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Technology Stocks : Qualcomm Moderated Thread - please read rules before posting -- Ignore unavailable to you. Want to Upgrade?

To: Peter J Hudson who wrote (9316)	3/30/2001 11:42:24 AM
From: engineer	Read Replies (2) \| Respond to of 197226

The newer switches are going to IP based, but I do not think they will obsolete the circuit switched 5ESS swtiches that are prevalent in the industry for quite awhile. First we need IPV6 in place before we can handle the IP address load and then we need the IP backbones to handle real time IP data and near 0 latency. This takes a much more dedicated routing scheme than we have today. One where the entire voice channel is allocated to a private fibre channel, sometimes across the entire USA, to insure that they do not get routed to another couple of hops and introduce more than the allowable 150ms round trip latency for voice. As the level of IP traffic grows, then perhaps we get to the point where the IP back bones can handle "circuit switched" concepts on the IP backbones, thus dedicating a fixed routing which stays constant over the entire network. As it stands today, the IP routers have little or no concept of latency. So in order to make this a reality, they need to either build entire systems of dedicated channels with redundancy, or they need to make alot smarter routers which can test an alternate route for the hop latency and establish a latenty cost of each handoff before they move the IP traffic to that hop. The IP switches are not quite there yet. I can see this coming into play in 2-5 years, but for now, the IP back bone will probably be separate from the voice back bone. I had thought that for HDR, the system is designed so that it makes use of latency to increase the thruput. This would say that they would use the regular IP back bone and regular IP routers off the shelf. Same for 1x packet data. Very low cost to add a $3500 Cisco router into a basestation and hook it to some i-node if you do not have to worry about latency, just connectivity and thruput. Besides, the carriers have $B's invested into the 5ESS switches and they have not amortized them off yet. Alot of them only bought them in 1995 thru 1997 and this is way too short for them to scrap them yet.... But then what do I know....just my humble opinion...<gg>