AT&T System 75, Wiring Diagram

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CHAPTER 2. HARDWARE (66/110-Type)
Table 2-D. Individual Power Supply Adjunct and Distance
Limitations
Power Unit
2012D with
248B Adapter
(18-volt ac)
KS-22911, L1
(48-volt dc)
329A*
(–48 volt dc)
Adjunct Limits
Wire
Gauge
One speakerphone
or headset only
24
One digital module plus
24
speakerphone or headset
One digital module plus
24
speakerphone or headset
Two digital modules plus
24
speakerphone or headset
Three digital modules plus 24
speakerphone or headset
Distance
Feet
150
300
500
350
250
* The 329A should not be used to power attendant consoles.
INDIVIDUAL POWER SUPPLY ORDERING INFORMATION
Description Comcode
2012D Transformer 102 600 517
248B Adapter 102 802 103
KS-22911, L1 Power Unit 403 242 639
329A Power Unit
103 873 998
When more than one individual power supply is at the equipment room
or at a site or satellite location, an ac power strip (Figure 2-24) must be
installed to accommodate the various sizes of power supplies.
Note: A 543A power unit (Comcode 104 034 541) may be required
for inrush protection for a 20 amp 120-volt ac line serving multiple
329A power units. Contact your PSC for details. Most multiple
powering requirements should be served by the 346 modular bulk
power supply.
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