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Connecting the extensions
2.1.8
For information the ringer equivalence number for 2+8 extension ports
is
4.
IJU 2/lA master jacks are required, one per extension. All extensions
irrespective of whether they are using an approved telephone or
System phone are 6-wire connected at the master jack.
Note
Only five wires are connected at the CCU; the sixth (pin
the wire must be neatly laid back away from the IDCs.
Extensions are numbered 20 to 27. Extensions must be connected in one
continuous block starting at 20, and there must be no gaps in the
numbering sequence that will leave an extension without a telephone.
Run 6-wire 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 the following table.
Table
2.1
CCU
CCU
Connecting parallel extensions
2.1.8.1
Additional IJUs can be connected to the master IJU of any extension
port using either serial or spur cabling .
Any approved secondary IJUs or socket doublers can be used for
connecting additional extensions to the master IJU, providing the
cabling wiring procedure and maximum REN value are the same as
paragraphs 2.1.7 and 2.1.8.
Note
System phones can not be paralleled with other System phones, 2-wire
telephones or sockets which are part of ancillary apparatus (refer to
paragraph 2.1.15 and Section 10.1,
TPU
1371Issue3(4/91)
to Master Jack Extension wiring
Extension
IDC
1
Green/White
2
Blue/White
Orange/White
4
White/Orange
5
White/Blue
6
White/Green
3)
Master jack
1
2
3
4
5
6
Statutory information).
Installation procedt.i.
is spare, and
IDC
Not used
_
2-6
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