22 DC power system description
Module to Module Harness
The Module to Module Harness provides the following:
-
The Module Feed provides the independent power feed to the Modules
above itself.
-
The Module Harness Feed provides the power feed to the Module
backplane Harness.
Module to Backplane Harness
The Module to Backplane Harness provides the power feed to the backplane
connector which in turn provides power to the DC Power Converters.
DC Power Converters
Three different DC Power Converters provide power to the Peripheral
Equipment, Common Equipment and Common/Peripheral Equipment
Modules. The Ringing Generator provides ringing voltage for Peripheral
Equipment Modules.
At each shelf, -48 V is received through the backplane distribution harness
and converted to the necessary voltages for the individual module. Switches
are located on each converter to provide for safe operation and easy
maintenance. With separate Module breakers located in the Pedestal PDU, the-
Module Power Distribution Unit (MPDU) is not necessary.
Power engineering 553-3001-l 52
C.