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Technology Stocks : Adaptec (ADPT) -- Ignore unavailable to you. Want to Upgrade?

To: Starowl who wrote (958)	1/27/1998 9:11:00 PM
From: George Dawson	Read Replies (1) \| Respond to of 5944

Starowl, I have looked at the GigaLabs information and if it works as advertised it is very interesting. I have a few reservations and would appreciate the input of any SCSI engineers: 1. The per port cost is about 4x the per port cost of current fibre channel switches offered by Brocade or Ancor, and much more than FC hub devices. The backplane of an FC switch is much larger (32 - 128 Gbps). 2. The distance limitations of SCSI bus length appears to be overcome by switch cascading on the one hand (doubling bus length by using a switch), but for the remote clustering or mirroring it is much less clear. The diagrams suggest that the SCSI switch can transport SCSI protocol over fibre or over a WAN to a remote site 20 km or greater to a remote site. The specific technology change that allows this to happen is not explained in their white paper. The Adaptec book: "Understanding I/O Subsystems" by W. David Schwaderer and Andrew W. Wilson, states that the fibre channel advantage of long distance high speed transmission depends on the 8B/10B encoding scheme (p 178) in that neutral disparity of the data transmission stream is maintained. Despite this theory - more data is needed on how this system works compared to a switched fibre channel fabric. George Dawson