Terminaladapter

A terminal adapter (TA ) is a device that allows to connect a terminal to an interface, where it can not be operated directly. In the parlance is called usually ISDN terminal adapter meant.

ISDN terminal adapter

An ISDN terminal adapter converts the digital signals of the ISDN S0 port to the interface signals of the connected terminal and vice versa. In the ISDN reference model implements a terminal adapter between the R and the S- reference point. ISDN terminal adapters are available for almost any interface type. The type most frequently used is the terminal adapter a / b. In the adjacent image is the abbreviation UAE an ISDN jack meant ( universal connection unit ).

ISDN terminal adapter is available in different versions, eg as a small PBX with two or three analog ports. As a rule, one or more MSNs assigned and thus an individual call distribution are obtained each analog port. There are also NTBAs with built-in terminal adapter a / b (see starter ). In the most common default device responds to each signaled on the S0 bus call; in general, the terminal adapter can also be configured so that it only responds to certain multiple phone numbers.

Terminal adapter a / b

Called a terminal adapter a / b, as a / b converter or a / b adapter, has a terminal connection, one or more a / b interface (s) and allows the operation of analog devices (such as analog phone, fax, answering machine, modem) to an ISDN multipoint connection or S0 bus. Thus, it is possible to integrate conventional analogue telephones in ISDN.

A classic analog phone can be nearly extend to an ISDN phone in conjunction with a terminal adapter a / b. The advantages of an ISDN telephone (in particular the number display ), however, are only given if both devices CLIP support.

The terminal adapter a / b is called supplementary A / B, because the two leads of analog telephone lines, a and b are referred to (see a / b - interface).

Other terminal adapter

According to its advertising slogan "Everything over a network " provided by the German Federal Post Office for each of their offered services to a terminal adapter. In addition to the a / b adapter today, none of these devices has a more practical significance; part no longer exist, the transmission networks ( teletext, Datex- L).

  • Terminal Adapter V.24, V.24 or implementation of X.21bis
  • Terminal adapter teletext, the successor to the telex network
  • Terminal adapter X.21, implementation at the Datex -L- network with the different means of access
  • Terminal adapter X.25, the transition to the Datex -P network

TA for the teletex service

TA X.21 with SPV / WV

TA X.21 with manual option

  • ISDN
Integrated Services Digital Network Analogsignal Basic Rate Interface
22154
de