The magnetic isolation (from the built-in ethernet transformer) would probably help, I should've thought of those models. But the surge clamping voltage of 69 volts would be unlikely to be triggered by most building voltage differential I believe?
On Sat, Feb 4, 2017 at 8:06 PM, Chuck McCown <[email protected]> wrote: > My POE inserters are also surge suppressors as well as magnetic > isolation. > Might help. > > *From:* Colin Stanners > *Sent:* Saturday, February 04, 2017 1:39 PM > *To:* [email protected] > *Subject:* Re: [AFMUG] PoE Cat5/6 cable distances > > I'm also looking at this type of problem for a customer, a few buildings > far apart with long ethernet runs between them, on that network ports and > devices sometimes die, I believe due to the varying voltage potential > difference between the buildings. There are some grounded surge supressors > there that may be helping - but not much. Most SSes only trigger at higher, > lightning-level voltages. > > Having the long ethernet cable between buildings be shielded (and > correctly grounded at both ends) can help too, but if it ends up equalizing > the potential between both buildings, you could have a few amps flowing > between the buildings over that shield, which would be very bad indeed. A > heavy-gauge ground cable between the buildings may be the best option but > would be expensive. > > Another option is creating an optoisolator at one end with two > back-to-back fiber-optical converters. As long as the one wired to the > further building doesn't couple Ethernet "ground" to power ground inside > itself. > > > On Fri, Feb 3, 2017 at 12:33 PM, Adam Moffett <[email protected]> wrote: > >> A grounded surge suppressor on each end will help with that. >> The ground can have a different electrical potential at two points that >> far apart. Then you get a current through your devices trying to equalize >> it. >> >> >> ------ Original Message ------ >> From: "That One Guy /sarcasm" <[email protected]> >> To: "[email protected]" <[email protected]> >> Sent: 2/3/2017 1:14:02 PM >> Subject: Re: [AFMUG] PoE Cat5/6 cable distances >> >> >> We have a customer who trenched 500 foot of cat5 to an outbuilding, >> routers pop for "some reason" >> I wonder if an extender would help with that >> >> On Fri, Feb 3, 2017 at 11:48 AM, Ken Hohhof <[email protected]> wrote: >> >>> Are you trying to exceed 100 meters? Is there a good reason not to use >>> fiber + DC power? >>> >>> -----Original Message----- >>> From: Af [mailto:[email protected]] On Behalf Of Adam Moffett >>> Sent: Friday, February 3, 2017 11:47 AM >>> To: [email protected] >>> Subject: Re: [AFMUG] PoE Cat5/6 cable distances >>> >>> Google for ethernet extenders with PoE. >>> They exist. Never used one. I think up to 1000' >>> >>> >>> ------ Original Message ------ >>> From: "Dev" <[email protected]> >>> To: [email protected] >>> Sent: 2/3/2017 12:45:40 PM >>> Subject: [AFMUG] PoE Cat5/6 cable distances >>> >>> >Is there any way to extend the cable length over a few hundred feet and >>> >still get reliable power/data? >>> >>> >>> >>> >> >> >> -- >> If you only see yourself as part of the team but you don't see your team >> as part of yourself you have already failed as part of the team. >> >> >
