IP: : Data Delivery Record Shattered

[David Farber <dfarber () earthlink net>]

-----Original Message-----
From: TruChaos () aol com
Date: Sat, 23 Mar 2002 15:04:11 
To: farber () cis upenn edu
Subject: Data Delivery Record Shattered


    
Bell Labs Says It Shatters Data Delivery Record 
Fri Mar 22, 3:51 PM ET NEW YORK (Reuters) - Bell Labs, the research arm of 
Lucent Technologies Inc. said on Friday that it has doubled the distance and 
the speed at which data can be sent over long-haul telecommunications 
networks.       
The development will eventually make it cheaper for telecommunications 
service providers to send more data on fiber optic networks over longer 
distances. Bell Labs said that, in a demonstration, it sent a massive 2.56 
terabits of data per second over a distance of 2,500 miles, the equivalent of 
sending the contents of 2,560,000 novels every second across the United 
States. One terabit is a little over 1 trillion bits of data. The previous 
record was 1.6 terabits per second over 1,250 miles, or half the distance. 
Bell Labs achieved the 2.56 terabit-per-second speed by sending 40 
gigabits-per-second of data over each of 64 separate channels in fiber optic 
cable, which uses light waves to carry data. It used dense wave division 
multiplexing, a technology that allows service providers to push bigger 
chunks of data onto a single strand of optical fiber. The capacity and 
distance improvement was made possible by use of a coding scheme called 
differential phase shift keying, which Bell Labs has developed for 
high-capacity communications. Lucent's current long distance networking 
product, the LambdaExtreme, cannot support the higher data speeds but a 
spokesperson said the Murray Hill, New Jersey-based networking company will 
incorporate the improvements into future products. 

    



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