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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 challenging.
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
used.
The Penn State study was funded with a grant from AT&T Corp. (T.N:
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, which has taken part in prior trials of power-line broadband.
© Reuters 2005. All Rights Reserved.
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