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terminal adapter : ウィキペディア英語版
terminal adapter

== ISDN ==

In ISDN terminology, a terminal adapter or TA is a device that connects a ''terminal'' (computer) to the ISDN network.
The TA therefore fulfills a similar function to the ones a modem has on the POTS network, and is therefore sometimes called an ISDN modem. The latter term, however, is partially misleading as there is no modulation or demodulation performed.
There are devices on the market that combine the functions of an ISDN TA with those of a classical modem (with an ISDN line interface). These combined TA/modems permit connections from both ISDN and analog-line/modem counterparts. In addition, a TA may contain an interface and codec for one or more analog telephone lines (aka ''a/b line''), allowing an existing POTS installation to be upgraded to ISDN without changing phones.
Terminal adapters typically connect to a basic rate interface (S0, sometimes also U0). On the ''terminal'' side, the most popular interfaces are RS-232 serial and USB; others like V.35 or RS-449 are only of historical interest.
Devices connecting ISDN to a network (e.g. Ethernet) commonly include routing functionality; while they technically include a TA function, they are referred to as (ISDN) routers.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
ウィキペディアで「terminal adapter」の詳細全文を読む



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