Date: Thu, 16 Jul 2009 16:22:46 -0500 From: David Kelly <dkelly@hiwaay.net> To: Michael Powell <nightrecon@verizon.net> Cc: freebsd-questions@freebsd.org Subject: Re: 5000' ethernet? Message-ID: <20090716212246.GA43131@Grumpy.DynDNS.org> In-Reply-To: <h3o2n1$edd$1@ger.gmane.org> References: <20090715194718.GA16401@Grumpy.DynDNS.org> <h3llqc$rl9$1@ger.gmane.org> <41F6B586-E6A8-4FF8-95EB-E8A6C8E1F020@hiwaay.net> <h3midk$ju2$1@ger.gmane.org> <20090716133800.GA20121@Grumpy.DynDNS.org> <h3o2n1$edd$1@ger.gmane.org>
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On Thu, Jul 16, 2009 at 04:33:24PM -0400, Michael Powell wrote: > David Kelly wrote: > > > > Last sentences in last paragraph before See Also at > > > http://en.wikipedia.org/wiki/Carrier_sense_multiple_access_with_collision_detection: > > > > "Also, in Full Duplex Ethernet, collisions are impossible since data > > is transmitted and received on different wires, and each segment is > > connected directly to a switch. Therefore, CSMA/CD is not used on > > Full Duplex Ethernet networks." > > Aha! I did not know this (obviously). Learn something new every day... > Maybe I'm getting too old for this line of work. The brain just isn't > working the way it once did. I'm a big proponent of RTFM, but usually > am looking at new material instead of forgetting stuff I read +20yrs > ago. Thanks for setting me straight guys, it's better to be "in the > know" than the other way around. Maybe time to retire. I like my job but can think of a lot of other funner things to be doing. There are a lot of trees out there with bark at handlebar height that needs to be loosened with my dirtbike! Can't afford to retire until AAPL hits $500. :-) As for RTFM read Lowell Gilbert's post in this thread where he points out its mentioned in only one place in the docs that they were using the term "CSMA/CD MAC" everywhere in the documentation no matter CSMA/CD didn't apply when the MAC was configured Full Duplex. So if you didn't fully grok the #include file you didn't have the proper macro definitions to rewrite what they were saying into what they meant. :-( -- David Kelly N4HHE, dkelly@HiWAAY.net ======================================================================== Whom computers would destroy, they must first drive mad.
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