What are all these loop impairments (bridge taps, load coils, DLCs) that could disqualify my line from DSL?
Load coils: in-line inductances that improve voice-frequency transmission characteristics of a telephone circuit. Essentially, a “load” steals energy from high frequencies and gives it to lower frequencies. Typically only used in very long (> 9,000 ft) phone lines. By “bridges” I assume you mean “bridged taps”. In older neighborhoods, the phone wiring will have been used by more than one customer. Perhaps these customers lived at different (though near-by) addresses. The unconnected “spur” of wiring is a “bridged tab” on the currently connected circuit. DLCs, Digital Loop Carriers: there’s a bunch of systems for carrying more than one voice transmission on a single pair of wires. You can shift the frequencies up or down, or you can digitize the voice transmissions and divide the telephone circuit by time or code or something. The more general term is “pair gain”. These things cause different problems for high-frequency communications. Load coils will completely mess up things by filter
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