03 May 2010 @ 18:48 

Η Alcatel-Lucent κατέληξε σε ένα τρόπο μεταφοράς δεδομένων στα 300Mbps μέσω καλωδίων χαλκού. Μέχρι τώρα τα αποτελέσματα έχουν αναπαραχθεί σε εργαστηριακό περιβάλλον με τα πραγματικά προϊόντα και τις υπηρεσίες να είναι διαθέσιμες τουλάχιστον σε ένα χρόνο.

Alcatel-Lucent Bell Labs achieves 300 Mbps over 2 DSL lines

Alcatel-Lucent’s research arm Bell Labs has demonstrated a technology that boosts the transmission speeds achievable over just two digital subscriber lines (DSL). In a lab test of ‘DSL Phantom Mode’, Bell Labs achieved downstream transmission speeds of 300 Mbps over distances of up to 400 meters (or 100 Mbps over 1 kilometre). At these speeds, Alcatel-Lucent says service providers will be able to maximise the ability of the existing copper infrastructure. At its core, DSL Phantom Mode involves the creation of a virtual or ‘phantom’ channel that supplements the two physical wires that are the standard configuration for copper transmission lines. Bell Labs’ innovation and the source of DSL Phantom Mode’s increase in transmission capacity lies in its application of analogue phantom mode technology in combination with industry-standard techniques: vectoring that eliminates interference or ‘crosstalk’ between copper wires, and bonding that makes it possible to take individual lines and aggregate them. Further research is being conducted to refine deployment models and determine a specific set of customer premises equipment models compatible with the DSL Phantom Mode technology.

‘Researchers at the company’s Bell Labs demonstrated the 300Mbps technology over a distance of 400 meters using VDSL2 (Very high bitrate Digital Subscriber Line), according to Stefaan Vanhastel, director of product marketing at Alcatel-Lucent Wireline Networks. The test showed that it can also do 100Mbps over a distance of 1,000 meters, he said. Currently, copper is the most common broadband medium. About 65 percent of subscribers have a broadband connection that’s based on DSL, compared to 20 percent for cable and 12 percent for fiber, according to market research company Point Topic. Today, the average advertised DSL speeds for residential users vary between 9.2 Mbps and 1.9Mbps in various parts of the world, Point Topic said.’


Posted By: leo
Last Edit: 14 May 2010 @ 08:09



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