The twisted copper pair
DSL: the physical medium and modulation techniques
Archive REF: TE7598 V1
The twisted copper pair
DSL: the physical medium and modulation techniques

Authors : François DUTHILLEUL, Paul SPRUYT

Publication date: November 10, 2006 | Lire en français

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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...

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