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Technology Stocks : PairGain Technologies -- Ignore unavailable to you. Want to Upgrade?

To: John Stichnoth who wrote (31099)	5/8/1999 11:23:00 AM
From: Jim S	Read Replies (1) \| Respond to of 36349

Six months or more ago, there was a pretty fair discussion (at least, to my feeble ability to understand such things) regarding digital data transmission over commercial power lines. It was on one of the "What The Heck Is DSL" type threads. Some engineer (at least he had me convinced he was an engineer) brought up a lot of problems with using power lines: -they are mostly above ground, and susceptible to atmospheric RF problems, including lightening and broadcast signals, as well as shifting impedance due to humidity, temperature, and even birds. -low frequency transformers and filters present huge obstacles to high frequency signals -where multiple power lines converge, there is a lot of cross induction and HF interference -spikes; every time there is an air conditioner or arc welder in use, there are surges and spikes that affect the carrier frequencies for the high frequency data So, maybe someday your friendly power company will offer data service too, but that is probably too far down the line (pun intended) to get charged up about. :-) jim