Issue 3 June 2000
4-1
4
Power
4
Overview
4
This chapter describes the powering options for the DDM-2000 FiberReach
Multiplexer. power options information is provided first for the wideband shelf and
then the narrowband shelf.
Introduction
4
The DDM-2000 FiberReach Multiplexer can be powered from a variety of power
sources. The most common powering method is the nominal
−
48 V DC power
available in telecommunication facilities.
Using commercially available 60 V AC or 120 V AC power converters,
−
48 V DC
for FiberReach can be provided.
Wideband Shelf
−
48 V Battery
Powering
4
The DDM-2000 FiberReach Multiplexer wideband shelf uses on-board power
conversion, eliminating the need for slots for bulk power converters. Two
independent
−
48 volt office power feeders (A and B) enter the shelf through
dangler cables (cables that come from the rear of the cabinet and “dangle” to
provide front access to rear connectors), fused at the user panel, and distributed
to the circuit packs. Power conversion is performed through modular power
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