AT&T System 75, Wiring Diagram

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Figure 4-24.
Figure 4-25.
Figure 4-26.
Figure 4-27.
Figure 4-28.
Figure 4-29.
Figure 4-30.
Figure 4-31.
Figure 4-32.
Figure 4-33.
Figure 4-34.
Figure 4-35.
Figure 4-36.
Figure 4-37.
Figure 4-38.
Figure 4-39.
Connections for Digital Out-of-Building Voice
Terminals
574-5 Power Transfer Unit Option Switches
Connections at Trunk/Auxiliary Field Equipped with
110-Type Hardware for Telephone Used Only for
Emergency Transfer
Connections at Trunk/Auxiliary Field Equipped with
66-Type Hardware for Telephone Used Only for
Emergency Transfer
Connections at Trunk/Auxiliary Field Equipped with
110-Type Hardware for Telephone Used for
Emergency Transfer and as Normal Extension
Connections at Trunk/Auxiliary Field Equipped with
66-Type Hardware for Telephone Used for
Emergency Transfer and as Normal Extension
Connections at Trunk/Auxiliary Field for DID
Make-Busy Trunk—574-5 Power Transfer Unit
Connections at Trunk/Auxiliary Field Equipped with
110-Type Hardware for Telephone Used Only for
Emergency Transfer (Ground Start Trunk)
Connections at Trunk/Auxiliary Field Equipped with
66-Type Hardware for Telephone Used Only for
Emergency Transfer (Ground Start Trunks)
Connections at Trunk/Auxiliary Field Equipped with
110-Type Hardware for Telephone Used for
Emergency Transfer and as Normal Extension
(Ground Start Trunks)
Connections at Trunk/Auxiliary Field Equipped with
66-Type Hardware for Telephone Used for
Emergency Transfer and as Normal Extension
(Ground Start Trunks)
Connections at Trunk/Auxiliary Field for Optional
DID Make-Busy Trunk—Z1A Emergency Transfer
Unit
Ground Wiring Example (Three Telephones Used
Only for Emergency Transfer)
Ground Wiring Example (Five Telephones Used for
Emergency Transfer and as Normal Extensions)
Ground Start Key Installation
Connections for External Ringing or Queue
Warning Indicator
4-44
4-46
4-47
4-48
4-49
4-50
4-51
4-55
4-56
4-57
4-58
4-60
4-63
4-65
4-66
4-68
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