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To: Matt Kroll who wrote (496)	8/21/1999 12:07:00 PM
From: Sector Investor	Read Replies (2) \| Respond to of 626

<<Note the distances specified.>> The Gigabit Ethernet equipment from MRVC (Nbase-Xyplex) already on the market uses their CWDM (Coarse WDM) technology and offers up to 8Gbps full duplex over 50KM distance. 8Gbps = 1 GBps (Gigabyte per second) or 5 minutes for a 300GB file. While not close to 8 seconds, the technology is low cost and off the shelf technology available to anyone. This from their website: "Course Wave Division Multiplexing (CWDM) Module. The GFS family offers a unique CWDM module that combines four Gigabit-Ethernet inputs from the switch fabric and multiplexes them onto a single fiber pair. By using multiple optical wavelengths on the same fiber, the CWDM4 module can operate in full duplex mode with a maximum aggregate data rate of 8 Gbps. Transmission distances can exceed 50 kilometers from point to point.The CWDM module of the GFS provides a low-cost alternative to Dense WDM for 0-50 km distances. CWDM uses uncooled DFB lasers that have a 20-nm separation between each wavelength."

To: Matt Kroll who wrote (496)	8/21/1999 4:12:00 PM
From: Frank A. Coluccio	Respond to of 626

Matt, I am inclined to think that the SDSU SGI event was merely a demo to prove the concept, and NOT to demonstrate anything that would suggest that they had recently achieved these operating parameters, or to prove how extensible the SR model is in terms of throughput or speed. It was also a much needed form of public relations (after a long stretch of silence), and PR is an area in which I believe SR could use some help, although I give them credit for trying. The limits to GbE are not as restrictive as the link you supplied would suggest. The operating parameters (of both the glass used and the grades of light sources <LEDs, Lasers, etc.>) which led to those specifications were stipulated for in-building and campus environments largely influenced by the ANSI/EIT/TIA model. I'm referring to the TIA standards 568 through 606 as amended which treat Commercial Building (and campus) frameworks. These standards have had a trance-like hold on design thinking now for close to a decade. This goes back to the time that the ANSI/TIA/EIA groups reclassified in-building twisted pair cabling to Category 3, 4 and 5 specifications, from the earlier Level 1 thru 7 grades, and IBM's "type-x" taxonomies. At that time, they also classified fiber cabling GbE, by the way, is now being specked out at much greater distances by a growing number of DWDM vendors, and will soon become a viable alternative to SONET in both Metro and Long Haul venues. I am aware of a number of folks who are looking to "flatten out" a number of broader Layer 3 routing topologies, in fact, through the use of GbE, as we speak. FWIW. Incidentally, I appreciate the first-hand observations that you bring to the thread. Thanks. Regards, Frank Coluccio