Installing Emergency Transfer Units And Terminals - AT&T 75 Wiring Manual

110-TYPE HARDWARE
NOTE:
THE MAXIMUM CABLING DISTANCE FROM THE SWITCH CABINET
TO OUT-OF-BUILDING VOICE TERMINALS IS 6000 FEET (1828 M).
Figure 3-102. Connections for Each Group of Eight Out-of-Building Analog
Voice Terminals

Installing Emergency Transfer Units and Terminals

Requirements—Terminals
Emergency transfer capability is provided by a transfer unit mounted on the wall next to the
Trunk/Auxiliary Field.
Only 500- or 2500-type voice terminals can be used for emergency transfer. For R1V2 or
R1V3 systems, the 500-type and 2500-type terminals can also be used as normal extensions.
For R1V1 systems, the 500-type terminals are used when the central office has rotary dialing
service only and cannot be used as normal extensions. Emergency transfer capability may
be provided on Central Office (CO) and Wide Area Telecommunications Service (WATS)
trunks.
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