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How to Make a Long Distance Relationship Work: DSL Availability and You Print E-mail


A secondary factor affecting DSL availability is a tiny device installed by some phone companies called a 'load coil.'

The copper wires carrying your phone service have a broad bandwidth - that is, they can handle a wide range of frequencies. The human voice is clearest from 300 to 3,400 Hz, so that's the portion of wire reserved for telephone calls.

When the telecomms decided to add DSL availability to the same copper wires, they opted to use frequencies in the 4,000 Hz and up range. This shouldn't have been a problem except that some companies had added load coils to the wire lines.
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