Avaya Configuring Dial Services Uživatelský manuál stáhnout pdf (Strana 112)

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Configuring Dial Services

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117353-B Rev. 00

Reference Points

Reference points, also called interfaces, bring two functions together. A reference

point may be physical, along the ISDN line, or merely a conceptual point where

functions merge. There are four main reference points in an ISDN network:

• R reference point -- The point between the non-ISDN device and a terminal

adapter. It is the boundary between your equipment and the ISDN network.

• S reference point -- The point between the terminal equipment and the

switching device at your premises.

• T reference point -- The point between your switching device and the

subscriber side of the local loop, that is, the wire between your phone and the

phone company’s central office.

• U reference point -- The point between the NT1 (where the phone company’s

line ends at your premises) and the phone company’s central office. It is where

the subscriber side and network side of the local loop meet.

This point is different in North America than in Europe. In North America, the

subscriber side of the local loop includes the NT1, so the U point is further out

on the network. In Europe, the NT1 is part of the service provider’s side or

network side of the local loop, so the S/T point is where the subscriber and the

network meet.

Note:

Any device that can connect to an S reference point can connect to a

T reference point, because the devices are the same electrically.

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