Upgrading The Mx240 And Mx480 Ac Power Supplies; Removing The Mx240 And Mx480 Ac Power Supplies - Juniper MX SERIES - FAN TRAY UPGRADE REV1 4-2010 Manual

supply. Attach power feeds and power up the power supply. Remember to turn on
both switches while upgrading the MX960 AC power supply, that is, the one on the
power supply and the one on the Power Distribution Module (PDU). Continue by
removing an adjacent existing power supply, and replacing it with a high-capacity
power supply.
The minimum number of power supplies must be present in the router at all times.
Table 1: Minimum Required Number of Power Supplies
Router Model
MX240
MX240
MX240
MX480
MX480
MX480
MX960

Upgrading the MX240 and MX480 AC Power Supplies

NOTE: Before upgrading, the MX Series router must be running JUNOS Release 10.0
R2 or later.
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
Configuration
AC high line
AC low line
DC
AC high line
AC low line
DC
AC
Upgrading the MX240 and MX480 AC Power Supplies
Upgrading the MX240 and MX480 AC Power Supplies
Minimum Required Number of Power
Supplies
1
2
1 (only 1 zone)
2
3
1 minimum per zone
1 minimum per zone
13