If we can feed you any data to help troubleshoot, please let me know what that would be. in several places we've had to remove the modules. It only seems like it's airfiber 24's and 5x's we ever have problems with. I mostly chock it up them and possibly crummy ethernet ports. When we have trouble it doesn't seem to matter what cable we use or how long the run is it. We have lots on UBNT Carrier cable and recently many on Primus CAT6, doesn't seem to make a lot of difference. Removing the modules always fixes the CRC errors though.
On Sat, Jul 29, 2017 at 9:10 PM, <ch...@wbmfg.com> wrote: > It tests perfect on the lab.... but as we all know.... > > Full speed, no CRC or any other type of errors. Long cables, short cables > etc etc. > > I generally only hear from cambium users. And not that much, so it is not > happening on all of them, but some. > > I do have 3 components coming that have better specs that I am switching > to. > It will improve NEXT and return loss. > If that is the cause then that will be the fix. > > There is also a thing in the POE inserters called the "Bob Smith" or BS > termination. > There really was a guy named Bob Smith that did the original calculation. > > There is another guy that has more recently published a different > mathematical treatment of the BS termination that uses a different > impedance. I am going to try this and see if it improves things as well. > > -----Original Message----- From: George Skorup > Sent: Saturday, July 29, 2017 4:10 PM > To: af@afmug.com > Subject: Re: [AFMUG] new GigE-APC issues > > I had very few issues with the previous ones. The RJ45 tab facing at the > PCB was a minor inconvenience. Sync over power + gigabit didn't play > nice with those, but GigE otherwise worked fine. > > I tested a couple prototypes of the new revision for Chuck. Sync over > power + gigabit with a PowerInjector+Sync and a 450 AP worked fine. Then > we replaced that AP with a 450i because of the 450's PPS limit. I didn't > notice it at the time, but the 450i never came up at gigabit. We didn't > really need >80Mbps downlink anyway. It would usually run about 55-60 at > night which was where the 450 was crapping out. Well, more like 50 and > 9-10k PPS. > > Now I've got some ePMP GPS radios for PTP (not for sync, just the GigE > interface). Same symptoms as the UBNT prism thingamajig. The link comes > up at gig, but flaps and constant FCS errors. The 450i just goes, gig, > gig, gig, nope.. 100mbps at bootup. > > Pulling the SS out makes it work, but I can't do that. We lost that 450i > AP because someone went and bypassed the SS because they were apparently > concerned about the CRC errors and didn't f'ing tell me about it, even > after I said I'd debug it on Monday. Welp, a storm rolled in the Friday > before and.. there went the AP. Good job! In Steve Jones' words, I have > only one comment: fuckwits. > > I'd say just stay tuned. Chuck is working on it. As he put it, GigE is a > different animal. NEXT, FEXT and all that fun stuff. > > On 7/29/2017 4:20 PM, Matt wrote: > >> Seeing same issues on Gigabit ethernet ports with Cambium PxP450i and >> also SAF licensed gear. Shorter cable runs help but just not possible >> on some towers. Bypassing the GigE-APC always fixes it. >> >> >> On Sat, Jul 29, 2017 at 12:40 PM, George Skorup >> <george.sko...@cbcast.com> wrote: >> >>> I think I've seen this mentioned a few times now. Maybe Steve and a >>> couple >>> others? >>> >>> The latest revision (D?) is causing CRC/FCS errors and random link drops. >>> Taking the SS out makes all problems go away. >>> >>> Definitely more issues at gigabit. I have multiple sites with some UBNT >>> and >>> ePMP stuff (no sync over power). Some I've turned off gigabit negotiation >>> and get only a few FCS errors here and there. Running gigabit sees lots >>> more >>> errors and adds a 2-3 second link loss randomly which is a big issue on a >>> PTP link. >>> >>> Got a couple sites with 450i APs. One that I was working with the other >>> day >>> is a new radio (because the old one blew up). New cable, new GigE-APC, >>> new >>> PacketFlux PowerInjector. The link tries to negotiate gigabit, but falls >>> back to 100 after a few tries. Turned off sync over power just to see and >>> still no gigabit. Remove the SS and it works fine. >>> >>> Floating the shield makes no difference. Running the site on battery also >>> makes no difference. Some FM sites, some water towers, some elevators, >>> some >>> regular towers with only our stuff on it. >>> >>> The stuff I was working with yesterday is a new UBNT Prism PTP radio, new >>> GigE-APC, new CCR1009. This site also has an Exalt G2-11 fed by an older >>> GigE-POE-APC and I get no errors on that. It used to be plugged into a >>> MikroTik CRS210 and I didn't see any errors on that either. >>> >>> I had far fewer issues with the older cards. Unfortunately I don't think >>> I >>> have any good ones left to do a comparison. I do have a couple that got >>> some >>> water in the jack, maybe I can clean those up for testing. I've used >>> maybe >>> 10 of the new ones now and they all seem to be causing issues. And before >>> you ask, yes, I've tried dumb gigabit switches at a few sites temporarily >>> and still see the random link loss with the SS in line. >>> >>> >>> > -- Adair Winter VP, Network Operations / Co-Owner Amarillo Wireless | 806.316.5071 C: 806.231.7180 http://www.amarillowireless.net <http://www.amarillowireless.net>
