Juniper M Series Monitoring And Troubleshooting Manual page 659

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M160 Router Redundant Power Supplies

The M160 router uses either AC or DC power. Two load-sharing, pass-through power

supplies are located at the bottom rear of the chassis.

M160 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.

Mixing AC and DC power supplies is not supported and prevents the

router from booting. If two power supplies are installed, they must be either

both AC or both DC.

A circuit breaker box must be installed on a DC-powered router, while a

circuit breaker is incorporated into each AC power supply. Converting the

router from AC to DC power or vice versa involves removing or installing

the circuit breaker box. Only authorized service personnel should perform

the conversion: this manual does not include instructions.

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 on and operates correctly with one power supply, but without the

redundancy benefit of having a second power supply installed.)

Chapter 30: Monitoring Redundant Power Supplies

Figure 305 on page 616