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To: ahhaha who wrote (10882)	6/9/1999 4:20:00 PM
From: DOUG H	Read Replies (1) \| Respond to of 29970

Ahhaha, Thank you for that informative post.

To: ahhaha who wrote (10882)	6/9/1999 4:59:00 PM
From: FR1	Respond to of 29970

Thanks for that post. I am sure others appreciate it too.

To: ahhaha who wrote (10882)	6/9/1999 5:04:00 PM
From: E. Davies	Read Replies (2) \| Respond to of 29970

Great post. Plain English! Didnt think you had it in you <g>. Couple questions and/or clarifications to bring out for the more technically advanced to answer: The home drop is connected to the pole hung cable and that cable runs around the neighborhood covering up to 500 houses in the usual model. We refer to this as the local loop. It has to be wired in HFC which is a optical fiber hybrid. As far as I understand it the cable modems which drive the loop connect to standard coax cable (higher quality than the one inside the home obviously). No optics are involved until the headend->data center connections. I dont know if the wires in the local loop need to be replaced when upgrading the architecture to HFC, but I do know the electronics do need to be replaced so that the amplifiers allow a return upstream path. Both of these streams can be put on one channel. This might be misinterpreted. You cannot put upstream and downstream on the same frequency. Nor can you put upstream in a frequency range used for downstream. Upstream can be placed below normal TV spectrum and above it as well (Correct dave/frank?). I think (not sure) that current DOCSIS modems only use frequencies below the normal TV spectrum. Is there enough room in the portion of the spectrum allocated or designated by the FCC to accommodate say 10 major ISPs? The answer is yes. Upstream bandwidth is currently pretty limited and lots of uses are planned for it. I dont think you can easily say that there is enough to support 10 ISP's. Why do you think ATHM has throttled upstream bandwidth already? Even coming up with 10 downstream channels would be a major organizational headache, but I'll bet they are there somewhere. Eric

To: ahhaha who wrote (10882)	6/9/1999 7:45:00 PM
From: DOUG H	Read Replies (1) \| Respond to of 29970

ahhaha, Thanks again for your upstream post. A fundemental piece of this puzzle that I am having trouble with is understanding channels: <<<<The drop which is the connection between the telephone pole supported black inch thick cable tv cable can carry about 100 6 MHz analog tv channels and 500 6 Mhz digital channels. We could say that any of those channels could carry a cable modem broadband signal. Depending on technology maybe we need two of them, one for upstream, one for down stream. Downstream is reception of signal. Upstream is response like clicking a link and getting a response from the remote site computer. The reaction from the remote computer comes back through the downstream channel. Both of these streams can be put on one channel.>>>>>> I see references to 6 MHz to 100 MHz channels and or spectrums. Can you give me a quick lesson please. Thanks D.H.