Page
12 of 40
Issue 2
13/12/99
PETS-2 Crossing Telephone System
QUICKFIX INSTALLATION HANDBOOK
12
to direct the cables to the wall. Right angle connector cannot use the more conventional
screw lock arrangement, and these connectors (all three) are retained in place by means of
a Connector Retention bracket. The connectors have the following functions:
1. 9 pin ‘D’ connector - power supply input and mains/charger alarm.
2. 25 pin ‘D’ connector - isolated telecommunications interfaces, i.e. transmission circuits.
3. 50 pin ‘D’ connector - all other PETS circuits, e.g. crossing telephones, etc.
Connectors 2 & 3 above are pre-wired to a Junction Box.
4.2.2 Item 2 - Connector Retention bracket
The photograph (Fig. 1) does not show this bracket. This bracket fits onto the Connector
Plate using the middle two screws, the upper screw is identified in the photograph. This
retention bracket has a series of forms to apply pressure at the rear of each ‘D’ connector
shell. As the bracket is fixed into position, by tightening the two fixing screws, the ‘D’
connectors become locked and fully mated.
4.2.3 Item 3 - Frame retention bolts
Shown in the photograph (Fig. 1) are the two left side retention bolts. The entire inner card
frame is removable from the outer casing. The two M6 hexagonal bolt heads at each side
secure the frame within the case. These bolts must not be removed unless the procedure
described in section 5.4 is followed.
4.2.4 Item 4 - Right hand access plate
The right hand access plate is equipped with a series of 20mm knockouts. This plate is not
usually required for standard installations. It has been retained in PETS 2 to allow access to
the right hand side of the frame and the motherboard. The right hand side of the case, and
this plate, cannot be seen in the photograph (Fig. 1)
4.2.5 Item 5 - Front panel
The front panel has a polyester membrane laminated onto an aluminium backing plate. This
Polyester membrane also serves as a label to identify the functions of the PETS 2 Signal
Box Unit. The front panel is secured to the internal card frame by means of the four button
head Allen Key M4 screws at the front. The following aspects of the front panel are of
particular note:
a) CALL buttons - The Signal Box Unit is equipped with a single Line Card, as standard.
The remaining CALL buttons allocated to Lines 2,3 & 4 have a blanking plug fitted to the
inside of the front panel, thereby preventing movement of the Polyester membrane in the
unused locations. The blanking plug will be removed in case of installing additional line
cards.
