A flat tire... with duct tape over the puncture.
----- Mike Hammett Intelligent Computing Solutions Midwest Internet Exchange The Brothers WISP ----- Original Message ----- From: "Ken Hohhof" <[email protected]> To: "AnimalFarm Microwave Users Group" <[email protected]> Sent: Friday, April 12, 2019 11:56:02 AM Subject: Re: [AFMUG] Voltage Drop on Surges At customer installations, every year we have a few where the Ethernet surge protector (not Chuck’s) takes a hit that degrades some of the diodes but doesn’t blow them totally shorted or open, resulting in Ethernet errors. Usually we force 10BaseT as a workaround and ship the customer a replacement POE. We used to see this on the 300SS/600SS although we stopped using them quite a few years ago. I’m not sure we’ve seen this on APs or backhauls, I guess surges at towers tend to be more all-or-nothing in terms of destruction. Also I never reuse surge protectors from towers, I’d rather throw them away and pay for a new one than have anything questionable on important network infrastructure, especially if a climb is involved, and especially since we don’t really have a way to test surge protectors to see if they are at 100% of specs. So if those Mimosa installs worked initially but then started having Ethernet negotiation, flapping or CRC problems, it could be a surge protector that took one for the team but wasn’t quite the same afterward. Still doesn’t explain why Mimosa should have more problems than any other radios. It also seems that every RJ45 connector, even without any electronics, has to add some impairments and a point of failure to the path. Including return loss mismatch and crosstalk. And over time you get water, dust, spiders, corrosion. We do put a dab of DC4 silicone grease in every RJ45 at a tower, so far we haven’t gone to doing that at customer installs. At that end we have more issues with dogs, critters, hedge trimmers, roofers, satellite TV guys, etc. And then customers who repair the cable with wire nuts and electrical tape. And then complain because “my Internet is slow”. OK, in the sense that 50% packet loss or outright link drops can be described as “slow”. If cars were like the Internet, a flat tire would be described as “my car is slow”. From: AF <[email protected]> On Behalf Of Mike Hammett Sent: Friday, April 12, 2019 11:29 AM To: AnimalFarm Microwave Users Group <[email protected]> Cc: Keefe John <[email protected]> Subject: Re: [AFMUG] Voltage Drop on Surges Yet I will say that the only Mimosa Ethernet problems I've had were on runs over 100m. *shrugs* ----- Mike Hammett Intelligent Computing Solutions Image removed by sender.Image removed by sender.Image removed by sender.Image removed by sender. Midwest Internet Exchange Image removed by sender.Image removed by sender.Image removed by sender. The Brothers WISP Image removed by sender.Image removed by sender. ----- Original Message ----- From: "Josh Luthman" <[email protected]> To: "AnimalFarm Microwave Users Group" <[email protected]> Cc: "Keefe John" <[email protected]> Sent: Friday, April 12, 2019 10:56:21 AM Subject: Re: [AFMUG] Voltage Drop on Surges We should create a Bingo board where Mimosa says ethernet problems are caused by _______. I've never bought a Mimosa radio and I've heard more ethernet problems with that brand more than anything else combined it feels like. Josh Luthman Office: 937-552-2340 Direct: 937-552-2343 1100 Wayne St Suite 1337 Troy, OH 45373 On Fri, Apr 12, 2019 at 11:15 AM < [email protected] > wrote: I would argue that our CAT6 gas tube versions add about the equivalent of a foot of CAT5 capacitance. There is no argument that in some cases it causes problems. But we sell tens of thousands of these things each year and we hear of one or two instances like this each year. In my opinion there must be other contributing factors. But lets see what the list thinks. From: Keefe John Sent: Friday, April 12, 2019 8:37 AM To: Chuck McCown Subject: Re: Voltage Drop on Surges mimosa says You can use it for our radios to get protection on them but sometimes it can cause Port Flapping between 1000baseT and 100BaseT because of the additional capacitance it adds on the line between PoE and radio Keefe John CEO Ethoplex Direct: 262.345.5200 -------------------- Ethoplex Business Internet http://www.ethoplex.com/ Signal Residential Internet http://www.signalisp.com/ https://www.linkedin.com/in/keefejohn/ On Fri, Apr 12, 2019 at 9:15 AM Keefe John <[email protected]> wrote: <blockquote> Why do people keep saying using surges on the top and bottom of a tower causes connectivity issues? Like dropping from 1gbps to 100 mbps? How does your stuff work with Mimosa? Keefe John CEO Ethoplex Direct: 262.345.5200 -------------------- Ethoplex Business Internet http://www.ethoplex.com/ Signal Residential Internet http://www.signalisp.com/ https://www.linkedin.com/in/keefejohn/ On Fri, Apr 12, 2019 at 9:09 AM Chuck McCown <[email protected]> wrote: <blockquote> Zero on surge suppressors. Fused have a very low resistance, I would have to look it up, but the voltage drop would depend on current. Sent from my iPhone On Apr 12, 2019, at 8:06 AM, Keefe John <[email protected]> wrote: <blockquote> What's your insertion voltage loss on your POE fuses and surge supressors? Keefe John CEO Ethoplex Direct: 262.345.5200 -------------------- Ethoplex Business Internet http://www.ethoplex.com/ Signal Residential Internet http://www.signalisp.com/ https://www.linkedin.com/in/keefejohn/ </blockquote> </blockquote> -- AF mailing list [email protected] http://af.afmug.com/mailman/listinfo/af_af.afmug.com </blockquote> -- AF mailing list [email protected] http://af.afmug.com/mailman/listinfo/af_af.afmug.com -- AF mailing list [email protected] http://af.afmug.com/mailman/listinfo/af_af.afmug.com
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