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Technology Stocks : Ascend Communications-News Only!!! (ASND)

ASND 223.73

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Jan 29 3:59 PM EST

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To: Finder who wrote (330)	10/16/1997 5:49:00 PM
From: Maverick	of 1629

Vint, Part IV LT: Please compare MCI's use of ATM in the backbone against Sprint's planned use of PPP over Synchronous Optical Network [SONET] running at OC-12 speeds. Cerf: Well, I once would have said that the PPP over SONET was the better way to go because you get more bandwidth out of the same line. You give up something free on an ATM channel. But we can make use of ATM as a Level 2 network to do topological adjustments to the way routers are interconnected. Whereas if the routers are hooked up on SONET lines, that's it. You have a physical connection from router A to router B and no further questions asked, where virtual circuits in an ATM network give you a little more flexibility. It also actually lets us steer traffic around for load sharing across routers. So, I'm not sure that my engineers will give up a Level 2 network too quickly. I'm still of the belief that an underlying Level 2 network is beneficial until we get a lot more dynamics in the routing protocols to do load sharing. LT: Does it matter to ISP [Internet service provider] customers whether ATM or SONET is used in the backbone? Cerf: If the customer has nothing but Internet traffic, PPP over SONET is a perfectly attractive way to go. But if the customer has different kinds of traffic, some of which is voice and some of which is data, ATM switching is very attractive because you can put some upper bounds on the delay that the interactive traffic might encounter. It's especially important in voice to avoid long delays, otherwise you get echo problems and that's what cells are supposed to help you with. LT: I'm hearing a lot from MCI about bandwidth, but not about Resource ReSerVation Protocol [RSVP], Real-Time Control Protocol [RTCP], and other mechanisms that intelligently use bandwidth. Why is that? Cerf: We have been experimenting with RSVP with Cisco and Intel [Corp.]. I spent last year and part of this year working on it. We concluded that RSVP needs to be abstracted from its history because it was originally developed to support multicast. We think RSVP is important--we just think that it shouldn't be commingled with multicast.

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