AT&T 75 Wiring Manual page 529

Trunk/Auxiliary Field Connections—Terminals Used for Emergency Failure Transfer and
as Normal Extensions
6 . At Trunk/Auxiliary Field, run and connect pair of wires between PWR terminals
on the yellow emergency transfer connecting block to EM TRANS RELAY PWR
terminal (see Figure 4-67).
7 .
Run and connect CO trunk leads from the green field to TC terminals on the yellow
emergency transfer connecting block for each trunk.
8 .
Run and connect CO trunk circuit leads from the green field to TK terminals on
the yellow emergency transfer connecting block for each trunk.
9 . Run and connect voice terminal leads from the purple analog line board row to LC
terminals on yellow emergency transfer connecting block for each terminal.
10. Run and connect the ST terminal leads on the yellow emergency transfer
connecting block for each emergency transfer terminal to the terminal appearance
in the purple Trunk/Auxiliary Field.
11.
Connect the terminal appearance in the purple field to the blue or white Station
Distribution Field.
66-TYPE HARDWARE
4-103