encoding standard