22 Power and cooling equipment
NT8D29AA Common Equipment Power Supply AC
System Hardware--System
option
51/61/71
Purpose-The
Common Equipment Power Supply AC is used in the
common equipment modules in AC systems. It is located in the first slot on
the left in the module labeled “CE Pwr Sup”. It converts 208/24OV AC to
+5V
and
f12
V DC to provide all required voltages for CE and network
circuit cards.
Quantity-One Common Equipment Power Supply AC is used in each of
the following AC Modules:
-
CPU Module
(NT8D34AA)
-
Network Module
(NT8D35AA)
-
CPU/Network Module
(NT6D39AA)
Two Common Equipment Power Supply AC is used in the Meridian Mail
Module
(NT6D44AC).
NT8D39AA Power Failure Transfer Unit
System Hardware-All
Purpose-Provides an interface between CO lines, Private Branch
.-
Exchange (PBX), and 500/2500 phones (rotary dial and pushbutton). The
Power Failure Transfer Unit allows eight phones to be connected to the CO
lines in the event of a PBX power failure or malfunction. The Power Fail
Transfer Unit is invisible to the switch and CO lines during normal PBX
operations.
The Power Fail Transfer Unit is approximately 22.8 cm (9 in) long by 22.8
cm (9 in) wide by 8.8 cm (3.5 in) deep. It is screw-mounted to the
Distribution Frame and connects to the Main Distribution Frame and switch
by two 25-pair cables.
Note:
The Power Fail Transfer Unit is not recommended for use in
international applications.
Quantity-One
per system
Equipment identification and ordering information 553-3001-154
C.