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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. Winding therefore has the effect of significantly reducing...
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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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