What Is R-J11 (Registered Jack 11)? – POFTUT

What Is R-J11 (Registered Jack 11)?

Registered Jack 11 or simply R-J11 is a connection interface or connector used to plug cables with the wall outlet. In general, RJ-11 is also named as modem port, phone connector, phone jack or phone line in a nontechnical way.

RJ-11 Wiring 2 or 4 Pins

There are male and female RJ-11. RJ-11  has 6 connector positions but in general 2 or 4 of them are used in practice. Generally untwisted and unshielded twisted pair (UTP) cables are used to end with RJ-11 connector. We can see below that RJ-11 is implemented as 4 connecting cables with 4 pins.

RJ-11 4 Pins In Use
RJ-11 4 Pins In Use

In the following example, only two pins are used and other pinholes are not used for a cable connection.

RJ-11 2 Pins In Use
RJ-11 2 Pins In Use

6 pins can be used in rate situations for telephones. 6 pins RJ-11 can be used to connect 3 phones to the telephone line.

RJ-11 6 Pins in Use
RJ-11 6 Pins in Use

RJ-11 Types

There are two types where C type is used for desktop phone jack with the name RJ-11C and W type which is used for wall-mounted jack with the name RJ-11W.

RJ-11 Use Cases

RJ-11 is a popular connector type like RJ-45 where it can be used for different cases. Here are some of them.

  • `Phone` is the most popular use case for RJ-11. Phones are connected to the wall outlets with RJ-11 connectors.
  • `Modem` is another use case which is related to the phone. Modems are using the phone line where it uses RJ-11 connectors. In the old days, computers and the notebooks have RJ-11 for a modem connection.

RJ-11 vs RJ-45

RJ-45 is another popular connector type. Generally, RJ-11 and RJ-45 are compared with each other. In this part, we will compare both connector types with each other.

  • The RJ-11is used for telephone lines where RJ-45 is used for computer network
  • The RJ-11 has 4 wires in general and 6 wires at max where RJ-45 has 8 wires
  • The RJ-11 connector is smaller then RJ-45 connectors
  • The RJ-11 connector can be plugged into a RJ-45 slot but it will not work and may damage the devices
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RJ-11 vs RJ-12

Well, actually RJ-11 and RJ-12 are very same connectors where only the cable and pin count is different. RJ-12 uses 6Pin 6 Cable which means all 6  pins are used by the 6 cables. Both RJ-11 and RJ-12 are used for telephone lines.

  • RJ-11 has the same six-slot connector and size as the RJ-12
  • RJ-11 differs from RJ-12 in cabling where RJ-11 has 4 cables but RJ-12 has 6 cables
  • Both RJ-11 and RJ-12 used in the same cases as phone
  • RJ-11 is commonly used in homes and offices where RJ-12 is very low usage which is in large companies

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