AT&T 75 Wiring Manual page 92

Z100-TYPE HARDWARE
Figure 2-47. Control Carrier Outputs (AUXILIARY Connector)—System 75 XE
Installing Trunk Cables Between Network Interface and System Cabinet
The trunk pairs installed by the local telephone company must be located on specific pin
assignments at the network interface so that they match the pin designations on the carrier
connectors located on the rear of the switch cabinet (see Table 2-F and Figures 2-48, 2-49,
and 2-50).
Cross-connecting the trunk leads is not recommended in the cable access panel except on a
very limited basis and when necessary for temporary maintenance (for example, one used
port bad on a trunk circuit pack and a good spare port available on another trunk circuit
pack).
2-66