Terminal adapter

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A terminal adapter ( TA ) is a device that enables a terminal device to be connected to an interface on which it cannot be operated directly. In parlance, the term usually refers to the ISDN terminal adapter.

ISDN terminal adapter

Use of a terminal adapter a / b

An ISDN terminal adapter converts the digital ISDN signals from the S 0 interface into signals from the interface of the terminal to be connected and vice versa. In the ISDN reference model , a terminal adapter moves between the R and S reference points. ISDN terminal adapters are available for almost every type of interface. The most frequently used type is the terminal adapter a / b . In the picture is the abbreviation UAE an ISDN connection box meant ( U niversal- A nschluss- E nit).

ISDN terminal adapters are available in different versions, e.g. B. as a small telephone system with two or three analog ports . As a rule, each analog port, one or more MSN assigned, and thus an individual call distribution can be achieved. There are also NTBAs with a built-in terminal adapter a / b (see starter box ). In the most common basic setting, the device reacts to every call signaled on the S 0 bus ; In general, the terminal adapter can also be configured so that it only reacts to certain multiple subscriber numbers.

Terminal adapter a / b

A terminal adapter a / b , also known as a / b converter or a / b adapter , has one or more a / b interface (s) as a terminal device connection and enables the operation of analog terminal devices (such as analog telephones , telefax , answering machine , modem ) on an ISDN - multipoint connection or S 0 bus . This makes it possible to integrate conventional analogue end devices into ISDN.

A classic analog telephone can be expanded almost to an ISDN telephone in connection with a terminal adapter a / b . The advantages of an ISDN telephone (in particular the number display) are only given if both devices support CLIP .

The terminal adapter a / b has the suffix a / b because the two cores of analog telephone lines are designated with a and b (see a / b interface ).

Other terminal adapters

According to its advertising statement “Everything via one network”, the Deutsche Bundespost provided a terminal adapter for each of the services it offers. Apart from the a / b adapter, none of these devices has any practical significance today; In some cases the transmission networks (Teletex, Datex-L) no longer exist either.

  • Terminal adapter V.24 , implementation of V.24 or X.21bis
  • Terminal adapter Teletex , the successor to the Telex network
  • Terminal adapter X.21 , conversion to the Datex-L network with various access options
  • Terminal adapter X.25 , the transition to the Datex-P network

  • One of the first TA a / b

  • TA for the Teletex service

  • TA X.21 with SPV / WV

  • TA X.21 with manual option

literature

  • Volker Jung, Hans-Jürgen Warnecke (Hrsg.): Handbook for telecommunications. Springer Verlag, Berlin / Heidelberg 1998, ISBN 978-3-642-97703-9 .
  • Wolfgang Elsässer: ISDN and local networks. Friedrich Vieweg & Sohn Verlagsgesellschaft mbH, Wiesbaden 1995, ISBN 978-3-322-83076-0 .
  • Peter Welzel: Remote data transmission. 3rd revised and expanded edition, Friedrich Vieweg & Sohn Verlagsgesellschaft mbH, Wiesbaden 1993, ISBN 978-3-528-24369-2 .
  • Wolf-Dieter Haaß: Handbook of the communication networks. Introduction to the basics and methods of communication networks. Springer, Berlin Heidelberg 1997, ISBN 3-540-61837-6 .
  • Alexander Prosser: Standards in computer networks. Springer Verlag, Vienna 1993, ISBN 978-3-211-82430-6 .