AT&T System 75 Wiring Diagram page 264

Installing External Ringing
Requirements
Figure 4-39 shows the connections for external ringing, which is
provided by a device, such as a gong, chime, or bell, connected to an
information outlet. The switch side of the cross-connect field is
connected to a TN742 or TN769 analog line circuit pack located in a port
carrier. The TN742 or TN769 circuit pack contains eight ports.
A maximum of 3 devices can be connected to one TN742 or TN769
circuit pack port.
Installation
Install ringing device as follows:
1.
Determine port assignment of Call Answer From Any Voice Terminal
(CAAVT) feature from Console Parameters Form:
EXAMPLE: Port Number
2.
Install patch cord/jumper wires at cross-connect field.
3. Mount the ringing device at location specified on the External
Ringing Device Worksheet.
4.
Connect a 2-pair line cord (modular plug at one end) from the
information outlet to the ringing device (Figure 4-39).
5. Connect red (R) and green (T) leads to the ringing device.
6. Administer per AT&T System 75 and System 75 XE—Implementation
( 5 5 5 - 2 0 0 - 6 5 1 ) a n d AT&T System 75 and System 75
XE—Administration (555-200-500).
Miscellaneous Wiring Installation
B 02
Carrier Slot Circuit
01
4-67