BT Versatility User Manual download pdf (Page 37)

BT Versatility

Installation and maintenance Manual

Options Module MDF Connections

The options module is equipped with a stereo jack for an ‘external Music on hold’ input. Krone IDC

connectors are provided for the Central Bell and the External extension.

The Central bell and the external extension are cabled with extension cabling. They are connected with a

single pair a,b.

Central Bell

The Central Bell is cabled by running a cable pair from the central bell IDC on the Options Module to a

master line jack unit. Bells/tone callers can then be connected to the line jack unit or hard-wired to LJU

terminals 3 and 5.

External Extension

This port is designed to operate “long line “ extensions up to a distance of 2 kilometres away from the

main unit and is approved for connection of 2-wire external extensions using PTO network cabling.

Cable limitations

• 2-wire external extension = 2 kilometres maximum cabling distance or

3 dB at 1600 Hz.

• The cable route should not be exposed to high voltage surges, such as lightning.

Note: These figures assume the use of 0.5mm

diameter telephone wiring.

All Extensions should connect into standard line jack units. Extension cabling

should not be exposed to high voltage surges, (for example, surges induced by

lightning or neighbouring high current-carrying cables). If this is a possibility

external protection of the Main Equipment and Extensions using ‘earthed line

surge protectors’ is essential.

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BT Versatility User Manual Page 37