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To: pcstel who wrote (115793)	3/20/2002 12:56:05 AM
From: mightylakers	Respond to of 152472

pcs, So it appears you want the Base Station to serve the subscriber unit as fast as possible, but are not concerned that the fixed network will lack the capability to serve the Base Station at the fastest possible rate??? Read my statement one more time, 2.4Mbps is hard to maintained due to the mobile nature. I'm talking about the average throughput here. And if you don't want the BTS to serve the users as fast as possible, that average throughput will go down. Data by itself is a bursty nature of application, especially with multiple users, you will suffer greatly if you don't take advantage of it. OK! That's 3 T1's per BTS per EV-DO carrier (3 sector cell)! $1800 per month per BSC in backhaul fees. I think you are oversimplified the case here. Lease a T1 line or not is really depending on the location, the demand and availability. I think you have ignored the fact I presented to you in another post about using All-IP backbhaul which will cut the cost/bandwidth greatly. As a matter of fact, in 3G networking, ATM and frame relay are being used greatly as a mean to interconnect the radio access networks. In those type of networks, the cost ratio on the network side is much smaller. This can be especially useful for the WLL type of wireless data market. Because you have a pretty clear idea of the demand therefore easier task to manage the capacity. All they know is that it used to be fast, and now it's slow and they will want "the problem" fixed! It's only human nature! Just the contrary IMO, it's like going to a store which is on sale, they will view that cheap price as a lucky bargain instead of a forever thing. Same holds true for the data users, they will say hey I got 100kbps even though I paid for 60kbps and feel good about it. And that is the real human nature. As a matter of fact, in initial deployment stage! You may only need to add one additional T1 per BSC with a 60-80kbs moderated service, and increase your backhaul commitments as usage grows on a subscriber basis It's all about demand, the usage distribution etc. If you think you don't have much of demand in one are, then you don't even install that many BTS anyway. You may also install omnicell instead of 3 sectors. It's all dynamics. Like I said, the radio equipment is much more expensive, heck even the land fee might cost your more money. And with All-IP backhaul you are much much more flexible to manage your backhaul capacity. Oh and one more thing, it is almost impossible to moderate a DO device, because even if it asks for say 76Kbps, it may still get 4 times faster. It's a physical layer thing.

To: pcstel who wrote (115793)	3/22/2002 11:01:39 AM
From: Keith Feral	Read Replies (2) \| Respond to of 152472

PCSTEL: Remember our conversation about Soma the other day. I was looking through the old slide shows to find a picture of the Sharp BREW phone and found a slide talking about MMDS/CDMA2000 1XEV DO for residential areas. qualcomm.com I am very happy to see that Qualcomm is moving rapidly to put together a CDMA product for wireless cable spectrum (MMDS). The FCC has already authorized the MMDS spectrum for 3G mobility between 2500 and 2690 MHZ. I don't know how much longer before the market starts to talk about this spectrum. Gilder said that Soma would ahve some proudct announcments in March. I think that Airvana could exploit this market very aggressively with the help of Nortel. Someone is going to kick ass with all this spectrum which can deliver wireless voice, broadband, and cable.