Thanks!!!!! This list is like graduate school Jaime Solorza On Mar 31, 2015 4:43 PM, "Forrest Christian (List Account)" < [email protected]> wrote:
> Ground bounce is where the ground potential moves. Usually it's a phrase > used in high speed circuit design where the switching currents cause enough > current to flow that the negative reference for a given part to be higher > or lower than the rest of the circuit. > > A fair number of people seem to use it in grounding where you see > intermittent non zero voltages at a specific point in the grounding bus. > Although now I think about it, this would normally make a surge suppressor > less likely to trip. > On Mar 31, 2015 11:26 AM, "Jaime Solorza" <[email protected]> > wrote: > >> Ok. I just asked my two automation engineers to explain ground bounce. >> They never the term. They assumed that voltage is getting injected or >> introduced into line somewhere. Recommended voltmeter and checking wires >> first >> >> Jaime Solorza >> On Mar 31, 2015 11:14 AM, "Forrest Christian (List Account)" < >> [email protected]> wrote: >> >>> Is this a higher RF site? >>> >>> I don't remember is the GIGE-APC high voltage? If this is a low >>> voltage unit, you may be seeing some sort of ground bounce and/or RF >>> triggering the surge supressor. >>> >>> On Tue, Mar 31, 2015 at 10:49 AM, Nate Burke <[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 >>>> >>>> >>> >>> >>> -- >>> *Forrest Christian* *CEO**, PacketFlux Technologies, Inc.* >>> Tel: 406-449-3345 | Address: 3577 Countryside Road, Helena, MT 59602 >>> [email protected] | http://www.packetflux.com >>> <http://www.linkedin.com/in/fwchristian> >>> <http://facebook.com/packetflux> <http://twitter.com/@packetflux> >>> >>>
