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Technology Stocks : LAST MILE TECHNOLOGIES - Let's Discuss Them Here
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To: ftth who wrote (2524)12/10/1998 8:37:00 AM
From: Hiram Walker   of 12823
 
Dave, a few other things, the node size is dropping fast,TCOMA is going to 250 or under per node for ATHM for advanced services. They can do this without much physical alteration using advanced optoelectronics with invisible hubs.
On the upstream QPSK is more robust than QAM,but takes up more bandwidth and is less efficient. I personally would go with QAM 16 or 64 if I could upstream with an HFC system. Most cable modems are using QPSK upstream from what I have read(LANCity).
There are so many tradeoffs and issues concerning modulation techniques,that it is hard to know what the head engineers at each cable company are thinking. But if you decide not to upgrade to 2 way HFC,s-CDMA is a way to get enough robustness to do it over coax.
Hiram
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