Depending on the distance the potential between two buildings is
something you want to avoid "tying" them together. Ethernet signals are
differential, so should be immune to the difference in ground potential.
So if you're using a shielded cable, ground at one end only (for noise
suppression).
Still, a fiber link would be preferable, or at least a VDSL link.
bp
<part15sbs{at}gmail{dot}com>
On 2/4/2017 12:39 PM, Colin Stanners wrote:
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]
<mailto:[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]
<mailto:[email protected]>>
To: "[email protected] <mailto:[email protected]>" <[email protected]
<mailto:[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]
<mailto:[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]
<mailto:[email protected]>] On Behalf Of Adam Moffett
Sent: Friday, February 3, 2017 11:47 AM
To: [email protected] <mailto:[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]
<mailto:[email protected]>>
To: [email protected] <mailto:[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.
