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RJ11 For Modems And Telephony

PC Interfaces 101
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RJ11 connection cable

The RJ45 network connector and the RJ11 look superficially alike, but the RJ11 has only four leads (or contacts) whereas the RJ45 has eight. In computer systems, the RJ11 is used primarily for connecting to modems. There are many different adapters for RJ11 connectors, because telephone ports vary widely from country to country.

RJ11 ports on a notebook PC

RJ11 modem connector

RJ11 adapters convert between regional telecomm variations, this one works for Germany. In the long term country-specific versions are on the wane.
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