Date: Sat, 27 Sep 1997 12:13:14 -0400 (EDT) From: "John T. Farmer" <jfarmer@sabre.goldsword.com> To: hackers@FreeBSD.ORG, stable@FreeBSD.ORG, tlambert@primenet.com Cc: dg@root.com, jfarmer@goldsword.com, rgrimes@GndRsh.aac.dev.com, tarkhil@mgt.msk.ru Subject: Re: 'fxp' driver/hardware lossage (was Re: Alexander B. Povol's mail) Message-ID: <199709271613.MAA17779@sabre.goldsword.com>
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On Sat, 27 Sep 1997 11:42:14 +0000 (GMT) Terry Lambert said: [somebody else...] >> } Only broken NIC chips are simplex, even the 82586 is actually capable >> } of hering itself talk on the wire, though most drives do not set >> } the chip into this mode. Either way ``ethernet is _not_ a simplex >> } device''. >> >> That's only true of coaxial media. Over twisted pair, if you see >> data start arriving on the receive pair while your transmitting then >> you have to assume that the data is being sent by another station >> and you've got a collision situation. > >Isn't this the hub's responsibility to distinguish and prevent? > A hub that does this is usually called a "switch" :^> However, a hub that supports full-duplex links _must_ deal with some of the collision issues but a simpler level than a switch does. John ------------------------------------------------------------------------- John T. Farmer Proprietor, GoldSword Systems jfarmer@goldsword.com Public Internet Access in East Tennessee dial-in (423)470-9953 for info, e-mail to info@goldsword.com Network Design, Internet Services & Servers, Consulting
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