Subsidiary connection (piggy-backing)
3.1
Subsidiary connection
{piggy-backing)
Before connecting
2+8
to a host PABX the approved maintainer should
be consulted.
2+8
may only be attached to P ABXs given in List C of the
DTI document
84011 I.
When the
2+8
is connected to a host PABX, it is a mandatory
requirement that locking bars
2A
or
3A
are fitted to extension wall
sockets serving extensions
20
and
21,
holding the telephone plugs
captive.
The
2+8
may be connected to a host PABX by connecting an extension
from the host P ABX to the exchange line port of the
2+8.
The connection
details are the same as those given in paragraph
2.1.9
for the exchange
line, except that for Exchange line read Host PABX.
It will be necessary to select the forward recall type for either Earth or
Time Break recall depending on the host PABX. This is selected by DIL
switch on the CCU PCB. See paragraph
2.1.13
and Figure
2.5. See
also
paragraph
2.1.14
for setting of the LKl and LK2 host PBX straps.
Note
If Earth Loop Recall is selected it is important that the polarity of the
exchange line
A
and B wire is correct or the recall facility may not work.
Exchange line
A
and B wires must be terminated as labelled on the
exchange line IDC terminals. See paragraph
2.1.9.
3-1
TPU
1371Issue3(4/91)
Summary of Contents for 2+8
Page 1: ...Installation and maintenance manual 2 8...
Page 2: ......
Page 36: ...Notes 10 2 Notes 10 3 TPU 1371Issue3 4 91...
Page 37: ...Notes TPU 1371Issue3 4 91 10 4...