There is a timing consideration if running half duplex, the guard interval will not be sufficient if the cable distance is > 100 meters.
You may be able to go a little farther than 100 meters on cable with excellent attenuation and crosstalk characteristics (e.g. Cat6) if using full duplex. From: AF <af-boun...@af.afmug.com> On Behalf Of Jesse DuPont Sent: Monday, January 14, 2019 5:12 PM To: AnimalFarm Microwave Users Group <af@af.afmug.com>; ch...@wbmfg.com Subject: Re: [AFMUG] Ethernet 100M Copper Limit Well, I meant Ethernet generically. Regardless of 4-wire vs 8-wire, in general, the purported safe distance for an Ethernet over copper (as opposed to fiber) connection is 100 meters. What drives this safe distance limitation spec? Jesse DuPont Network Architect email: jesse.dup...@celeritycorp.net <mailto:jesse.dup...@celeritycorp.net> Celerity Networks LLC Celerity Broadband LLC Like us! facebook.com/celeritynetworksllc Like us! facebook.com/celeritybroadband On 1/14/19 4:03 PM, ch...@wbmfg.com <mailto:ch...@wbmfg.com> wrote: I presume you are talking about 4 wire Ethernet because we do GigE all the time on copper. GigE uses all 8 wires and has data flowing both directions. 100 Mbps E uses 4 wires (2 pair) with TX on one pair and RX on the other pair. GigE uses advanced modulation methods as well. Does that help? From: Jesse DuPont Sent: Monday, January 14, 2019 3:58 PM To: AnimalFarm Microwave Users Group Subject: [AFMUG] Ethernet 100M Copper Limit I figured this was the best place to ask this question: What is the primary reason for the 100M limit on copper Ethernet links? Is it related to bit errors/SNR or is there a timing element involved? Something else? Thanks! -- Jesse DuPont Network Architect email: jesse.dup...@celeritycorp.net <mailto:jesse.dup...@celeritycorp.net> Celerity Networks LLC Celerity Broadband LLC Like us! facebook.com/celeritynetworksllc Like us! facebook.com/celeritybroadband _____ -- AF mailing list AF@af.afmug.com <mailto:AF@af.afmug.com> http://af.afmug.com/mailman/listinfo/af_af.afmug.com
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