I've been doing a lot reading the last few days on the advantages of "PPP over SONET/SDH" vs "IP over ATM AAL5". The available information bandwidth of roughly 150 Mbps out of 155.5 Mbps with STS-3c/STM-1 makes the PPP over SONET solution very attractive. I understand that SONET facilities are widely deployed throughout the carriers' broadband infrastructures but when will it become practical to run packet data over these facilities? I am aware that Cisco is planning to provide an OC-3/STM-1 interface in the 3d quarter but what about other hardware vendors? When will carriers be ready to support this service? Are multiplexers available or planned for the near future? Are there carrier-to-carrier issues that need to be worked out? Any information on this subject is very much appreciated. Thank you. -Camil ===================================================================================== Camil Samaha Senior Network Engineer Thomson Electronic Information Resources csamaha@teir.com =====================================================================================
I was thinking... as far as my limited knowledge allows.. It seems that PPP or HDLC over OC-3 would be faster than ATM over the same OC-3 circuit, and (at this stage) have fewer interoperability problems. But you can configure PVC's with ATM, working with an ATM cloud, similar to frame relay, no? And if this is the case, then a large backbone-type provider may desire to set up an ATM cloud, making it easy to add POP's (just add them to the cloud), and allow for more layer 2 routing (just configure PVC's between every POP you have, building a full web, and a traceroute would now travel 2 or 4 hops instead of 12...?) instead of some sort of hierarchichal star topology, you'd have a large web... and one more potential benefit to ATM -- won't it scale very well to OC-12? ie, when you want to upgrade your network to OC-12, you'd have no changes to make? just thinkin... and I love it when y'all correct me, I tend to learn a lot :) On 20 May 1996, Camil Samaha/TEIR/Thomson wrote:
I've been doing a lot reading the last few days on the advantages of "PPP over SONET/SDH" vs "IP over ATM AAL5". The available information bandwidth of roughly 150 Mbps out of 155.5 Mbps with STS-3c/STM-1 makes the PPP over SONET solution very attractive. [...]
participants (2)
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Camil Samaha/TEIR/Thomson -
Edward Henigin