Eicon Networks ISDN NT1 Dokumentacja Pobierz pdf (Strona 28)

It is therefore necessary for the user's own NT1 to be connected to reference point U. This

will be necessary if the user wishes to attach more than one device. He would have to use

equipment designed to operate on the S or T Reference Points.

Reference Point U is explicitly not defined in EuroISDN, because the NT1 is always

provided and permanently connected to the wires by the service provider.

Summary

In this section you have learned that:

• ISDN equipment is called Terminal Equipment

• There are two classes of TE: TE1 and TE2.

• TE1 is ISDN aware equipment (e.g. an ISDN telephone)

• TE2 equipment is not ISDN aware (e.g. an analogue telephone)

• A Terminal Adapter is the equipment required to connect TE2's to an ISDN network

• An NT1 is the termination of the network

• Reference Point S/T is on the user side of the NT1

• Reference Point U is the network side of the NT1

• In EuroISDN, the user connects to Reference Point S/T and the network provider

supplies the NT1

• In North America, the user connects to Reference Point U and has to provide the

NT1

Q/A

1. What are the two types of equipment that can be used on ISDN called?

The two types of equipment which can be connected to ISDN are called TE1 and TE2.

The TE stands for Terminal Equipment.

2. What is the essential difference between them?

Type TE1 is equipment that can be connected directly to the ISDN. For example an ISDN telephone.

Type TE2 is equipment that cannot be connected directly to the ISDN and requires a Terminal Adapter. For

example a PC.

3. What item of equipment would be required to connect a modem to ISDN?

A terminal adapter.

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Eicon Networks ISDN NT1 Dokumentacja Strona 28