Figure 131: M40E Router Power Supplies - Juniper M Series Monitoring And Troubleshooting Manual

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M Series and T Series Routers Monitoring and Troubleshooting Guide

Figure 131: M40e Router Power Supplies

Documentation

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.)

Checklist for Monitoring Power Supplies on page 273