Eicon Networks ISDN NT1 Specifikace stáhnout pdf (Strana 51)

This also shows how you arrange the wiring for the short and long passive bus

configuration. If you also need the power supplies PS2 and PS3, you should include

conductors 1, 2, 7 and 8 as well.

Summary

In this section you have learned that:

• The NT1 is an integral part of the network in EuroISDN.

• The user provides the NT1 in North America.

• You can use most types of twisted pair cabling for a BRI.

• The type of cabling used for a PRI is not consistent and depends upon the local

provider

• For a BRI you can use point-to-point wiring, or point-to-multipoint wiring, as either a

short passive bus or an extended passive bus.

• A BRI may be able to provide a power supply through the interface.

• Any cable over a certain length needs to be terminated at both ends.

Q/A

1. What is the purpose of the switch that all NT1s have?

This switch controls termination and should be activated if any of the cables being used to attach devices to

the ISDN is greater than 75m long.

2. If none of the equipment connected to an NT1 requires a power supply through the interface, do I need to

attach the NT1 to the mains?

No - there is sufficient power within the ISDN standard to power the NT1 itself.

3. How many devices may be connected to a BRI?

Up to eight devices may be connected to a standard Basic Rate interface.

4. How many devices may be connected to a PRI?

Only one device may be connected to a Primary Rate interface.

5. What kind of cabling is used for a BRI?

Normally, it will be the same as Category 5 cabling with an RJ45 jack.

6. What kind of cabling is used for a PRI?

The cabling standards for the Primary Rate interface are not as specific as they are for Basic Rate, and they

will therefore vary according to the local ISDN supplier.

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Eicon Networks ISDN NT1 Specifikace Strana 51