363-206-305
Power
4-2
Issue 3 June 2000
converters located on the circuit packs. In each circuit pack, the two feeders are
diode ORed, fused, filtered, and regulated by the board-mounted power modules.
This provides the required redundancy in case of the loss of one feeder or one
fuse. Figure 4-1 shows the distribution schematic. The power converter located on
the OLIU circuit pack provides power to the DS1 and HDSL circuit packs. T1EXT
circuit packs use –48 volts from the backplane to provide line powering with 60mA
constant current source. Total power requirements for the wideband shelf are 40
watts for a typical configuration with a 1x7 protected DS1 interface. Total power
requirements for the wideband shelf are 65 watts for a typical configuration with a
1x7 protected T1EXT circuit packs.
Figure 4-1. DDM-2000 FiberReach Multiplexer Wideband Shelf Power Architecture
f
u
s
e
f
i
l
t
e
r
f
i
l
t
e
r
f
u
s
e
-48V
-48V
-48V
-48V
-48V
-48V
Diode OR of redundant power feeds is provided on each circuit pack.
in-service- upgrade/replacement of circuit pack in AUXCTL slot.
AUXCTL
SYSCTL
-48V
FNMAINLow Speed
+5.3V
+5.3V
+5V
*
*
An unfused -48V power feed directly to backplane power bus is provided to allow
DDM-2000 FiberReach Wideband Shelf
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