AT&T System 75 Wiring Diagram page 253
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Also See for System 75:
- Wiring manual (593 pages) ,
- User manual (103 pages) ,
- User manual (45 pages)
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CHAPTER 4. STATION WIRING
PART OF 66-TYPE
CONNECTING BLOCK
ASSOCIATED WITH
CO TRUNK
CIRCUIT PACK
GND
GND
PART OF 66-TYPE
CONNECTING BLOCK
ASSOCIATED WITH
EMERGENCY
TRANSFER TERMINAL
Figure 4-32. Connections at Trunk/Auxiliary Field Equipped with
66-Type Hardware for Telephone Used Only for Emer-
gency Transfer (Ground Start Trunks)
4-56
(TN747)
PART OF 66-TYPE
CONNECTING BLOCK
ASSOCIATED WITH
CENTRAL OFFICE
PART OF 66-TYPE
CONNECTING BLOCK
ASSOCIATED WITH
AUXILIARY
CONNECTOR
PART OF 66-TYPE
CONNECTING BLOCK
ASSOCIATED WITH
Z1A EMERGENCY
TRANSFER UNIT
TC
LEADS
TK
ST
GRD
-48V
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