Eicon Networks ISDN NT1 Spécifications télécharger pdf (Page 27)

Reference Point T is on the user's side of the network termination and allows a single TE

or TA to be connected.

Reference Point S allows more than one TE or TA to be connected. It only exists for Basic

Rate ISDN.

In this configuration, Reference Point S and Reference Point T are effectively in the same

place. The only distinction is the number of devices attached and so this reference point is

often referred to as S/T.

The S-bus

The passive bus illustrated below is an example of Reference Point S. For this reason, it is

often known as an S-Bus. This is the normal configuration for EuroISDN. Up to eight

devices can be connected to the S- Bus, any two of which can be be active

simultaneously.

The location of the U interface

In North America (and some other countries), where the NT1 is not provided by the ISDN

service provider, the Reference Point U is used to define the end of the wires provided to

the user by the service provider. There is no international standard that defines Reference

Point U.

Only one Terminal Equipment may be attached to Reference Point U. The TE must be

designed to operate on Reference Point U.

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Eicon Networks ISDN NT1 Spécifications Page 27