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Technology Stocks : Ascend Communications (ASND)
ASND 212.33+1.1%Nov 28 9:30 AM EST
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To: Pullin-GS who wrote (28564)12/23/1997 1:01:00 PM
From: The Phoenix  Read Replies (1) of 61433
 
Paul?

O.K. :) I agree with everything you said. So, where did all this start? If I recall it had something to do with the success or appropriatness of using ATM as a backbone fabric versus TCP/IP. I hold the belief that until TCP/IP can guarantee QoS, ATM and it's inherent ability to do so will be the preferred backbone fabric. True there is cell loss in ATM but the performance of this fabric outweighs this limitation. Let's review:

1 - ATM allow multiple service types to share a common medium.
2 - ATM provides superior performance for this traffic.
3 - By assuring fairness and creating a predicatble environment.

Also:
1 - ATM provides superior performance for data only traffic. How?
2 - No error correction or associated overhead is required. How?
3 - Layer 3 end-points assure data integrity.

Today IP can not address these issues. This is not to say that it won't...just that it doesn't yet today. We can talk about standards until we're blue in the face, the fact is ATM is delivering today...in carrier nets, and in enterprises around the world. Multiservice IP nets are experimental right now and success is spotty. Furthermore the rules built into a successful multiservice IP net will require a complete overhaul of backbone networks which will take years to build out. Thus my point that ATM will continue to be the backbone fabric of choice for years to come.

(Note that IP has packet loss as well it just corrects for it...but why do this in the backbone network node to node when the end points take care of it? Furthermore, between nodes in the backbone we have fiber where cell loss is practically nil. Burdening switches with error detection/correction would then only add overhead and reduce performance with no benefit. Error correction is really only neccessary from user to carrier POP to correct for any loss on the local loop - typically still copper. This again points to the peference for using ATM in the backbone and IP at the network edges.)

Gary
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