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ISDN glossary
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
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
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