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Technology Stocks : Adaptec (ADPT)

ADPT 17.52

-1.5%

Jan 16 9:30 AM EST

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To: George Dawson who wrote (1701)	4/18/1998 9:13:00 PM
From: Bald Eagle	Read Replies (1) of 5944

<<The latest info I have on maximum bandwidth and LAN diameter is that Fast Ethernet has a maximum bandwidth of 100 Mbps with a maximum transmission distance of 20 kilometers. FDDI has a maximum bandwidth of 100 Mbps with a maximum transmission distance of 100 kilometers. >> Both FDDI and Fast ethernet have a maximum "theoretical" bandwidth of 100MB, I agree. However in reality, because of different communication protocols used, the FDDI has a higher effective bandwidth. I don't know all the details, but where I work we have both fast ethernet and FDDI. The network engineers tell me that fast ethernet effectively maxes out at about 40mbps primarily because of data collisions and retransmission. Where they need higher rates than this, they use FDDI, which they tell me can have an effective transmission rate of 70 to 80mbps. I can get more details, but we would be getting into a very technical area. However, my point is that FDDI does have an effective bandwidth advantage over fast ethernet.

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