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18 Power and cooling equipment
NT7D03AA Ringing Generator DC
System Hardware-All
Purpose-The
Ringing Generator DC operates from a nominal -48V DC
input and provides selectable AC ringing voltage outputs superimposed on
-48 VDC. The frequency and voltage options are-20/25/50 Hi and 70/80/86
VAC. It also supplies -150V DC Message Waiting lamp 500/2500 set
applications. The Ringing Generator DC mounts in the PE modules to the
right of the Peripheral Equipment Power Supply DC.
Quantity--One
Ringing Generator DC is used in each of the following,
when these DC modules support 500- or 2500~type analog sets:
-
Intelligent Peripheral Equipment Module (NT8D37DC)
-
Peripheral Equipment Module (NT8Dl3DC)
NT7D04AA CE/PE Power Supply DC
System Hardware-All
(DC versions)
Purpose-The
Common/Peripheral Equipment Power Supply DC converts
-48V DC 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 DC is used
in each of the following DC Modules:
-
Common/Peripheral Equipment Module (NT8D 11DC )
-
Remote Peripheral Equipment Module
m8D47DC)
NT7DlOAA Power Distribution Unit DC
System Hardware-All
Purpose-The
NT7DlOAA Power Distribution Unit DC distributes power
to the entire column. It is located in the rear of the pedestal. It houses five
circuit breakers (one for each Module and one for the Blower Unit) and the
System Monitor.
Equipment identification and ordering information 553-3001-154
.
.