AT&T 75 Wiring Manual page 363

Trunk/Auxiliary Field Connections—Terminals Used for Emergency Failure Transfer and
as Normal Extensions
7 . At Trunk/Auxiliary Field, run and connect pair of wires between PWR terminals
on the yellow emergency transfer row to EM TRANS RELAY PWR terminal (see
Figure 3-108).
Run and connect CO trunk leads from the purple field TC terminals on the yellow
8 .
emergency transfer row for each trunk.
9 . Run and connect CO trunk circuit leads from the green field to TK terminals on
the yellow emergency transfer row for each trunk.
10. Run and connect voice terminal leads from the purple analog line board row to LC
terminals on the yellow emergency transfer row for each terminal.
11. Run and connect the ST terminal leads on the yellow emergency transfer row for
each emergency transfer terminal to a separate row in the purple Trunk/Auxiliary
Field.
12. Connect this purple field row to the terminal appearance in the blue or white field
Station Distribution Field.
13. If ground start must be provided, do step 14; otherwise, go to step 15.
14. Run and connect two wires from ground terminals to the third pair for each
emergency terminal appearance on the purple Trunk/Auxiliary row created in step
12. Loop the wires from the first appearance to the last if enough ground
terminals are not available (see Figure 3-111).
110-TYPE HARDWARE
3-147