Difference Between RJ9, RJ10, RJ11, RJ12, RJ14, RJ25, RJ45 & RJ48

A registered jack (RJ) is a standardized telecommunication network interface for connecting voice and data equipment to a service provided by a local exchange carrier or long distance carrier. Accordingly, registered jacks are primarily named by the letters RJ, followed by two digits that express the type.

RJ9, RJ10, RJ11, RJ12, RJ14, RJ45 & RJ48 are all crimp connectors with gold pins used for telecoms, networking and occasionally low voltage lighting control applications. The difference is in the number of positions available on the connector and the number of contacts actually present. Obviously where there are more positions the connector is necessarily larger. Although these standards are legal definitions in the United States, some interfaces are used worldwide.

RJ9/RJ10/RJ22

RJ9 connector is a 4 position, 4 conductor plug. It’s typically terminated on 4 conductor curly phone cable and used to connect a telephone handset to a telephone receiver. The RJ 9 is not a connector you will come across every now and then. It is actually at times denoted as the RJ10 or RJ22 and it also has a unique configuration type.

What You Need To Know About RJ9

• The RJ 9 is not a connector you will come across every now and then. It is actually at times denoted as the RJ10 or RJ22 and it also has a unique configuration type.
• 4 Positions, 4 conductors.
• Mostly used as telephone handset cables.
• Since telephone handsets/headsets do not connect directly to the public network, they do not have a specific registered jack code.
• Please Note RJ 9 is not an official plug.

RJ11

Registered Jack -11 is a telephone interface that uses a cable of twisted wire pairs and a modular jack with two, four or six contacts. RJ-11 is the common connector for plugging a telephone into the wall and the handset into the telephone.  RJ11 cables can hold six wires for up to three telephone lines and their nomenclature is technically RJ11, RJ14 or RJ25 depending on the number of lines.

What You Need To Know About RJ11

• The RJ 11 is most commonly used for telephone and modem connections and it has two configuration types.
• 6 Positions, 4 conductors.
• Used in ADSL, Modems, Telephones, Establishing bridged connection in telephone lines.
• RJ11 is an analog telephone connection.
• RJ 11 uses only four of the six slots available.
• Bandwidth upto 24 Mbps can be supported.
• RJ11 connects 4 wires.
• RJ11 is compact and square shaped.

RJ12

RJ 12 is a connection jack that enjoins a central telephone system with single telephone lines through a line circuit. RJ12 uses a 6P6C connector. It has six slots for connection and all the six slots are used for communication. Specialized RJ12 6-flat ribbon standard cables are used for RJ12 connectors. This cable contains six thin copper cables and transmits and receives electrical signals through it. In this ribbon standard cable, all six copper wires are color coded. These colors are white, black, red, green, yellow and blue.

What You Need To Know About RJ12

• RJ 12 is a connection jack that enjoins a central telephone system with single telephone lines through a line circuit.
• 6 position, 6 conductors
• Used in phone systems.
• RJ12 utilizes all six slots.
• RJ12 is used for centralized telephone networks in office.
• RJ12 requires specialized RJ12 6-flat ribbon standard cables; it contains six thin color coded copper wires.

RJ14

RJ14 connector has 6 positions in which 4 are installed. The pins are 2, 3, 4 and 5. It is used for connection to two analog telephone lines. It uses 4 wires for connection. It is used to connect two telephones. It uses 6P4C connector type.

What You Need To Know About RJ14

• RJ14 uses a six-position four-conductor (6P2C) modular jack.
• RJ 14 look exactly the same as RJ11, except that the RJ14 has two more thin copper strips, housed in grooves underneath the plug, than the RJ11.
• Commonly used for two-line service.
• RJ14 is often used when you have multiple lines leading to a single phone unit.
• It is also common to have an RJ14 connection that goes through a junction box and is then split into two RJ connections that lead to two separate telephone units.
• For an RJ14 wiring, you can use all the connectors aside from 6P2C as it lacks the necessary contact points.
• If you will be installing telephone systems that use both RJ11 and RJ14 connections, it better to get 6P4C connectors and cables that have two twisted pairs.

RJ45

RJ45 is a type of connector commonly used for Ethernet networking. It looks similar to a telephone jack, but is slightly wider. Since Ethernet cables have an RJ45 connector on each end, Ethernet cables are sometimes referred to as RJ45 cables. The ‘’45’’ simply refers to the number of the interface standard. Each RJ45 connector has eight pins, which means an RJ45 cable contains eight separate wires. If you look closely at the end of an Ethernet cable, you can actually see the eight wires of different colors. Four of the wires are solid colors whereas the other four are stripped. This connector most commonly connects to the end of CAT5 cable, which connects between a computer network card and a network device such as a network router. RJ45 cables can be wired into two different ways. One version is called T-568A and the other is T-568B.  

What You Need To Know About RJ45

• RJ is a telco data connection that has been obsolete for many years.
• 8 position, 8 conductors.
• RJ45 are used in networking, where one connects computers or other network elements to each other.
• They are typically used in Network wiring such as CAT5e/CAT6.
• RJ45 connectors are slightly bigger than RJ11’s.
• Mostly used with Ethernet cables.
• You cannot plug-in RJ45 connector into an RJ11 interface/port/slot, however you can do the opposite (you should avoid doing so as it can damage the RJ45 port).
• Bandwidth of upto 10Gbps over Ethernet can be supported.  
• RJ 45 connects 8 wires.
• RJ45 is longer and more rectangular.
• It can be wired into two different ways: T568A and T568B which are used to terminate the twisted pair cable onto the connector interface.

RJ48

Registered Jack 48 is a data communications interface that uses a cable of twisted wire pairs and an 8-pin modular jack. It uses the same plug and socket as RJ45 but has different Pinouts. RJ48C is commonly used for T1 lines and uses pins 1, 2, 4 and 5. RJ48X is a variation that contains shorting blocks in the jack so that a loopback is created for troubleshooting when unplugged. RJ48S uses pins 1, 2, 7 and 8 and is commonly used for 56 kbps digital lines.

What You Need To Know About RJ48

• It is an 8P8C (8 position, 8 conductors) connector type.
• It is used for connecting T1, E1 and J1 lines.
• Used in communication wiring and data environments.

RJ61

RJ61 is a physical interface often used for terminating twisted pair cables. It uses an eight position, eight conductor (8P8C) modular connector. This pinout is for multi-line telephone use only; RJ61 is unsuitable for use with high-speed data, because the pins for pairs 3 and 4 are too widely spaced for high signaling frequencies.

The flat eight-conductor silver-satin cable traditionally used with four-line analog telephones and RJ61 jacks is also unsuitable for use with high-speed data.  Twisted pair cabling is required for data applications. Twisted –pair data patch cable used with the three data standards is not a direct replacement for RJ61 cable, because RJ61 pairs 3 and 4 would be split among different patch cable twisted pairs, causing cross-talk between voice lines 3 and 4 that might be noticeable for long patch cables.

Difference Between R11 And RJ45

Difference Between R11 And RJ 12

Difference Between RJ 11 And RJ 14