Figure 129: M20 Router Power Supplies - Juniper M Series Monitoring And Troubleshooting Manual

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M Series and T Series Routers Monitoring and Troubleshooting Guide

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M40 Router Power Supplies

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 129: M20 Router Power Supplies

M20 router rear

Power supply A

Power supply B

Checklist for Monitoring Power Supplies on page 273

The M40 router can use either AC or DC power. Two load-sharing power supplies install

into the bays located at the bottom rear of the chassis. As viewed from the rear of the

chassis, the supply on the left is referred to as supply

Figure 130 on page 281

are installed in the chassis.

The power supplies are fully redundant. When both power supplies are operational, they

automatically share the electrical load. If one power supply stops functioning for any

reason, the remaining power supply instantly begins providing all the power the router

needs for normal functioning, and can provide full power indefinitely.

DC power supply

AC power supply

and the supply on the right as

shows the M40 router power supplies and where they