Finally got one of the new Cambium units in for testing. It is similar to my GigE-SS and CAT6-SS in most parameters. Insertion Loss, NEXT etc. But there is a major difference in Return Loss. Return Loss measures how much signal bounces back from the far end. On 100 Mbps Ethernet circuits it doesn’t matter because each pair is simplex. But with GigE circuits each pair is duplex and any reflected energy can combine with the desired signal coming from the far end and cause errors.
Pairs Cambium MTC 1/2 10.3(db) 30.2 3/6 11.6 28.9 4/5 10.5 26.3 7/8 10.0 25.9 From: Jaime Fink Sent: Friday, September 21, 2018 11:57 AM To: AnimalFarm Microwave Users Group Subject: Re: [AFMUG] Mimosas surge doesn't help 450 Can only guess at the motivations, but this is only a test they did in their controlled lab, we haven’t seen this as a problem with that ISP in the lightning season in the field reported to us, and we of course lab test at much higher kV levels than the ones they claim generally, the ISP did their own testing as well with specific radios. So as Chuck said, I’d consider the source. Jaime Fink • Mimosa • CTO & Co-Founder From: AF <[email protected]> on behalf of Josh Luthman <[email protected]> Reply-To: AnimalFarm Microwave Users Group <[email protected]> Date: Friday, September 21, 2018 at 10:49 AM To: AnimalFarm Microwave Users Group <[email protected]> Subject: Re: [AFMUG] Mimosas surge doesn't help 450 But why go out of the way to do all this work if it doesn't cause problems? They're not making enough sales on their own surge suppressor, which I didn't even know exists... Josh Luthman Office: 937-552-2340 Direct: 937-552-2343 1100 Wayne St Suite 1337 Troy, OH 45373 On Fri, Sep 21, 2018 at 1:37 PM, Jaime Fink <[email protected]> wrote: Agree Chuck, and similar anonymous 3rd parties also confirm their largest customer switched suppliers after extensive testing, and suddenly the replacement GDT version is ”not recommended” from the Grassy Knoll. Interesting why nothing was said by the “3rd party” about interoperability with other radios as it seems rather isolated to a few radio models that customer happily uses it with… Jaime Fink • Mimosa • CTO & Co-Founder From: AF <[email protected]> on behalf of "[email protected]" <[email protected]> Reply-To: AnimalFarm Microwave Users Group <[email protected]> Date: Friday, September 21, 2018 at 9:03 AM To: AFMUG <[email protected]> Subject: Re: [AFMUG] Mimosas surge doesn't help 450 Well... Consider the source. They have an ethernet problem. Even with no surge suppressor they have frame check and CRC errors. Most semiconductor based surge suppressors aggrivate that problem. Gas discharge tube products don’t. While I will agree that they are a bit slower, to say they do not protect the product is disingenuous at best and totally false at worst. But the users will be the true test. From: Josh Luthman Sent: Friday, September 21, 2018 8:23 AM To: AFMUG Subject: [AFMUG] Mimosas surge doesn't help 450 https://www.cambiumnetworks.com/resource/applications-alert-surge-suppressors/ How does this apply to yours Chuck? Josh Luthman Office: 937-552-2340 Direct: 937-552-2343 1100 Wayne St Suite 1337 Troy, OH 45373 ------------------------------------------------------------------------------ -- 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 -------------------------------------------------------------------------------- -- AF mailing list [email protected] http://af.afmug.com/mailman/listinfo/af_af.afmug.com
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