Juniper MX2010 Hardware Manual page 218

page 116). Each set of power cables powers a single DC PSM and is capable of delivering 2500 W of power
if 80-A feeds are connected. If feeds that connect to one PDM fail in a redundant configuration, the other
feed starts to provide full power.
Figure 73 on page 198 shows a typical DC source cabling arrangement.
Figure 73: Typical DC Source Cabling to the Router
DC power supply on MX2010
Chassis grounding point
(central office ground)
All DC PSMs in a subsystem share the load. If one PSM fails in a redundant configuration, the remaining
PSMs provide power to FRUs. Up to nine PSMs might be required to supply power to a fully configured
router. A portion of power from each zone is reserved to power critical FRUs. These FRUs allow the system
to operate even if power to a complete zone fails.
CAUTION:
The power source cables might be labeled (+) and (-) to indicate their polarity. There
is no standard color coding for DC power cables. The color coding used by the external
DC power source at your site determines the color coding for the leads on the power
cables that attach to the terminal studs on each PDM.
WARNING:
CAUTION:
drape where people could trip on them.
Central office
secondary DC
power distribution
Ground
window
Central
office ground
You must ensure that power connections maintain the proper polarity.
For field-wiring connections, use copper conductors only.
Power cords and cables must not block access to device components or
Rectifiers
Plant
controls
Batteries
Power plant and batteries
in same building
AC
198