WS-12-250-AC Overvoltage - Killed all radios attached to it!

[twotincans]

At no point did I say I have Titanium Rocket so I'm not sure what your talking about.

I simply don't have time to test the switch as much as you would like. At this point, I have tossed it in the trash as I'm afraid that even if it was repaired that it could mess up again and fry the equipment attached. Even if that's only my sectors, that's still 6 sectors and around $1200 in damage, I can't take that risk again.

[sirhc]

At no point did I say I have Titanium Rocket so I'm not sure what your talking about.

I simply don't have time to test the switch as much as you would like. At this point, I have tossed it in the trash as I'm afraid that even if it was repaired that it could mess up again and fry the equipment attached. Even if that's only my sectors, that's still 6 sectors and around $1200 in damage, I can't take that risk again.

I did not say you had a Titanium I gave an example using a Titanium in a way that a 48V device "could" get damaged from a damaged switch MOSFET circuit on a port capable of 48VH.

"Your tower went down in a storm" and you are blaming the switch, the switch is the only possible cause of your grief?

But if you lost an AF I am telling you there is no way this switch can do that, you took a hit, possibly ESD?

As I said a switch can be damaged in a way as to apply 48V to a 24V port but that is from being damaged and is extremely rare.

So I can buy that a "damaged" switch "might" apply 48V to a 24V port which I told you how to test for that when you have time.

[twotincans]

I must be that "extremely rare" case as I've tested it with a test antenna and it did fry it. I'm not spending more time testing the switch in super detail or spend more time in this thread as I've already let you take up too much of my time.

Sorry to be rude but I'm done with this and I stand by my statement of:

I'm afraid that even if it was repaired that it could mess up again and fry the equipment attached. Even if that's only my sectors, that's still 6 sectors and around $1200 in damage, I can't take that risk again.

I will not be using Netonix switches again and I will share my experience with others.

[sirhc]

I am sorry you feel this way, just trying to help you out to figure out what happened, but I also stand by what I said.

Your tower went down in a STORM....enough said in my opinion.

Your a WISP, better get used to storm damage, weird things happen in storms.

I can agree that the switch "can" in a rare condition get damaged in such a way as to damage 24V devices "if" a port MOSFET circuit gets fried causing the switch to send 48V out to a 24V device. I told you how to test for that to see if that is the case but if the switch got damaged that hard there is a good chance the equipment on the tower was already fried from the surge/strike that already occurred.

It is impossible that the switch under any circumstances can do any damage to an AF radio as the AF radio is a 48V device that accepts power on all 4 pairs and there is no way the switch can deliver more voltage than 50V +/- as it has no way to STEP UP voltage beyond what the power supply provides the switch board and besides an AF can handle up to 60V before damage can occur.

After you explained the grounding which sounds good I am leaning more towards a ESD charge or possibly a direct strike.

You seem dead set on blaming the switch so not much I can do about that. However we are very familiar with the AF boards as we are soon going to be offering repair service on those units since UBNT will not.

If you want to investigate your AF then open it up and refer to the picture below.
If the board is damaged from ESD then you will most likely see damage in one or both of the Radio sections.
If you have damage to the Data/Main Ethernet Transformer and PHY then you are dealing with ground current.
Damage to the 48V power supply but no damage to the EThernet Transformer and PHY would indicate a SURGE of excessive voltage > 60V.
Damage to one of the other 2 power supplies "if an AF24HD or an AF24 with its Ground lug connected" but no damage to radios sections is most often ground current.

CLICK IMAGE BELOW TO VIEW FULL SIZE

[sirhc]

In the above picture you will notice the flux around the Transformer and PHY of the main Data Ethernet Port.

This was an AF24HD I lost a few weeks ago on a tower where we are still battling the grounding ever since Sprint left the water tower we co-located on and their crew stole the '" copper ground cables for salvage and cut all the Halo #2 TIN for salvage when they removed their equipment from the water tank over a year ago.

And most recently the township installed a backup generator on site and their electrician messed with the service grounds which we had to fix again after this damage occurred. SO far no more damage but time will tell.

The ground current took out the switch port Transformer and the Ethernet Transformer and PHY in the AF24HD.

This unit is now repaired and will be going back into service which will save me $3,000.00 since this damage was not warranty damage by UBNT.

Total cost of repair about $10 in parts and a couple hours labor so if we were doing this for someone else say $200.00+/- repair fee and they save a $3,000 radio.