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However, before a device without a TEI can answer a broadcast (to answer an incoming

call, for instance), it must request and receive an address in the normal way.

Summary

In this section you learned:

• ISDN devices need to have unique addresses

• These addresses are known as TEIs

• An address is nothing to do with the telephone number

• PRI lines permit only a single device at address TEI 0

• BRI lines can have either fixed or dynamic address assignment

• Fixed address lines permit only one device

• Dynamically assigned lines can have up to eight TEIs

• Mixing TEI assignment types can result in communication failures

Q/A

1. How many devices can be connected to a standard BRI line?

Eight devices may be connected to a standard ISDN Basic Rate Interface.

2. What are the two ISDN device addressing methods?

The two types of device addressing in ISDN are known as:

Fixed Addressing and Dynamic Addressing

3. A device is configured for automatic TEI. What is its address immediately after being switched on - before

it starts communicating with the network?

At this point, the device has no address - it will make a request to the network and the address will be

dynamically allocated.

4. In practice, what is the maximum number of devices that may be connected to a BRI which expects a fixed

TEI?

Only one device may be connected to a fixed TEI address ISDN line.

5. What is the significance of the TEI in B channel communication?

If the device is configured for one type of addressing and the network is expecting another type of

addressing, then successful B channel connections will not be possible because the device will never

initialise.

6. What address does an ISDN PRI line always use?

A Primary Rate line will always have the fixed address of zero.

7. Why does there need to be a broadcast TEI?

A broadcast address is necessary when the network needs to communicate with all the devices connected

to an ISDN line.

The typical example of the need for this would be to signal to all devices that there is an incoming call to be

answered.

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Eicon Networks ISDN NT1 Especificaciones Pagina 32