AT&T System 75 Wiring Diagram page 150

Equipment Room Hardware And Cabling Installation
TRUNK/AUXILIARY
POWER
CORD
CABLES RUN FROM SWITCH CABINET TO
TRUNK/AUXILIARY FIELD.
CABLES RUN FROM SWITCH CABINET TO
STATION DISTRIBUTION FIELD.
Figure 3-45. Cable Routing From Switch Cabinet to Cross-Connect
Field (Using Bottom Terminal Blocks)
Routing Cables Using 110-Type Terminal Blocks
Figures 3-46 and 3-47 show the cable routing pattern through the cable
slack manager for a single cabinet installation using connectorized
110-type terminal blocks with the connectors located at the top and
bottom of the terminal blocks, respectively. Cables are routed through
the cable slack manager in either the cabinet or wall troughs. When
needed, the two center troughs can be used.
Port cables are routed through the cabinet trough for parallel runs.
Station cables should use the wall trough. After the cabinet and wall
troughs are filled, use the center trough.
CROSSS-CONNECT
STATION DISTRIBUTION
CABLE SLACK CABLE SLACK
MANAGER MANAGER
NO. 1 NO. 2
SYSTEM
CABINET
(FRONT)
FIELD
CABLE SLACK
MANAGER
NO. 3
BUILDING
CABLES
3-67