Copper cable transmission rate increased

Published: Nov. 28, 2007 at 11:07 AM
STATE COLLEGE, Pa., Nov. 28 (UPI) -- U.S. engineers are working to increase the data transmission rate of Category-7 copper cables used to connect computers to each other and the Internet.

"Working with NEXANS, the company that manufactures the cable, we have examined the possibility of sending digital data at a rate of 100 gigabits per second over 100 meters of Category-7 copper cable," said Pennsylvania State University Professor Mohsen Kavehrad.

Category-7 copper cables are used to connect computers within a room or a building or to create parallel computing systems, the researchers said. While the long distance lines of most Internet systems are glass fiber optic cables, which are very fast, copper cables are generally used for short distances.

The engineers modeled the cable with all its attributes including modeling crosstalk. They then designed a transmitter/receiver equipped with an interference canceler that could transfer up to 100 gigabits using error correcting and equalizing approaches.

"A rate of 100 gigabit over 70 meters is definitely possible, and we are working on extending that to 100 meters, or about 328 feet," graduate student Ali Enteshari said.

Enteshari presented the research in Atlanta earlier this month during a meeting of the IEEE High Speed Study Group.

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Portable fingerprint ID technology unveiled in Fairfax, Virginia
Lt. Vince Byrd, of the Fairfax County Police Department, holds a portable Automated Fingerprint Identification Systems (AFIS) at the Fairfax County Police Headquarters on November 28, 2007. The AFIS is designed to be used by officers on the street and has the ability to record fingerprints and photos in the field while cross-checking the national capitol area's database, which includes over a million records from northern Virginia, the District of Columbia and Maryland. (UPI Photo/Kevin Dietsch)
Portable fingerprint ID technology unveiled in Fairfax, Virginia