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To: The Phoenix who wrote (28603)	12/23/1997 2:55:00 PM
From: Pullin-GS	Respond to of 61433

I agree with everything you said. So, where did all this start? Sorry....I was attemping to spark a discussion on the current weaknesses of ATM (of which error correction is not one of them IMO...I just needed to state what error correction implies regarding the concept of reliability).:-) I agree that ATM potentially can offer a dynamic backbone in which data types have no meaning. But at present due to the current standards in place (PNNI1.0, MPOA1 specifically) and there components, much of the publicized QoS and dynamic allocation of SVCs is not available due. IP over ATM is also far from utilizing the full capability of ATM and will not happen until a standard evolves that merges the capabilities of current IP routing technolgies with those of layer 3 ATM (The PNNI specs). You have stated several times: 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. Given your thoughts about ATM, can I ask you to go though a network design excersize? Don't feel an obigation to do so. I realize this is asking alot. One gotcha though: 1)ATM must be used for your MAN/WAN. 2)You must explain the components in resonable detail, incuding: a)applications b)ATM switch interface(s) to customer DTEs c)A breif overview of your ATM network configuration chosen. I will do the same, but I will utilize another backbone technology. The customer requirments: 1)You are asked to architect an Enterprise network (data/voice/video) over a metropoliten area of, say, the north east USA. 2)One home office location of 4k users 3)You are given 8 regional offices of major user popolations (1K users each) 4)Each user is given a single phone line. All phone systems are PBX (Lucent) based. Bandwidth requirements are a maximum total 5Mbps comming into switch at each region. A T3 for the home office. All long distance services route through the home office. Don't be concerned with long distance in design. 5)Each user has a 100Mbps data connection (you pick the media). WAN Data requirments are 20Mbps for each region. 6)Each site has 200 users that require desk-top video, and each site has 2 video conference centers. You pick the generic applications/media. You estimate the resources needed for 25% use of desktop video resources, 50% use of conference centers. 7)Internet access is a requirement. T3 for what it's worth. 8)WAN data/voice/video traffic patterns for all sites are split up 50% to home office, and the remaining 50% spread evenly to the other regional offices.