Eicon Networks ISDN NT1 Especificaciones descargar pdf (Pagina 48)

If you are connecting only one device to your BRI NT1, the cable can be as long as 1 km if

you are using Category 5 twisted pair.

In practice, if you really need to run a cable for this distance it would probably be safer to

re-site your NT1 closer to the equipment to be connected.

All NT1s have two sockets for devices, so you could add another device to the other

socket at a similar distance.

This form of wiring is known as point-to-point.

As many as eight devices can be connected to a BRI NT1, but the NT1 normally only has

two sockets. You must use some special wiring to connect more than two devices and

there are also rules about the maximum distances involved.

In this configuration, known as the short passive bus, the devices are randomly

distributed along the length of the cable. Each of the drop cables (between the main cable

and the device) may be as long as ten metres.

The total length of the main cable may not be longer than either 100 metres or 200 metres,

depending on the quality of the cable. Cable has a characteristic impedance, either 100Ω

or 200Ω. With the 100Ω cable, the maximum length is 100 metres, whereas with the more

expensive 200Ω cable, the maximum length can be 200 metres. The characteristic

impedance is usually quoted by the cable supplier.

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Eicon Networks ISDN NT1 Especificaciones Pagina 48