JUNOS Internet Software Network Operations Guide: Hardware
226 ! Understanding Power Supplies
M160 Router Power Supplies
The M160 router uses DC power. Two load-sharing, pass-through power supplies are
located at the bottom rear of the chassis. Figure 91 shows the 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.
Figure 91: M160 Router Power Supplies
Power
supplies
B/PEM1
A/PEM0
M160 router
Original DC power supply
1767
CB ON
CB OFF
OUTPUT OK
NO A IRFLOW
PEM
SELF TEST
Enhanced DC power supply
CB ON
TURN OFF CIRCUIT
BREAKER BEFORE REMOVING
OR INSERTING PEM.
INSERT PEM THEN
TURN OFF CIRCUIT
BREAKER AFTER 1 MINUTE.
ENHANCED PEM
CAUTION
CB OFF
OUTPUT OK
PEM
SELF TEST
TIGHTEN THESE SCREWS FIRST
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