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Nov 26 3:59 PM EST

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To: greenspirit who wrote (379)	5/4/1997 6:26:00 PM
From: Paul Engel	of 990

Michael - Re: "ATM & Gigabit Ethernet" ATM is designed to support several different kinds of transmission including audio and video as well as standard "data". The ATM definitions also permit interleaving of transmissions containing these different data structures. Current ATM hardware specifications support transmissions from as low as 25 MHz to well beyond 1 GigaHertz. Gigabit Eheternet, as the name implies, is being designed to support Ethernet at speeds up to 1 GigaHertz. As such, I believe it will contain the standard collision detection and avoidance, back off procedures of the original Ethernet. Ethernet seeems to work fine for homogeneous data transmissions, especially within local area networks. Once the size of a network expands to a much larger physical size (building-to-building, city to city) and different types of data need to be transmitted over the same physical medium, Ethernet begins to suffer performance restricting issues. These are classical "WAN" (Wide Area Network) or "Backbone" applications. The asynchronous nature of ATM transmissions becomes a powerful feature under these latter applications. ATM suffers, however, from the massive infrastructure of Ethernet installations that have been built up over the past 17 years. ATM will never replace that. It should find a solid niche in the very high end of the networking pyramid, providing mixed data transmissions between far-flung physical locations. This is where ATM has and will have advantages over Ethernet. Paul

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