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T4000 Power Management (Three 80-A Cables on a Six-Input DC Power Supply)


For Junos OS Release 12.3 and later, the power management feature ensures that the router has enough power to support an FPC before the FPC is brought online. To configure the power management feature, see Configuring DC Power on a T4000 Router. Depending on the type of FPCs installed, the router might not support a fully loaded chassis when you connect three 80-A DC power cables to a six 60-A input power supply using terminal jumpers.

If the power is underprovisioned for your hardware configuration, power management limits the number of FPCs brought online based on the following rules:

  • A maximum of six T1600 Enhanced Scaling FPC4 (Model: T1600-FPC4-ES) can be online.

  • When one T1600-FPC4-ES is installed, a maximum of seven FPCs can be online.

  • When there are no T1600-FPC4-ES installed, a maximum of eight FPCs (a fully loaded chassis) can be online.

For example, if there are seven online FPCs and you insert an T1600-FPC4-ES, the power management feature will not power on the FPC.


In the event of a chassis restart, master switchover, or router reboot, the power management feature powers on the FPCs based on the setting of the set chassis fru-poweron-sequence command.


If you do not configure the power management feature and you are connecting three 80-A DC power cables to the six-input power supply and the maximum power draw is exceeded, FRU states might change from Online to Offline or Present, or the interfaces might flap, or some traffic might drop.