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Figure 42: DC Power Supply Module (240 V China)
The DC power system is feed redundant. Each DC PSM can be connected to two separate feeds from
different sources that are used to provide feed redundancy. If two feeds are connected, PSM input power
will be drawn from the feed with the higher voltage present. There are two PDMs per power subsystem
capable of carrying nine feeds each. Connect feeds from one source to one PDM and feeds from the other
source to the second PDM of the power subsystem. The primary input of the PSM is a dual redundant
feed, INP0 and INP1. Both feeds are active during operation, but both feeds may or may not be providing
current. Move the input mode DIP switch to the on or off position to determine the power supply feeds
(see
Table 37 on page 101
the craft interface. Each PDM has an LED per feed indicating whether the feed is active or not, or whether
the feed is connected properly, see
on page
118.
Table 38: DIP Switch Positions on the DC PSM
Left Switch Position
Off
On
Off
On
and
Figure 41 on page
102). In addition, a PSM failure triggers the alarm LED on
"MX2008 Router DC (240 V China) System Electrical Specifications"
Right Switch Position
Off
Off
On
On
Input Source
None
Input 0 (INP0)
Input 1 (INP1)
Both Input 0 and Input 1
103
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