AT&T System 75 Wiring Diagram page 121

Equipment Room Hardware And Cabling Installation
USAGE:
IDENTIFIES CONTROL CARRIER OUTPUTS (AUXILIARY) AND
AUXILIARY CIRCUITS
CODE NO:
222A
Figure 3-23. Auxiliary Circuit and Control Carrier Outputs
(AUXILIARY) Labels for 110-Type Terminal
Blocks—System 75 XE
Z1A EMERGENCY TRANSFER UNIT AND CONTROL CARRIER OUTPUTS
(AUXILIARY) LABELS
The labels shown in Figures 3-24 and 3-25 identify the leads and
connection point for –48 volt dc power to the Z1A emergency transfer
unit and the control carrier AUXILIARY connector outputs for System 75
and 75 XE, respectively. The top half of the labels identify the Z1A
emergency transfer unit and the bottom half of the labels identify the
control carrier AUXILIARY connector outputs. The control carrier
AUXILIARY connector outputs are the same as described for the
auxiliary circuit and control carrier outputs labels.
3-38