I have read all the specs since DOCSIS 1, and also done work on the OFDM transceiver for the latest creation. There are two major nails in its coffin that make it unsuitable for use over the air, the first is that is assumes a near perfect channel, the second is it has no knowledge of multi-path or fading, as cable systems do not require…
I have read all the specs since DOCSIS 1, and also done work on the OFDM transceiver for the latest creation. There are two major nails in its coffin that make it unsuitable for use over the air, the first is that is assumes a near perfect channel, the second is it has no knowledge of multi-path or fading, as cable systems do not require it. I would suggest as far as using it for amateur radio, let sleeping dogs lie.
Sure. No one is suggesting putting cablemodems on the airwaves (although IIRC WiMAX had a lot of similarities with DOCSIS). I was thinking more along the lines of the handshake that takes place where modems and CMTS devices come to an optimized state of operation as an example of a possible way to get the SuperPeater and terminal radios to function.
Martin - There have been at least two significant adaptations of cable modem technology to non-cable radio that I'm aware of (neither of which persist to the current day). The first was my friend Dewayne Hendricks WA8DZP (Silent Keyboard) use of Com21 cable modems on Amateur Radio spectrum (or maybe not - I forget) in the Bay Area to provide Internet Access at broadband speeds to bunch of friends. The second was a radio manufacturer for Broadband Internet Access, whose name escapes me at the moment, who simply added a transverter to a cable modem. Their usage was envisioned for the never quite realized Sprint-owned spectrum at 2.5 - 2.7 GHz (the former MMDS band) that presumably would have been "quiet and stable" enough for cable modems to work.
I have read all the specs since DOCSIS 1, and also done work on the OFDM transceiver for the latest creation. There are two major nails in its coffin that make it unsuitable for use over the air, the first is that is assumes a near perfect channel, the second is it has no knowledge of multi-path or fading, as cable systems do not require it. I would suggest as far as using it for amateur radio, let sleeping dogs lie.
Sure. No one is suggesting putting cablemodems on the airwaves (although IIRC WiMAX had a lot of similarities with DOCSIS). I was thinking more along the lines of the handshake that takes place where modems and CMTS devices come to an optimized state of operation as an example of a possible way to get the SuperPeater and terminal radios to function.
Martin - There have been at least two significant adaptations of cable modem technology to non-cable radio that I'm aware of (neither of which persist to the current day). The first was my friend Dewayne Hendricks WA8DZP (Silent Keyboard) use of Com21 cable modems on Amateur Radio spectrum (or maybe not - I forget) in the Bay Area to provide Internet Access at broadband speeds to bunch of friends. The second was a radio manufacturer for Broadband Internet Access, whose name escapes me at the moment, who simply added a transverter to a cable modem. Their usage was envisioned for the never quite realized Sprint-owned spectrum at 2.5 - 2.7 GHz (the former MMDS band) that presumably would have been "quiet and stable" enough for cable modems to work.