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Technology Stocks : The New QLogic (ANCR)

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Aug 24 5:00 PM EST

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To: Andrew who wrote (12497)	11/15/1997 10:49:00 AM
From: George Dawson	Read Replies (1) of 29386

Andrew, I don't think it is that obvious. The major difficulty this creates for GE vendors is that they can't sell the idea that you can simply drop a GE switch into your existing LAN and expect it to work as advertised. Even the author of this SUN article points out that for most people installing GE will require significant recabling: sun.com He also makes the point that in terms of fiber, going from single mode to multimode, cuts down your effective LAN diameter with ATM from 20 k to 2 k. With FC the maximum distance is 10 k for gigabit speeds and 30 k for quarter speed FC. If you go to the technical FC information on the Ancor site: ancor.com - you find the following data: Single Mode Fibre 100 MB/s up to 10 km 1062.5 Mbaud Longwave laser 50 MB/s up to 10 km 531.25 Mbaud Longwave laser 25 MB/s up to 10 km 265.6 Mbaud Longwave laser 50-Micrometer Multimode Fibre 25 MB/s up to 2 km 265.6 Mbaud Shortwave laser 50 MB/s up to 1 km 531.25 Mbaud Shortwave laser 62.5-Micrometer Multimode Fibre 25 MB/s up to 1 km 265.6 Mbaud Longwave LED 12.5 MB/s up to 500 m 132.8 Mbaud Longwave LED I noticed a couple of things: 1. Although GE purportedly has "borrowed" FC's physical layer, they are clearly not equivalent. Neither of the laser wavelengths mentioned in the Sun article (850nm or 1300nm) are in the above standards. 2. GE apparently has no current single-mode standards. I think it would probably take an engineer with a lot of experience in this area to explain why there are differences based on these differences in physical parameters. As a footnote, Sun is high on GE - in spite of the fact that they are one of a few vendors with a high speed ATM card (622 Mbps). They *have* chosen a GE OEM - Alteon.

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