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To: Tunica Albuginea who wrote (13076)	8/28/1999 1:34:00 AM
From: fumble	Respond to of 18016

<<fumble, interesting post.Are you saying that - The Cerent switch is primarily software based? - functioning on a mathematical statistical basis? - nad because of that it is less reliable for a) QoS and b) to build / design a network on? Also that ATMs are more hardware based and thus more predictable/reliable and thus better QoS and basis to design/build networks on?>> I did not say anything about Hardware vs Software. That is not the issue. It is the logical design. A statistical multiplexer merges various streams of data onto a single high speed stream. It works when the high speed stream bandwidth is greater than the sum of the mergee stream bandwidths. The question is what happens when this condition is not true. If there is no information carried by the incoming packets which would enable the switch to know which packet(s) can be discarded, then you have a problem. Testing and debugging such a system can also be a problem (it is nice to be able to repeat a problem situation for analysis). An ATM network works because all the packets move through virtual connections. These virtual connections are set up on the fly with specifications indicating the QoS desired (and paid for) by that particular customer.