Extension Port (22); Central Bell; Doorstrike - BT Inspiration Installation & Maintenance Manual

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Extension Port (22)

This port is designed to work up to a distance of 2 kilometers away from the main unit and is approved for

connection of 2-wire external extensions using PTO network cabling. Extension 22 should be the only

extension using this cable

Cable limitations:

• 2-wire external extension = 2 kilometers maximum cabling distance or 3 dB at 1600 Hz.

• The cable route should not be exposed to high voltage surges (e.g. Lightning)

Note - These figures are assuming a cabling conductor size of 0.5 mm copper diameter.

It should be noted that the BT Inspiration is provided with a connector for a Central Bell. This is a single

pair on which ringing is supplied. The Central bell can be provided by running a cable pair from the Central

Bell IDC see position 7 on Base Motherboard 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.

The Doorstrike port provides a closed relay contact when in the operated condition. The relay contact is

designed for low voltage DC equipment and should not be used for any voltages greater than those specified

within the technical specification.

Note:

All internal extensions terminated within the customers premises should connect into standard line jack

units. When extension 22 is using the long line facility (Max. 2 Km from the CCU) an earthed line surge

protector should be fitted to the line.

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