79/7841 and moving between brick and PoE power

[BEN ROBINSON]

Hi!

Has anyone had an issue in at least the 79/7841 phones where they are connected to PoE power, and you go to move them to another PoE port and will not power on, but if you connect them to a power brick they will power on; then if you move them back to a PoE port they will power on? Thanks!

[Wilson Samuel]

Hi,

It could be because of the power configuration on the switch.

The 7941 is a Class 2 PoE device and also supports the  Cisco Pre Standard  PoE and the 7841 is a Class 1 PoE (IEEE 802.3 af) and consumes lesser energy to the predecessor

What switches you are connecting them to and does the switch itself has enough power to power all PoE devices connected to the ports?

HTH

[BEN ROBINSON]

Hi!

2960S and 2960X switches - within the PoE budget

[Leo Laohoo]

I've seen this happening on 3850 switches and involving 7800 phones.  What IOS are the 2960S/X running on?

[BEN ROBINSON]

v15.0(1)SE3... Do you notice it on certain IOS versions?

[Leo Laohoo]

v15.0(1)SE3

Huh?  I know for a fact there is no "15.0(1)SE3" that will run on a 2960X.

[BEN ROBINSON]

Oops that was our 2960S, the 2960X is 15.0(2)EX5.

[Leo Laohoo]

Downgrade to EX3 and see if you find some improvements.

[BEN ROBINSON]

Thanks - will do!