
In the old days, a POTS (plain old telephone service) telephone, also sometimes called an “analog phone”, got its dial tone from a pair of copper wires that led to a telephone company central office. The distance between the telephone and the central office might be miles. The telephone company might have sophisticated equipment in the central office that can test for faults on the telephone line, such as spurious voltages or shorted connections.
Nowadays if the customer is trendy, modern, and up-to-date, the POTS telephone will get its dial tone from an ATA (analog telephone adapter). At above right we see a functional blog diagram including an ATA. It turns out that some ATAs have sophisticated circuitry, like that in a legacy telephone company central office, that can test for faults on the telephone line, such as spurious voltages or shorted connections. Continue reading “Some VOIP analog telephone adapters are very feature-rich”