PRACTICE 553-2201-183
2. DESCRIPTION
2.01 All versions of the
500/2500
line packs provide talk battery and
signaling for regular 2-wire common battery
SOO-type
(rotary dial),
2500-type
(DIGITONE*
dial) telephones and key telephone equipment.
The various special versions serve additional purposes as described in
Part 4.
2.02 The line circuit packs mount in a Peripheral Equipment
(PE)
shelf.
The circuits connect with the switching system and with the external
apparatus via an 80-pin connector at the rear of the pack. The pack is
318 mm (12.5 in) in height and 254 mm
(10
in) in depth.
2.03 The 80-pin connector plugs into an IO-line bus system on the back
of the PE shelf. These 80 bus lines feed into seven multi-pin
connectors. Seven connectors link the line circuits to the cross-connect
terminal;
ttio
faceplate connectors on the Peripheral Buffer link the PE
shelves to each other and to the Common Equipment
(CE);
and one
connector feeds power to the PE from the converter shelf.
2.04 Connection to the station apparatus is made at the
cross-connecting terminal, as shown in the following block diagram of
the line circuit connected to a
500/2500
telephone:
.-
:’ .
.
.._.
.
. .
..I
..;
:
:
.\:-
.
*
DIGITONE
is
a trademark of
Norlhern
Telecom
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