TELECOM Digest OnLine - Sorted: Physically Protecting The Local Loop Metwork?

Physically Protecting The Local Loop Metwork?

hancock4@bbs.cpcn.com
17 Dec 2005 12:20:53 -0800

In reading about the Bell System interconnect debates of the 1960s and
1970s, one recognized concern* was that faulty customer-provided
equipment could screw up other subscribers by emitting high voltages
or crosstalk interference.

Today customers own all their equipment that is supposed to be
certified. But what happens if the customer alters the equipment or
it is defective? What happens if a high voltage is sent out
accidently over a telephone line (ie house current, either 110 or 220,
or ringing current meant for an extension telephone of a PBX)?

Further, is there any kind of high powered signal that could be sent
over a phone line that would result in crosstalk or service disruption
to the neighbors or other kinds of RF interference?

*These concerns were studied and confirmed by the FCC and technical
consultants. Other concerns were service responsibility -- would the
common carrier get blamed for problems by customer equipment, and
cream skimming -- would CPE hurt the principle in effect in those days
of universal telephone service and universal rate averaging by
eliminating cross-subsidy. As it turned out, competitors to the Bell
System did do cream-skimming, yet the Bell System was denied the
chance to adjust its rates (HI/LO) accordingly.

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