Phone/Modem Jack
Home A/V Connections Glossary
RJ-11 and RJ-14 phone/modem jacks
PC modems, DBS receivers, hard disk video recorders, and other kinds of A/V gear use these jacks for sending and receiving information via a telephone line. Usually computer modems feature a second phone jack — this allows you to plug in a telephone that will be operational whenever the modem is not in use.
RJ-11 jacks and connectors allow for the transmission of a single phone line; RJ-14 connections can carry two separate phone lines simultaneously. The connectors for one type will fit into the jacks of the other, but if you plug an RJ-14 cable into an RJ-11 jack, you'll lose the ability to access the second line from the computer and/or phone thus connected.
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