Researchers See Gigabit Data Over Power Lines
Wed Jan 5, 2005 04:23 PM ET
WASHINGTON (Reuters) - Engineers at Penn State University said on
Wednesday they had found a way for power lines to transmit data to
homes at rates far faster than high-speed Internet connections from
cable and telephone companies.
Broadband service over power lines has been highly touted by
equipment makers and federal regulators as a possible competitor to
cable and telephone services that handle nearly all of the 30 million
U.S. residential broadband connections.
But despite dozens of trials, few electric utilities have
attempted to sell the service to customers, citing cost and technical
problems. The Penn State researchers said while the technology would
improve, lowering the costs of power-line broadband would remain
Power-line broadband systems available today typically promise
data speeds of roughly one megabit to three megabits per second,
similar to cable and digital subscriber line, or DSL, service.
The Penn State engineers, Pouyan Amirshahi and Mohsen Kavehrad,
estimated in a research paper released Wednesday that their system
could deliver data at close to one gigabit per second over
medium-voltage electrical lines in ideal conditions, with speeds of
hundreds of megabits per second available to home users.
Their system would uses repeaters placed every one kilometer,
(0.62 miles) and requires power lines to have been modified to reduce
interference with the data signals. The engineers said their estimates
were based on computer models, and that the data speeds available in a
real-world version would depend on how many repeaters a power company
The Penn State study was funded with a grant from AT&T Corp. (T.N: Quote, Profile, Research) , which has taken part in prior trials of power-line broadband.
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