ATM vs. Gigabit Message Board

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Technology Stocks : ATM vs. Gigabit

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To: Steve Scribe who wrote (13)	8/4/1997 12:06:00 PM
From: George Dawson	of 63

Another major complication with GE and CSMA/CD is TOF (Time of Flight) restriction. I just read through "A Survey of Emerging, High-Speed Interconnect Technologies" by Bob Deri of LLNL. It was given as a workshop dated May 11, 1997. He points out that: -At 10Mb/s, CSMA TOF restriction allows 5 kn LAN diameter. -At 1 Gb/s, CSMA TOF restriction allows only 20 to 30 m LAN diameter. The white paper at the GE Alliance home page points out that work is being done to extend this to 100m. If you think about it this is a very serious limitation. It means that your server needs to be in fairly close proximity to everything else on your LAN if you want to get Gb speed out of GE. If FC component prices come down, it should be very competitive with GE - you will be able to make a larger LAN with FC switching. Deri does point out that solutions to this problem have been proposed including: - 8X "carrier extension" -"packet bursting" or combining short frames to improve efficiency -"buffered distributor" - collapse the collision domain into a box To my knowledge, none of these solutions is available in a commercial GE switch.

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