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Note: This section is out of date and no longer maintained.
It is retained for the value of any residual information contained in it.

shielded

Anyone who has heard a car radio give off a loud ticking sound as another car passes by has seen how unshielded equipment or older equipment can both produce or be affected by radio waves. Twisted pair phone system wires are totally open to any interference from the environment they pass over or near.. for example, ceiling lights, thermostats, generators etc can all introduce noise on the line. Even regular household electricity has a 50hz hum that can find its way into the phone system by badly designed equipment or badly placed cables.


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