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Technology Stocks : The New QLogic (ANCR)

QLGC 16.07

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Aug 24 5:00 PM EST

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To: Craig Stevenson who wrote (10636)	10/1/1997 10:54:00 AM
From: nic	of 29386

Craig, I actually saw classes 4 & 5 described in an old Byte article (Feb'97, page 40IS11) - I think I mentioned that when I posted about it back in spring. Here is the relevant section from Byte: Class 4 provides a simultaneous exchange of data packets between two participants in a network by utilizing several routes so that bandwidth is guaranteed. This service class is particularly beneficial in a fabric where the load changes continuously but connections must have a minimum data transfer rate. In this case, the remaining bandwidth can be used by other applications. Class 5 service allows for simultaneous (isochronous) data transfer to several participants and is especially applicable for audio and video servers in broadcast mode. Except for class 1, all classes require a fabric network. Class 4 and 5 specifications are not yet fully fleshed out. Taking this & your info together, classes 5 & 6 look very similar - maybe they were alternative, incompatible proposals for implementing multicasting, and class 6 won out? I also conclude that class 4 must be providing a circuit that is both fractional and virtual ("several routes"). - nic

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