On the EX4200 using DC power, if you run the command "show poe controller " you will see "DEVICE FAIL" in the status.  This is expected behavior since these platforms do not support PoE with DC power.

On the EX4200 using DC power, if you run the command "show poe controller", you will see "DEVICE FAIL" in the status. This is expected behavior since these platforms do not support PoE with DC power.

[master:1]
root> show poe controller 
Controller Maximum Power Guard Management Status
index power consumption band
0 0.00W 0.00W 0W DEVICE FAIL
1** 0.00W 0.00W 0W DEVICE FAIL
**New PoE software upgrade available.
Use 'request poe software upgrade'
Note: reboot of fpc is required after the software upgrade.

Log messages will show the following logs:

Nov 16 00:38:20 ljaco-core-01 /kernel: poe0: <POE> on i2c0
Nov 16 00:38:45 ljaco-core-01 chassism[986]: PoE: PoE module in error state

This is expected behavior where certain EX platforms do not support PoE with DC power. Please see Hardware Documentation Guide for each platform for confirmation.

The DC power supply in the switch does not support Power over Ethernet (PoE); you can use either an external power injector or an AC power supply to supply power to PoE devices that you connect to the switch.

This does not require an RMA and is expected.  For further questions please contact Juniper Technical Assistance Center (JTAC) for additional details. 

2020-08-25: Removed description of EOS platform EX3200. Added related links.