Piller
join:2006-10-11
Sacramento, CA
1 edit | Could already be causing problems...
"Typically home-control power line communications devices operate by modulating in a carrier wave of between 20 and 200 kHz into the household wiring at the transmitter." Wikipedia.
Peeps are already doing this with X10 and INSTEON.
Looks like this operates right in the middle of dsl.
Oops spoke too soon..."PLC modems transmit in medium and high frequency (1.6 to 80 MHz electric carrier)." |
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MacLeech
The one and only
Premium
join:2001-07-14
SoCal
4 edits | said by Piller  :Oops spoke too soon..."PLC modems transmit in medium and high frequency (1.6 to 80 MHz electric carrier)." Right in the requency range used by cable modem upstream data channels....
Good thing cable lines are nowhere near powerlines to pickup the interference that would cause and cable distribution networks are "perfect" closed systems not prone to outside interference...  |
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en102
Canadian, eh?
join:2001-01-26
Valencia, CA | Cable is sheilded.
I suspect twisted pair (POTS/DSL) may see more interference than Cable.
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Canada = Hollywood North |
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MacLeech
The one and only
Premium
join:2001-07-14
SoCal
4 edits | said by en102 :Cable is sheilded. I suspect twisted pair (POTS/DSL) may see more interference than Cable. Never seen a device which links the electrical system in your house with the cable system?
Look at your TV, cable box, VCR, cable modem, etc.... how many do you think are designed to prevent cross talk in those frequency ranges when powerlines never used those frequencies before?
Beyond that cable shielding isn't always effective, especially when people are using twist on connectors, bare coax shoved into the coax connector on their TV, dog chewed cable, and all sorts of other dumb things I troubleshoot on a DAILY basis.
ANY time the center conductor on the coax is exposed, ingress is possible. It happens alot more then you may think.
It's a DAILY duty of cable maintenance techs to monitor and fix ingress issues. I already spend enough time tracking down the HAM, CB, and other signals getting into the system.
Having hundreds of miles of unshielded powerline transmitting a signal just a few feet from the cable distribution system in the frequency range used for return communications is guaranteed to cause problems. Good luck trying to find the ingress point when the source follows almost the entire cable distribution system.
Ever read a complaint here on DSLR from a cable user suffering from intermittent connections or packet loss that tech support and local techs can't seem to fix? Alot of those are caused by noise getting into the cable system. |
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en102
Canadian, eh?
join:2001-01-26
Valencia, CA | Yeah - it would have access to noise at the endpoints (devices / unshielded points). I can relate to the poorly done coax connectors.
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Canada = Hollywood North |
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Dude111
An Awesome Dude
Premium
join:2003-08-04
USA
1 edit | 
This BPL crap has to go.......
I am starting to think they wanna do this ON PURPOSE so we cant enjoy our HF bands anymore!!!!
I talk on 11 meters quite a bit and i dont want it screwed up by this trash!!!! |
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