Options Module Mdf Connections; Central Bell; External Extension - BT Versatility Installation And Maintenance Manual

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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.

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 2 and 5.

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. Extension 52 should be the only extension using this cable.

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

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.

diameter telephone wiring.

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