On Thu, May 10, 2001 at 11:12:21AM -0400, Greg Maxwell wrote:

On Thu, 10 May 2001, John Fraizer wrote:

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Anyone know any good articles on 10GB ethernet? I am specifically intrested if they have removed some of the legacy requirements that hamper gigabit ethernet (such as a default MTU of 1500, half-duplex, etc.)

Half-duplex? The last time I checked, my GigE equipment didn't default to half-duplex.

No I wouldn't expect it to, nor did I state anything about defaulting to half. There is no purpose for half-duplex in GIGE, even the few GIGE hubs I've seen are buffered and user congestion control to allow full duplex operation. The possibility of half-duplex mode just adds unneeded cruft and additional failure modes.

If it didn't support half-duplex, it wouldn't technically be 802.3 ethernet. Full duplex is what happens when you remove CSMA/CD. I'm sure 99% of people out there have absolutily no need or desire for half duplex gige or 10gige, and I'm also sure 99% of people out there would be far better served by a larger MTU. Unfortunantly it's the other 1% at IEEE who write the spec. -- Richard A Steenbergen <ras@e-gerbil.net> http://www.e-gerbil.net/ras PGP Key ID: 0x138EA177 (67 29 D7 BC E8 18 3E DA B2 46 B3 D8 14 36 FE B6)