beautypg.com

Isdn glossary – Siemens 70isdn User Manual

Page 106

background image

ISDN glossary

94

kap13.fm5

Profiset 70isdn, GB: A30853-X300-B501-3-7619

20.5.99

ISDN glossary

The ISDN glossary should help you understand the many

new terms and abbreviations relating to ISDN.

a/b port

Port between the TAE socket and analog terminals.

a/b converter

These devices are used to connect analog terminals, such as tele-

phone, telefax, answering machine or modem, to the digital ISDN tel-

ecommunications network. The a/b converter (a/b adapter) thereby

converts the analog signals into digital signals and controls the D

channel protocol.

APL

Public network termination point. The APL is the actual connection

point to the telecommunications network. The internal telecommuni-

cations connector (TAE socket) is attached to the APL.

B channel

The basic channel with a maximum transmission speed of 64 kBit/s.

Basic rate access

This is the ISDN basic rate access. It is the entry-level connection type

in ISDN and offers two B channels with 64 kBit/s and a control channel

with 16 kBit/s.

BZT

Abbreviation for "Bundesamt für Zulassung in der Telekommunika-

tion" (Federal German Bureau of Certification for Telecommunica-

tions). Terminals which have been tested and approved for connection

to the German Telekom network are assigned a BTZ number.

Call forwarding

Forward calls to another station.

Call waiting

If the line is busy, a connection request is signalled (acoustically or op-

tically) by a call waiting signal.

CAPI

Abbreviation for Common ISDN Application Programmable Interface.

CAPI is a standardised interface between the communication inter-

face and the protocol interface. Any ISDN application programs can

communicate with any ISDN adapter cards via the CAPI.

CCITT

Abbreviation for Comité Consultatif International Télégraphique et

Téléphonique which is an international consulting body for telegraphy.

The CCITT has changed over to the ITU. It publishes recommenda-

tions which are frequently viewed as standard in the international tel-

ecommunications industry.

CLIP

Abbreviation for Calling Line Identification Presentation and means

that the calling party’s number appears on the called party’s display.

COLP

Abbreviation for Connected Line Identification Presentation and

means the called party’s number appears on the calling party’s dis-

play.

D channel

Control channel, also known as the data channel, which is provided in

the ISDN basic rate access with 16 kBit/s and in the primary rate ac-

cess with 64 kBit/s. It is required in particular for connection setup and

cleardown.

Dial pulsing (DP)

The old signalling method in the analog telephone network, whereby

the signalling information is transmitted by interruptions on the line.

Increasingly replaced by dual-tone multifrequency signalling (DTMF).