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RB2011 PoE
Posted: Sun Mar 05, 2017 4:39 am
by pready
How can I turn off the PoE on Eth1?
I am using Eht1 for WAN and when I plug into a switch that has PoE, the RB2011 goes down.
Workarounds I have thought of: 1. cut Ethernet centre wires (blue pair). 2. Reprogram RB2011 to use Eth2 for WAN
Re: RB2011 PoE
Posted: Sun Mar 05, 2017 12:37 pm
by expert
What does it mean has PoE ? Device 2011UIAs has:
a) PoE in on ether1
b) PoE out on ether10
What's wrong on having wan on e.g. eth7 ?
Re: RB2011 PoE
Posted: Sun Mar 05, 2017 1:32 pm
by pe1chl
It is unlikely that the RB2011 passive PoE would be affected by "a switch that has PoE" (normally 802.3AF/AT).
There is probably some other incompatability between your switch and the RB2011, e.g. something related to spanning tree.
Re: RB2011 PoE
Posted: Sun Mar 05, 2017 4:16 pm
by sup5
If you connect a RB2011 with eth1 to a PoE 802.3af/at enabled port, the RB2011 will go down. This is mostly because of overvoltage protection.
Tested on several Standard-PoE-Switches.
Re: RB2011 PoE
Posted: Sun Mar 05, 2017 7:33 pm
by pe1chl
That is strange, a 802.3AF/AT switch should not put 48v on a device that is not prepared to be powered using that standard.
But anyway, you can just turn off the PoE on the involved port and see if that fixes it.
Re: RB2011 PoE
Posted: Mon Mar 06, 2017 12:19 am
by sup5
There might be an alternative explanation:
Lots of switches apply negative power (eg. -48VDC)
This means the voltage applied to the RB2011 is reversed. Thus it switches off.