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To: Frank A. Coluccio who wrote (23007)6/6/2000 3:02:00 PM
From: gpowell  Read Replies (1) | Respond to of 29970
 
These upstream limitations exist in the lower end of the cable spectrum (between 5 MHz and 40 MHz). Note that the new interactive services and digital TV services which will use STBs instead of cable modems, which are beginning to roll out now, are situated in the higher end of the spectrum, typically between 500 MHz and 800 MHz.

This is news to me. I thought the new STBs were DOCSIS compliant. That would force all upstream, whether from modem or STB onto the DOCSIS defined upstream spectrum (5 MHz and 40 MHz).



To: Frank A. Coluccio who wrote (23007)6/6/2000 6:37:00 PM
From: KailuaBoy  Read Replies (1) | Respond to of 29970
 
Frank,

I get it. The channels designated for upstream are few because of the standards that were put in place when upstream wasn't a consideration. Would 5-40 Mhz correspond to channel 1 on a TV tuner? Break this spectrum up into 6 Mhz pieces, throw out the extreme low-end and high-end and say you have 15-30 Mhz of usable upstream spectrum and you could have a problem given a lot of upstream traffic.

Thanks,

KB


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