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Table 2: Minimum Required Number of Power Supplies (continued)

2AC – low lineMX240

1 (only 1 zone)DCMX240

2AC – high lineMX480

3AC – low lineMX480

1 minimum per zoneDCMX480

1 minimum per zoneACMX960

1 minimum per zoneDCMX960

Upgrading the MX240 and MX480 AC Power Supplies

NOTE: Junos OS Release 10.0 R2 is required to support the MX240 and

MX480 AC and DC high capacity power supplies, and the MX960 AC

high-capacity power supplies. Junos OS Release 10.2 R1 is required to support

the MX960 DC high-capacity power supplies.

NOTE: During the upgrade process, the MX Series router can simultaneously

run existing and high-capacity power supplies. However, it is recommended

to upgrade all power supplies to high-capacity power supplies.

Removing the MX240 and MX480 AC Power Supplies

NOTE: The minimum number of power supplies must be present in the router

at all times.

CAUTION: To maintain proper cooling and prevent thermal shutdown of the

operating power supply unit, each power supply slot must contain either a

power supply or a blank panel. If you remove a power supply, you must install

a replacement power supply or a blank panel shortly after the removal.

NOTE: After powering off a power supply, wait at least 60 seconds before

turning it back on.

Upgrading MX240, MX480, and MX960 3D Universal Edge Router Power Supplies and Fan Trays

Juniper MX240 - UPGRADING User Manual

Questions and Answers: