PTC fuses are not fast enough to protect Netonix. It actually has them inside. That is why I build the POE fuse product. It does blow fast enough to protect the switch.
From: Mark Radabaugh Sent: Monday, September 17, 2018 1:12 PM To: AnimalFarm Microwave Users Group Subject: Re: [AFMUG] Surge suppression failure gigE APC HV Chuck, We have had really good luck with putting PTC fuses in front of the POE power on the Mimosa radios in order to avoid blowing the fuses in the rectifier shelf when the gas tubes in the Mimosa short the POE. I’m thinking maybe you want to look at putting some of those on the SS for the power coming from the Netonix? Let the gas tubes (or whatever surge suppressor you are using) short all the lines together and let the PTC fuse cut the power briefly? Might be a little tricky to get the values right but might be able to save the POE from blowing. Or talk Netonix into including them internally so that they survive a POE short circuit. For those of you scratching your head… we routinely power Mimosa B5’s using Packetflux DC injectors from the -48V rectifier. The surge suppression in the B5’s will short the power supply during a surge event long enough to blow the 2 or 5A telecom fuse. All the equipment lives but we have to go replace the fuse - which we don’t want to do since it causes an outage until we get there. The PTC fuse inline avoids the fuse blowing. Mark On Sep 17, 2018, at 10:33 AM, [email protected] wrote: Surges cause the surge components to do their job, which is to short everything to ground. Netonix ports will blow if they are shorted. From: Josh Luthman Sent: Monday, September 17, 2018 6:58 AM To: AFMUG Subject: Re: [AFMUG] Surge suppression failure gigE APC HV Should only be 24v. Even if it doubled, should be OK on the radio and surge card. What's the Netonix problem? Josh Luthman Office: 937-552-2340 Direct: 937-552-2343 1100 Wayne St Suite 1337 Troy, OH 45373 On Fri, Sep 14, 2018, 12:44 PM <[email protected]> wrote: If the voltage was too high or had spikes it could certainly have done that. Kinda the reverse of the Netonix problem. From: Josh Luthman Sent: Friday, September 14, 2018 10:37 AM To: AnimalFarm Microwave Users Group Subject: Re: [AFMUG] Surge suppression failure gigE APC HV I replaced the POE, AP, and surge card on Tuesday. That's what fixed it for sure. The AP is sitting here in the lab and doing gigabit for 3 days now, happily. The POE and surge card are in the trash. I'm wondering if it's possible the POE fried all of those surge cards on Saturday/Sunday/Monday/Tuesday. If that's possible? Josh Luthman Office: 937-552-2340 Direct: 937-552-2343 1100 Wayne St Suite 1337 Troy, OH 45373 On Thu, Sep 13, 2018 at 2:21 PM, <[email protected]> wrote: You say you are inclined to think it is the POE. I presume that means the POE power supply. So try a new one. I am probably not understanding the situation. From: Josh Luthman Sent: Thursday, September 13, 2018 11:39 AM To: AnimalFarm Microwave Users Group Subject: Re: [AFMUG] Surge suppression failure gigE APC HV I have a thousand new POEs. What do you want me to try? Josh Luthman Office: 937-552-2340 Direct: 937-552-2343 1100 Wayne St Suite 1337 Troy, OH 45373 On Thu, Sep 13, 2018 at 11:07 AM, <[email protected]> wrote: Do you have a spare POE to try ? From: Josh Luthman Sent: Thursday, September 13, 2018 6:10 AM To: AnimalFarm Microwave Users Group Subject: Re: [AFMUG] Surge suppression failure gigE APC HV Well there was no lightning or anything, beautiful weather. After several cards I have to imagine it's the POE or the AP. We replaced those two at the same time. Does it make sense the POE was doing something weird to fry them or more sense the AP was pulling too many amps? AP seems perfectly fine in the office for 36 hours, so I'm inclined to believe it's the POE. Josh Luthman Office: 937-552-2340 Direct: 937-552-2343 1100 Wayne St Suite 1337 Troy, OH 45373 On Tue, Sep 11, 2018 at 2:51 PM, Chuck McCown <[email protected]> wrote: It resets immediately if it is going to reset. Sounds like it took a hit. From: Josh Luthman Sent: Tuesday, September 11, 2018 12:45 PM To: AnimalFarm Microwave Users Group Subject: Re: [AFMUG] Surge suppression failure gigE APC HV How long does it need to be cold for it to be self reset? The one I took down this morning looks perfectly clean and I can't get pins 7/8 through it. At this point I'm thinking the (AC) POE is the cause of all our issues (Cambium, so that pair is positive 24v and data). Josh Luthman Office: 937-552-2340 Direct: 937-552-2343 1100 Wayne St Suite 1337 Troy, OH 45373 On Tue, Sep 11, 2018 at 10:47 AM, Chuck McCown <[email protected]> wrote: Sure, you can also wash them with 90% isopropyl alcohol. That will remove any water. Need to make sure there is no corrosion. Wash out the jacks extra good too. If they have not had too large of a surge, they are totally self resetting. From: Josh Luthman Sent: Tuesday, September 11, 2018 7:25 AM To: AFMUG Subject: [AFMUG] Surge suppression failure gigE APC HV There's a cause and I'm pretty confident it's not the cards themselves. This weekend an AP started having eth link issues. Look at it and the card/rj45 is full of water. Replaced the line. Problem returns about 12 hours later. I plug in my continuity tester and pin 7 blinks quickly and fades away. Headed up the tower now for a new AP and already did a new Poe (no power until AP replaced). Is it possible the Poe/AP are damaging the surge card? We've gone through 5-6 cards since Saturday, and I thought it was all water related. It stopped raining on Sunday after card 3 + new line. Any other ideas? Can I wait a minute and reuse the dry cards, are they self resetting (I tried power cycling the POE for 5 seconds with no change) after a length of time? Josh Luthman Office: 937-552-2340 Direct: 937-552-2343 1100 Wayne St Suite 1337 Troy, OH 45373 -------------------------------------------------------------------- -- AF mailing list [email protected] http://af.afmug.com/mailman/listinfo/af_af.afmug.com -- AF mailing list [email protected] http://af.afmug.com/mailman/listinfo/af_af.afmug.com ---------------------------------------------------------------------- -- AF mailing list [email protected] http://af.afmug.com/mailman/listinfo/af_af.afmug.com -- AF mailing list [email protected] http://af.afmug.com/mailman/listinfo/af_af.afmug.com ------------------------------------------------------------------------ -- AF mailing list [email protected] http://af.afmug.com/mailman/listinfo/af_af.afmug.com -- AF mailing list [email protected] http://af.afmug.com/mailman/listinfo/af_af.afmug.com -------------------------------------------------------------------------- -- AF mailing list [email protected] http://af.afmug.com/mailman/listinfo/af_af.afmug.com -- AF mailing list [email protected] http://af.afmug.com/mailman/listinfo/af_af.afmug.com ---------------------------------------------------------------------------- -- AF mailing list [email protected] http://af.afmug.com/mailman/listinfo/af_af.afmug.com -- AF mailing list [email protected] http://af.afmug.com/mailman/listinfo/af_af.afmug.com ------------------------------------------------------------------------------ -- AF mailing list [email protected] http://af.afmug.com/mailman/listinfo/af_af.afmug.com -- AF mailing list [email protected] http://af.afmug.com/mailman/listinfo/af_af.afmug.com -------------------------------------------------------------------------------- -- AF mailing list [email protected] http://af.afmug.com/mailman/listinfo/af_af.afmug.com
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