Very interesting Sent from my Verizon Wireless 4G LTE Smartphone
----- Reply message ----- From: "Ken Hohhof via Af" <[email protected]> To: <[email protected]> Subject: [AFMUG] How common are crc errors on pmp100 Date: Mon, Nov 24, 2014 12:01 AM He's talking about swapping white/blue with white/brown. So instead of putting + on one pair and - on the other, you run +/- as twisted pairs just like the data pairs. So that when the sync pulse suddenly interrupts the current flow, there is less of an inductive kick and less coupling into the data pairs. Or so I assume. -----Original Message----- From: Jay Weekley via Af Sent: Sunday, November 23, 2014 11:18 PM To: [email protected] Subject: Re: [AFMUG] How common are crc errors on pmp100 How does swapping the blue and brown pairs fix the CRC issue? Mark Radabaugh via Af wrote: > Are you using Sync over Power on this AP? > > There is a known problem with the way that the sync over power works. It > > occurs when the cables to the AP are run parallel and tight to steel. If > > you tape the cables directly to the tower leg, you will almost always have > > a problem with CRC errors. > > The power supply wiring for the 430 product fixed the issue, but they went > > back to the original wiring in the 450. > > A couple of ways to fix the issue: > > a) Isolate the cables from the steel using standoffs. > b) Swap one wire each on the blue and brown pairs - Last Mile Gear had a > > note on the alternative wiring method at one time. I�m not crazy about > > it since it makes for a odd looking connector and the next guy who has to > > work on it is likely to cut it off and put it on �right�. The cable > > will also fail on any Ethernet tester, making it difficult to convince > > anyone that the cable is correct. > c) Turn off Sync over Power and use an alternative sync method - iGPS, > > Syncpipe Parasitic, etc. > > Mark > > > >> On Nov 20, 2014, at 1:24 PM, Bill Prince via Af <[email protected] >> >> <mailto:[email protected]>> wrote: >> >> We don't often see CRC errors on any of our APs, FSK, OFDM, or MIMO. >> >> If you're in lightning territory, check to see if these are coincident >> >> with lightning strikes. >> >> bp >> <part-15@SkylineBroadbandService> >> >> On 11/20/2014 9:24 AM, Craig Schmaderer via Af wrote: >>> This is a radio that has been up for 93 days, it is very heavy on >>> >>> traffic, would you say there is an issue with this radio? It is on a >>> >>> clean tower that only I am on. There are 4 other canopy radios on this >>> >>> tower receiving sync from a CTM1. All radios are just CAT5e cable non >>> >>> shielded, length is about 180� tops. Also there is a PTP800 with lmr >>> >>> 400 ran along with it, I never noticed this before, all other radios are >>> >>> showing about the same number of CRC errors, is this expectable? >>> Ethernet Link Detected : >>> >>> 1 >>> Ethernet Link Lost : >>> >>> 0 >>> Undersized Toss Count : >>> >>> 0 >>> inoctets Count : >>> >>> 4054728244 >>> inucastpkts Count : >>> >>> 1954469296 >>> Innucastpkts Count : >>> >>> 56834740 >>> indiscards Count : >>> >>> 0 >>> inerrors Count : >>> >>> 231695 >>> inunknownprotos Count : >>> >>> 0 >>> outoctets Count : >>> >>> 3150773755 >>> outucastpktsCount : >>> >>> 1289988260 >>> outnucastpkts Count : >>> >>> 1597027 >>> outdiscards Count : >>> >>> 0 >>> outerrors Count : >>> >>> 0 >>> RxBabErr : >>> >>> 0 >>> TxHbErr : >>> >>> 0 >>> EthBusErr : >>> >>> 0 >>> CRCError : >>> >>> 231601 >>> RcvFifoNoBuf : >>> >>> 94 >>> RxOverrun : >>> >>> 0 >>> LateCollision : >>> >>> 0 >>> RetransLimitExp : >>> >>> 0 >>> TxUnderrun : >>> >>> 0 >>> CarSenseLost : >>> >>> 0 >>> No Carrier : >>> >>> 0 >>> >>> /Craig R. Schmaderer/ >>> /CEO | Skywave Wireless, Inc./ >>> /Ph: 402-372-1975 | Fax: 402-372-1058/ >>> /Direct: 402-372-1052/ >> >> >
