AT&T System 75 Wiring Diagram page 257

CHAPTER 4. STATION WIRING
PART OF 66-TYPE
CONNECTING BLOCK
ASSOCIATED WITH
CENTRAL
OFFICE LEADS
Figure 4-35. Connections at Trunk/Auxiliary Field for Optional DID
Make-Busy Trunk—Z1A Emergency Transfer Unit
4-60
WHEN USING 66-TYPE HARDWARE
DID
MB
T K
S T
WHEN USING 11O-TYPE HARDWARE
100
DID
MB
1 PAIR OF
WIRES
PWR
LC ST
TK
IN-
ADS
PART OF 66-TYPE
CONNECTING BLOCK
ASSOCIATED WITH
Z1A EMERGENCY
TRANSFER UNIT
75
TO NETWORK
INTERFACE
FACILITY
TO
Z1A
EMERGENCY
TRANSFER
UNIT