Connecting The Extensions - BT Inspiration Installation & Maintenance Manual

Connecting the extensions

Note - Only four wires per extension are connected at the CCU; spare wires must be neatly laid back away from
the connectors. To prevent cross-talk or interference, cable pairs should not be split or the spare wire of cable pairs
used.
Protection of the CCU and telephones against high voltage surges is recommended where extensions and
external cabling are likely to be subjected to induced high voltage surges such as lightning.
Analogues Extensions are numbered 20 to 37.
Run cable from the CCU to each extension telephone location. Pass the cable through the cable entry hole
in the CCU and terminate the extension wiring in accordance with he table below
CCU Function
pairs
A Speech
B Speech
C Data
D Data
Standard 4-Wire IDC Krone
A Speech - LJU Pin 2
B Speech - LJU Pin 5
C Data - LJU Pin 1
D Data - LJU Pin 6
Master LJU
Pin - Out
Pin 2
Pin 5
Pin 1
Pin 6
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