M20 Router Redundant Power Supplies

Two load-sharing, isolated power supplies are located at the bottom rear of the M20 router chassis.The router uses either AC or DC power. Figure 202 shows the M20 router power supplies and where they are installed in the chassis.

When the power supplies are installed and operational, they automatically share the electrical load. If a power supply stops functioning for any reason, the remaining power supplies instantly begin providing all the power the router needs for normal functioning, and can provide full power indefinitely.

NOTE: Mixing AC and DC power supplies is not supported. The two power supplies must be either both AC or both DC. When two power supplies are installed, at least one Routing Engine and one FPC must also be installed for both power supplies to power on. In the absence of this minimum load, only one power supply starts. (The router powers and on and operates correctly with one power supply, but without the redundancy benefit of having a second power supply installed.)

Figure 202: M20 Router Redundant Power Supplies