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To: Frank A. Coluccio who wrote (3082)	11/4/1999 4:19:00 PM
From: Robert Sheldon	Read Replies (1) \| Respond to of 15615

It probably means that they are sending smaller bundles (OC3, OC12 etc) collectively over a larger 192. Yes, my discussion with the company led me to believe that increments of DS3 could be accommodated. Let's see if they actually do it – which is another question. Or, it may mean that they are mapping IP directly onto SONET at 192, but 192 is still way too fast for routers to catch up to where lookups and policy decisions are concerned. They are still mapping onto SONET but stated that SONET is on the way out due to the router issues you raise (packet egress and ingress). Like I said, ATM is dead, and SONET is headed out in a few years time. This is a revolution that has kept my adrenaline flowing for months now. A lot of capital will be lost over the next few years for companies dependant on ATM and SONET related equipment sales. Makes you wonder why $7BB was forked over for Cerent – maybe they have some new patents that were the real target and the business case to appease analysts was based on the SONET related business. Who knows.

To: Frank A. Coluccio who wrote (3082)	11/4/1999 5:10:00 PM
From: JDN	Read Replies (1) \| Respond to of 15615

Dear Frank: sheldon answered you better than I could have JDN

To: Frank A. Coluccio who wrote (3082)	11/4/1999 6:31:00 PM
From: Mr.Fun	Read Replies (3) \| Respond to of 15615

Frank, The Lucent NX-64000 does, in fact, map IP directly to SONET at OC-192 speeds. In GBLX's trial, they ran live traffic at OC-192 between Chicago and Cleveland. I spoke with some of the Nexabit engineers in Geneva, and I gather the following: 1) Nexabit has solved a fundamental bottleneck in shared memory architecture that allows them to read and write to and from a huge memory block at a fixed 40 microsecond delay, regardless of packet size, including a full table look-up. This is apparently a huge breakthrough. The Nexabit guys actually claim that they can do this not only at OC192, but also at OC768 (40Gbps) making the box scalable to 6.4 Tbps once "the optics catch up with the switch design" 2) The routing software (BGP4, OSPF, RIP, IS-IS) was written by the team that wrote Wellfleet's (Bay) original router code. They quit en masse in 1997 to join the fledgeling Nexabit. I hear from folks at T that the code is clean and bug-compatible with Cisco.