Figure 135: M320 Router Power Supplies
The M320 router supports four power supplies. The AC power supplies are fully redundant.
If one power supply fails or is removed, the remaining power supplies instantly assume
the entire electrical load. Three power supplies can provide full power for as long as the
router is operational.
In the M320 router DC power supply configuration, the router has four DC power supplies,
located at the lower rear of the chassis in slots PEM0 through PEM3 (top to bottom).
The DC power supplies in slots PEM0 and PEM2 are load-sharing and provide power to
the Flexible PIC Concentrators (FPCs) in slots FPC3 through FPC7. The DC power supplies
in slots PEM1 and PEM3 are load-sharing and provide power to the FPCs in slots FPC0
through FPC2, Switch Interface Boards (SIBs), Control Boards, and Routing Engines. All
DC power supplies provide power to the fan trays.
NOTE: The DC power supplies in slots PEM0 and PEM1 must be powered by
dedicated power feeds derived from feed A, and the DC power supplies in
slots PEM2 and PEM3 must be powered by dedicated power feeds derived
from feed B. This configuration provides the commonly deployed A/B feed
redundancy for the system.
NOTE: Each power supply must be connected to a dedicated AC power feed
and a dedicated 15 A (250 VAC) circuit breaker.
Copyright © 2012, Juniper Networks, Inc.286
M Series and T Series Routers Monitoring and Troubleshooting Guide
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