BT Versatility User Manual download pdf (Page 20)

BT Versatility

Installation and Maintenance Manual

System ISDN settings

The system can be configured with 8 Basic Rate ISDN interfaces. Half of these can be configured for

internal

S-bus operation.

The second interface on the CCU and each of the Ports Modules can be programmed as S-bus interfaces

for ISDN to-the-desk.

interface termination

An ISDN bus must be terminated twice, once at the start and once at the end of the bus. The Network

Terminating Equipment (NTE) will provide the termination at the start of the bus. The end termination is

also provided by the NTE if the BT Versatility is directly connected to one of the NTE RJ45 sockets.

If ISDN 2 extension cabling and sockets are provided between the NTE and the switch the end terminating

resistor will normally be provided by an ISDN type 2 RJ45 line jack.

In both of these cases BT Versatility T

interface does not require the terminating resistor to be connected

and the associated switches in the MDF associated with the T

interface must be set to OFF (Default).

NOTE:

In the case of structured cabling if no end termination is provided, the associated switches in the

MDF associated with the T

interface must be set to ON.

interface termination

An ISDN S-bus must be terminated twice, once at the start and once at the end of the bus. The BT

Versatility S

interface emulates the Network Terminating Equipment (NTE) and consequently is always

terminated with 100 ohm resistance. In this case the switches associated with the interface in the MDF

must be set ON.

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BT Versatility User Manual Page 20