Difference Between RJ11 and RJ12 (With Table)

RJ11 vs RJ12

The telephone was one of the prime innovations that mankind experienced in the 20th century. This revolutionary device made possible two-way communication at lightning speed. However, early telephones were connected with telephone lines by tapes. These connections were bungling and often break easily.

The innovation of registered jack brought a solution to this problem. A connection with registered jack was sturdy and all telecommunication companies accepted its standard format. Rj11 and Rj12 are very common jacks often used in most telecommunication systems. From the appearance, both of them look the same. For this reason, many people fail to distinguish the difference between them.

The difference between Rj11 and Rj12 is that Rj11 is a connection jack that creates a bridged connection for single telephone line which uses flat stain cable for household wire telephone and modem connections, while Rj12 is a connection jack that enjoins central telephone system with single telephone lines through a line circuit which uses specialized RJ12 6-flat ribbon standard cables for centralized telephone network in offices.


 

Comparison Table Between RJ11 and RJ12 (in Tabular Form)

Parameter of ComparisonRj11Rj12
What is itA connection jack that creates a bridged connection for a single telephone lineA connection jack that enjoins a central telephone system with single telephone lines through a line circuit.
Full formRegistered jack 11Registered jack 12
Connector6P2C & 6P4C6P6C
CableFlat stain cableSpecialized RJ12 6-flat ribbon standard cables
Used inHousehold wire telephone and modem connectionsOffices for centralized telephone network

 

What is RJ11?

The full form of Rj11 is registered jack 11. It is a connection jack that creates a bridged connection for a single telephone line. The Rj11 connection jack is an analogue system. This connection jack transmits low voltage electrical signals through it. Rj11 is used for two way connection. It can both transmit and receive low voltage electrical signals through it.

This jack uses a 6P2C connector. It has six slots for wearing connections. However, all the slots of this jack are not used for wiring. Most of the time only two slots in the middle are used to bridge connection. However, four slots 6P4C are used when low voltage power is sent to the indicator lamp of the telephone.

The Rj11 jack was designed in the 70’s era to revolutionize the telecommunication system. It is a male part of the connection system. The jack required to fit the Rj11 compatible female section to establish the connection. This jack made to a connection between two lines easy. Not all cables are designed to fit with the Rj11 connector jack. Only flat stain cable with 2-4 copper wire can attach with Rj11 connector, and a crimper tool is required to make the connection permanent.

The Rj11 jack was accepted by all telecommunication companies around the world. The jack was able to standardize the telecommunication connector system for the world. Even in this digital age, all wired telephones and dial-up modems use this connector.

RJ11
 

What is RJ12?

The full form of Rj12 is registered jack 12. It is a connection jack that enjoins a central telephone system with single telephone lines through a line circuit. It is a male plug and only connects with Rj12 female jack to establish the connection.

The Rj12 uses a 6P6C connector. It has six slots for connection wearing and all six slots are used for the communication. Specialized RJ12 6-flat ribbon standard cables are used for Rj12 connectors. This cable contains six thin copper cables and transmits & receives electrical signals through it.

In This ribbon standard cable, all six copper wires are colour coded. These colours are white, black, red, green, yellow, and blue. Unlike other wearing systems, the Rj12 is completely different and complex. The cable technician has to set the copper wearing system in the correct order to make it functional.

The Rj12 connector went popular in the 80’s era when various corporate offices required a centralized telephone network for private use. This connector can easily set up a local area network in the office with telephones. Even in this digital age, many offices use this connector to set up their intercom system.

RJ12 1

Main Differences Between RJ11 and RJ12

  • Rj11 is a connection jack that creates a bridged connection for a single telephone line, while Rj12 is a connection jack that enjoins a central telephone system with single telephone lines through a line circuit.
  • The full form of Rj11 is registered jack 11. On the other hand, the full form of Rj12 is registered jack 12.
  • Generally, Rj11 uses a standard 6P2C connector for a standard telephone connection. It only uses a 6P4C connector when low voltage power is required to send to the indicator lamp of the telephone. But Rj12 jack always uses a 6P6C connector.
  • The Rj11 jack uses flat stain cable, which contains two thin copper wires. However, Rj12 jack requires specialized RJ12 6-flat ribbon standard cables; it contains six thin colour coded copper wires.
  • Rj11 jack is used in regular household wire telephone and modem connections. But Rj12 jack is only used for centralized telephone networks in offices.

 

Conclusion

The invention registered jack was truly a revolutionizing event. This jack brought standardization in the telecommunication industry. Before the arrival of registered jack, parts of every telephone company was different from others. The registered jack established one standard for all telephone companies.

The simplistic design of Rj11 was truly brilliant. It was easily plug-in with all telephone sockets. It was also a very sturdy design for regular household telephones and modems. It uses a normal flat stain cable for connection. This cable contains two thin copper wires for two way analogue communication.

However, the design of Rj12 is very complicated. For this jack, specialized RJ12 6-flat ribbon standard cables are required. This cable comes with six colour coded copper wire and the technician needs to put all colour coded wire in the correct order for proper attachment. Normally this jack is not used in regular houses. Instead, it is used in most offices for a centralized telephonic communication system.


 

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Difference Between Rj11 and Rj12