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 0.5mm2 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 BT Versatility manual Options Module MDF Connections, Central Bell, External Extension, Cable limitations