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I've wanting to bump power from 24V up to 48V for an AF5X (date code says ok for 48V) but the PoE option in the WS-12-250A is greyed out...



A number of other ports also have all entries greyed out



Ideas?

Well first I moved your post from the Pictures section to the Hardware and Software problems section.

If a port already has an Ethernet link it will not allow you to turn POE on for that port or change the existing POE option.

I can not see your full screen so I am guessing there is already a link on the port you're trying to turn POE ON such as a link to a laptop.

The logic here is a safety sanity check in that if a port already has an Ethernet link without POE applied or an existing POE option why would you want to turn POE on or change the POE option and possibly damage the device and or the switch?

You will have to turn POE OFF then select the other POE option.

understood. I'll power the ports off before bringing them up at 48V. and yes, all those ports are active.


we are having an AF5X drop to 100Mbps a lot. Seems like a common fix is to bump compatible units to 48V... 25m runs from netonix to AF5X.

rebelwireless wrote:understood. I'll power the ports off before bringing them up at 48V. and yes, all those ports are active.

we are having an AF5X drop to 100Mbps a lot. Seems like a common fix is to bump compatible units to 48V... 25m runs from netonix to AF5X.

Well the AFX radios support 48VH as well if that is available on that port?

But I had several AF5X radios constantly drop to 100M and in fact I still have 2 units doing this and each time it has taken a NEW cable run to resolve the issue.

All AFX radios now support 24V, 24VH, 48V, and 48VH

The only AFX radios that do not support all flavors of POE are the first batch of AF5X radios.

A lot of thing contribute to an Ethernet link speed stability and CRC errors:

The quality of the following:
Ethernet PHYs
Ethernet Transformers
ESD protection Diodes
How well the traces were laid out on the PCB to maintain the proper impedance and the quality of the PCB.
Software

How often does 48v resolve the 100Mb issue, if ever?

rebelwireless wrote:How often does 48v resolve the 100Mb issue, if ever?

I am not sure if it did for us but it can not hurt to try so long as your sure your radio supports 48V.

Read Post #1 to be sure:
viewtopic.php?f=6&t=1215#p9040

A lot of people are complaining about AFX radios with link speeds and CRCs (and not with just our switches).

However after we replaced the cables on ours we achieve a solid 1G....the CRCs are much less but still present.

I have made posts about this on our forums and on UBNT forums, there is a long thread or 2 over there about the issue.

And of course the dreaded Pause Frame Storms as described on both forums. - If you have not read these threads you should.

Here:
viewtopic.php?f=17&t=1654

There:
http://community.ubnt.com/t5/airFiber/P ... rue#M28857