Juniper MX2008 Hardware Manual page 223

The MX2008 DC power system provides power to the FRUs in the chassis (see
information about power). Each power system is made up of two DC PDMs, nine PSMs, ten MPCs, two
fan trays, eight SFBs, and two RCBs.
When calculating power requirements, be sure that there is adequate power for the system.
Table 95: MX2008 DC Power System Sample Configuration
Chassis Power
Configuration
2 PSMs, 2 RCBs, 8 SFBs,
and 2 fan trays (no line
cards installed)
10 Line cards
N+1 redundant system with
N+N redundancy for SFBs,
RCBs, and 1 out of 2 fan
trays.
Power Distribution Power Supply
Modules (PDMs) Modules (PSMs)
PDM 0 and 1 2 PSMs
PDM 0 and 1 5 PSMs
PDM 0 and 1 9 PSMs
Table 95 on page 223
Description
The power consumed by RCBs
and SFBs is 100 W each.
The power consumed by 2 RCBs
and 8 SFBs is 1 KW.
The power consumed by fan
trays 0 and 1 is 1.5 KW each.
The total Kilowatts of power
consumed is 4.0 KW.
Each line card consumes up to
1 KW. One PSM is needed for
every set of 2 line cards.
This provides N+N redundnacy
for critical FRUs (RCBs, SFBs,
and fan trays) and N+1
redundancy for line cards.
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