1. The twisted copper pair
To fully understand the principle behind DSL (Digital Subscriber Line) technologies, it's essential to know the main properties and constraints of its transmission medium: the twisted copper pair.
1.1 History
The twisted copper pair (TP, Twisted Pair) was invented in 1881 by Alexander Graham Bell, just a few years after he patented the telephone principle. Twisting the copper wires makes the pair less susceptible to electromagnetic coupling with external disturbances, and also reduces outward electromagnetic radiation....
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The twisted copper pair
Access networks based on twisted copper pairs
References
- (1) - DSL Forum Press Release - DSL Global Surges past the 150 million subscriber mark - . June 23 th 2006. (disponible sur http://www.dslforum.org/ )
- (2)...
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