That would be my guess as well. I see sensitive surge suppressors cause
CRC errors all the time. Like the old 444SS's. Lightning strikes nearby
set them off and they react very fast, which is probably a good thing.
Sometimes it confuses the PHY and the link has to be bounced. I'd rather
have to do that than have a blown or degraded interface.
On 3/31/2015 4:33 PM, [email protected] wrote:
Seen this happen before. Has to be a potential between one of the
ethernet lines and ground. Sometimes it is because someone used a LV
version instead of a HV version.
*From:* Jaime Solorza <mailto:[email protected]>
*Sent:* Tuesday, March 31, 2015 11:13 AM
*To:* Animal Farm <mailto:[email protected]>
*Subject:* Re: [AFMUG] Ethernet Interference from Grounding using GIGE-APC
Bring out the Holy Hand ...oops bring out the voltmeter and see what
you get. Compare to non affected lines. Ground isolation is a
science all to itself
Jaime Solorza
On Mar 31, 2015 11:04 AM, "Sean Heskett" <[email protected]
<mailto:[email protected]>> wrote:
if there is voltage on the ground then yes it will cause ethernet
errors.
On Tue, Mar 31, 2015 at 10:49 AM, Nate Burke <[email protected]
<mailto:[email protected]>> wrote:
I just changed out an ATOM mikrotik to a CCR, and found that
it is Incrementing FCS Errors exactly every 30 seconds on the
Ethernet line from a Trango LYNX. The lynx is powered via DC,
so the Data line is clean of POE. I am using a GIGE-APC Unit
on the Ethernet line.
What I found through testing, was that the FCS Errors only
happened when the GIGE-APC was plugged into the chassis. They
happened at exact 30 second intervals. Because of this I'm
guessing that there is something introduced via the ground
that is causing them. If I pull the GIGE-APC out of the
Chassis, the errors stopped, if I plugged it back in, the
errors came back, at the exact same clock points (in my CCR
Log, always at 06 and 36 seconds regardless of the timing of
plugging/unplugging). I'm using the 1U APC chassis, and there
are other GIGE-APC, 444APC-HV, and GIGE-POE-APC units in it.
None of the other equipment is plugged into the CCR, so unsure
if it would increment FCS Errors on those. They are all
plugged into RB1100's, and have no errors logged in the mikrotik.
Any place to start troubleshooting something like this? Would
it make sense that something on the ground plane could cause
these Ethernet errors?
I believe that this is causing some very low level packetloss
through the link, about 1 packet every 5 minutes or so, I'm
guessing based on if the ping falls directly on the error frame.
Nate
