That’s a good point I had not considered. In addition to DC flux possibly saturating the core if the current doesn’t split equally, the wire inside those transformers is probably very small gauge, and if too small the transformer will heat up, possibly affecting Ethernet performance or even damaging the transformer.
From: Chuck McCown Sent: Friday, February 13, 2015 11:42 AM To: af@afmug.com Subject: Re: [AFMUG] Site Monitor Gigabit POE Injector Issue,related to AirFiber 24 http://www.wbmfg.com/products.cfm?PID=77 1.25 amps per pair or 5 amps for all 8 wires if all on the same polarity. It will do more but the transformer starts giving off some heat. I think it unsoldered itself at around 2 amps when I was designing it. From: TJ Trout Sent: Friday, February 13, 2015 10:34 AM To: af@afmug.com Subject: Re: [AFMUG] Site Monitor Gigabit POE Injector Issue, related to AirFiber 24 What's the rating chuck? On Feb 13, 2015 9:13 AM, "Chuck McCown" <ch...@wbmfg.com> wrote: I put in the highest current transformers I could find when I designed the GigE-APC-POE. From: Erich Kaiser Sent: Thursday, February 12, 2015 7:01 PM To: af@afmug.com Subject: Re: [AFMUG] Site Monitor Gigabit POE Injector Issue, related to AirFiber 24 I am going to try a tycon power DC POE tomorrow, see if that will work, just need to get it working at this point... Next step would be to run a new Cat5. Current Cat5 is Apex9. Erich Kaiser North Central Tower Consulting er...@northcentraltower.com Office: 630-621-4804 Cell: 630-777-9291 On Thu, Feb 12, 2015 at 7:19 PM, Ken Hohhof <af...@kwisp.com> wrote: Another (totally hypothetical) thought would be perhaps one of the pairs has a slight DC unbalance causing the DC current not to split equally, thus causing some DC flux in one of the transformers and degrading the pulse characteristics of the transformer. Which could happen if the UBNT injector has transformers with higher saturation specs than the Packetflux injector. From: George Skorup (Cyber Broadcasting) Sent: Thursday, February 12, 2015 7:09 PM To: af@afmug.com Subject: Re: [AFMUG] Site Monitor Gigabit POE Injector Issue, related to AirFiber 24 Is it an AF24 or 5? The 24 uses 50 watts. The power control relays on the regular and GigE injectors will only handle 1A @ 48VDC. If it's a 24, you're likely over that. The relay contacts are probably fused. The AF specific single-port injector uses a solid-state relay like a SyncInjector and can handle 2A, or more, I forget what Forrest said. That said, if the radio isn't getting enough power, it will be unpredictable. I have seen this happen. Sounds like you've tried the PacketFlux single AF injector and that does it too? Works fine with the UBNT brick? I have no idea. On 2/12/2015 6:52 PM, Erich Kaiser wrote: Guys this is not my first rodeo, This is the new Gigabit 8 Port Injector and I have also tried the Packetflux Airfiber Injector, same issue, switch to stock UBNT POE and it works fine. This is an all DC site, with separate DC to DC converters and everything is fused..... See POE directions direct from Packetflux Erich Kaiser North Central Tower Consulting er...@northcentraltower.com Office: 630-621-4804 Cell: 630-777-9291 On Thu, Feb 12, 2015 at 6:45 PM, Bill Prince <part15...@gmail.com> wrote: It should not work with a regular POE injector. 50 watts is too much current for 4 pins; you need to supply power on all 8 pins. And that, in turn, requires transformers to isolate the data lines. So I would not expect it to work at all with a vanilla POE. Well, maybe it might work for a little while, and it would probably only do 100baseT. Then the 4/5 & 7/8 pins will fry. bp <part15sbs{at}gmail{dot}com> On 2/12/2015 4:20 PM, Erich Kaiser wrote: Anyone else seen any issues with the Airfiber Module or running the Airfiber through the Gigabit POE Injector. I am seeing an issue with TX data, RX works fine, getting full bandwidth. TX I get about 2Mbps. Hooked up to Regular POE and everything is fine, any ideas? Erich Kaiser North Central Tower Consulting er...@northcentraltower.com Office: 630-621-4804 Cell: 630-777-9291
