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RJ-11 is simply a standard conventional telephone jack, and RJ is short for "registered jack." If you find two RJ-11 connectors on the back of a computer, it means the computer has a dial-up modem. One of the connectors connects to a telephone wall jack. The other connector can be attached to a telephone. Most modems were made to where if the modem is in active use, any phone plugged into the modem would be disconnected so as to not interfere with the modem.

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Q: Two rj-11 connectors identify what in a computer?
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