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Power and cooling equipment 19
Quantity-One
p&pedestal/column in DC systems
NT7D12AA
Rectifier Rack
System
Hardware-21/51/61
(DC versions)
Purpose-This
is a 48.3-cm (19-in.) open relay rack which is
approximately 1.5 m (5 ft) high. It supports up to three NT6D52AA
Rectifiers in a single column.
Quantity-One rack per every three
NT6D52.44
Rectifiers, up to a
maximum of three racks per system
NT7D14AA
CE/PE
Power Supply AC
System Hardware-All
Purpose-The Common/Peripheral Equipment
Power Supply AC converts
208/24OV AC to +5V, +8.5V, +15V, +12V,
48V,
and -150V DC voltages
used to power peripheral and common equipment, supply talk battery, and
light Message Waiting lamps on 500/2500 sets. It provides selectable AC
ringing voltage outputs superimposed on -48 VDC. The frequency and
voltage options are 20/‘25/50 Hz and 70/80/86 VAC. It is located to the left
of the module, in the slot labeled “CE/PE Pwr Sup”.
Quantity-One
Common/Peripheral Equipment Power Supply AC
isused
in each of the following AC modules:
-
Common/Peripheral Equipment Module (NTSDl 1AC)
-
Remote Peripheral Equipment Module (NT8D47AA)
NT7D15AA
System Monitor
-
System option
21A
System Hardware-System
option 21A
Purpose--The
NT7DlSAA
System Monitor
-
System option 21A provides
an interface to communicate and monitor the NT7D14AA CE/PE Power
Supply AC, the CPU, and the thermal switches. In the event of failure, the
System Monitor
-
System option 21A is notified and the appropriate alarm
is set. A system alarm LED located below the top cap lights to indicate
CPU failure.
Quantity-One per
system
Equipment identification and ordering information 553-3001-154