AT&T System 75 Wiring Diagram page 223

CHAPTER 4. STATION WIRING
* ACC PWR LEADS AT YELLOW FIELD, 346 BULK POWER SUPPLY, OR 329A POWER SUPPLY.
KS-22911, L1 POWER SUPPLY CAN BE USED IF ATTENDANT CONSOLE IS NOT EQUIPPED
WITH OPTIONAL SELECTOR CONSOLE.
Figure 4-15. Connections for Attendant Console
Power for two consoles can be provided by the switch cabinet through
an auxiliary cable connected to the trunk/auxiliary field. Whenever
possible, power for the primary attendant console should be provided
by the switch cabinet. This makes the primary console fully operational
during short (less than 10 seconds) power outages.
Note: The attendant console cannot be powered from the switch
cabinet on the System 75 XE.
Additional attendant consoles can be remotely powered by the 346 bulk
power supply or individual power units. Refer to Adjunct Powering
section in this chapter for details on remote powering from adjunct
power units located at satellite locations, site locations, or information
outlets.
Note: The 329A power unit should not be used as a source of
remote power for the attendant console. A KS-22911, L1 or 346A
power unit should be used.
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