M40E Power System Description; Figure 27: M40E Alarm Relay Contacts And Bits Input Ports - Juniper M40E Hardware Manual

M40e Multiservice Edge Router Hardware Guide
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M40e Power System Description

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Figure 27: M40e Alarm Relay Contacts and BITS Input Ports

M40e Chassis Description on page 8
M40e Router Physical Specifications on page 269
M40e Router Power Requirements on page 274
The M40e Multiservice Edge Router uses either AC or DC power. There are two
load-sharing, pass-through power supplies located at the bottom rear of the chassis, as
shown in "M40e Chassis Description" on page 8. The power supplies connect to the
midplane, which distributes power to router components according to their individual
voltage requirements. 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.
CAUTION: Mixing AC and DC power supplies is not supported and prevents
the router from booting. If two power supplies are installed, they must either
both be AC or both DC.
A circuit breaker box must be installed on a DC-powered router, whereas a
circuit breaker is incorporated into each AC power supply.
Power supplies are hot-removable and hot-insertable, as described in "M40e
Field-Replaceable Units (FRUs)" on page 157. To avoid electrical injury, carefully follow
the instructions in Disconnecting AC Power from the M40e Router and Disconnecting
DC Power from the M40e Router.
Copyright © 2010, Juniper Networks, Inc.