AT&T System 75 Wiring Diagram page 283

CHAPTER 5. AUXILIARY EQUIPMENT INSTALLATION
Installation
Install loudspeaker paging access as follows:
1.
Determine port assignment of paging zone(s) from Loudspeaker
Paging Form:
EXAMPLE: Port Number
Identify carrier slot and label both ends of an A25D cable.
2.
Connect the A25D cable from the assigned port carrier slot to the
3.
25-pair connector on the auxiliary cabinet's ED-1E443-10
intra-connection panel (Figure 5-3).
4.
Connect an A25D (for 110-type hardware) or B25A for 66-type
hardware) cable from the 25-pair connector on the ED-1E443-10
intra-connection panel to the switch side of the cross-connect field
(Figure 5-3).
5. For 110-type hardware, install a yellow (auxiliary) label on the
110-type terminal block. For 66-type hardware, write the lead
designations on the 66-type connecting block with a felt-tipped pen.
Remove the cover from the 89A control unit, and install the control
6.
unit.
7. Make connections from the 89A control unit to the 110-type wiring
blocks on the ED-1E443-10 intra-connection panel (Figure 5-3).
8. On the 89A control unit:
Connect terminals PG1 and BSY1 to a -48V dc power supply.
Connect a 2012D transformer to terminals AC1 and AC2.
Install the cover on the 89A control unit.
9.
10. At the cross-connect field, install patch cord/jumper wires as
required.
11. Install loudspeaker equipment per the manufacturer's instructions.
12. At the information outlet, connect a 2-pair line cord (modular plug at
one end) and route it to the loudspeaker equipment (Figure 5-3).
5-10
02
01
B
Carrier Slot Circuit