What is the difference between RJ9, RJ10, RJ11, RJ12, RJ14, RJ22, RJ25, RJ45, RJ48?

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What is the difference between RJ9, RJ10, RJ11, RJ12, RJ14, RJ22, RJ25, RJ45, RJ48?

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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, RJ22, RJ25, 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

Even if the type is the same, such as RJ12, they still have many different appearances and positions/contact based on different application scenarios, see the table below for details
 

What is the difference between RJ9, RJ10, RJ11, RJ12, RJ14, RJ22, RJ25, RJ45, RJ48?

Application	Image	Types	Features	Postion/Contact	Shielding	Interface shape	Cable application
Telephone		RJ12/RJ25	Half Shielding	6P/6C	Yes	Square	23~26AWG
		RJ12/RJ25	Two Screw Hole	6P/6C	No	Square	23~26AWG
		RJ12/RJ25	Lengthened	6P/6C	No	Round	23~26AWG
		RJ25	Lengthened	6P/4C (2-3-4-5)	No	Square	23~26AWG
		RJ12/RJ25	Lengthened	6P/6C	No	Round	23~26AWG
		RJ25	Short	8P/2C (4-5)	No	Square	23~26AWG
		RJ12/RJ25	Locking bolt to the right	6P/6C	No	Square	23~26AWG
		RJ25	Locking bolt to the right	6P/4C (1-2-5-6)	No	Square	23~26AWG
		RJ25	Locking bolt to the right	6P/2C (3-4)	No	Square	23~26AWG
		RJ25	Locking bolt to the right	6P/2C (5-6)	No	Square	23~26AWG
		RJ25	Locking bolt to the left	6P/2C (3-4)	No	Square	23~26AWG
		RJ25	Locking bolt to the left	6P/2C (1-6)	No	Square	23~26AWG
		RJ25	Short	6P/6C	No	Square	23~26AWG
		RJ12/RJ14	Short	6P/4C (2-3-4-5)	No	Square	23~26AWG
		RJ11	Short	6P/2C (3-4)	No	Square	23~26AWG
		RJ9	/	4P/4C	No	Round	23~26AWG
		RJ9	/	4P/4C	No	Square	23~26AWG
		RJ9	/	4P/2C	No	Square	23~26AWG
	What you need to know about RJ9/RJ10/RJ22? ● RJ9 is actually at times denoted as the RJ10 or RJ22. so RJ9=RJ10=RJ22 ● RJ9/RJ10/RJ22 have 4 Positions, 2 or 4 Contacts ● RJ9/RJ10/RJ22 are typically terminated on 4 conductor curly phone cable and used to connect a telephone handset to a telephone receiver, they have a unique configuration type ● Since telephone handsets/headsets do not connect directly to the public network, they do not have a specific registered jack code. ● Please Note RJ9 is not an official plug What you need to know about RJ11? ● RJ11, RJ12, RJ14 and RJ25 are the same series, with the same size 9.5mm wide, but the number of contacts is different ● RJ11 has two configuration types, 6 Positons, 2 or 4 Contacts, Commonly used is 6P2C ● Registered Jack 11 is a telephone interface that uses a cable of twisted wire pairs and a modular jack with 2 or 4 contacts ●  RJ11 uses a standard 6P2C connector for a standard telephone connector. It only uses a 6P4C connector when low voltage power is required to send to the indicator lamp of the telephone ● RJ11 is most commonly used for telephone and modem connections, plugging a telephone into the wall and the handset into the telephone ● Used in ADSL, Modems, Telephones, Establishing bridged connection in telephone lines ● RJ11 is an analog telephone connection, Bandwidth up to 24 Mbps can be supported What you need to know about RJ12/RJ25? ● RJ12/RJ25 utilizes all six slots, so it must be 6P6C ● RJ12/RJ25 enjoins a central telephone system with single telephone lines through a line circuit ● RJ12/RJ25 is used for centralized telephone networks in office ● RJ12/RJ25 requires specialized 6-flat ribbon standard cables; it contains six thin color coded copper wires, these colors are white, black, red, green, yellow and blue ● In practical applications, there are some special customized RJ12/RJ25, which may be 6P4C or 6P2C What you need to know about RJ14? ● RJ14 connector has 6 positions in which 4 are installed,6P4C,The pins are 2-3-4-5 ● When RJ11 is 6P4C, it`s same with RJ14, but RJ14 has no 6P2C ● RJ14 has 4 wires and used for connector to two analog telephone lines. ● RJ14 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.
Application	Image	Types	Features	Postion/Contact	Shielding	Interface shape	Cable application
Ethernet		RJ45	CAT5 For Printer	8P/8C	No	Round	23~26AWG
		RJ45	CAT5 For Industry	8P/8C	Yes	Round	23~26AWG
		RJ48	CAT5E	8P/8C	Yes	Round	23~26AWG
		RJ45	Vector Converter Adapter	8P/8C	No	/	/
		RJ45	CAT5E CAT6	8P/8C	Yes	Round	23~26AWG
		RJ45	CAT5E CAT6	8P/8C	Yes	Round	23~26AWG
		RJ45	CAT5E CAT6 CAT6E	8P/8C	No	Round	23~26AWG
		RJ45	CAT5E	8P/4C	No	Round	23~26AWG
		RJ45	CAT5E	8P/2C	No	Round	23~26AWG
		RJ45	CAT5E CAT6 CAT6E Short	8P/8C	No	Round	23~26AWG
		RJ45	CAT5E	8P/8C	No	Round	23~26AWG
		RJ45	CAT7	8P/8C	Yes	Round	ID: 1.2mm
		RJ45	CAT5E CAT6 CAT6E Assembly type	8P/8C	No	Square	23~26AWG
		RJ45	CAT6E CAT7	8P/8C	Yes	Round	ID:1.3mm
		RJ45	CAT6E CAT7	8P/8C	Yes	Round	OD: 6.4-9.0mm
		RJ45	CAT7	8P/8C	Yes	Round	OD: 6.5mm Max
		RJ45	CAT6E	8P/8C	No	Round	OD: 6.0mm Max
		RJ45	CAT6E	8P/8C	Yes	Round	OD: 8.0mm Max
	What you need to know about RJ45? ● RJ45 is a telco data connection that has been obsolete for many years ● 8 positian,8 Contacts ● RJ45 are used in networking, where one connects computers or other network elements to each other ● RJ45 is typically used in Network wiring such as CAT5E/CAT6 ● RJ45 connectors are slightly bigger than RJ11, RJ12, RJ14, and RJ25 ● Its Bandwidth up to 10Gsbps over Ethernet can be supported ● RJ45 can be wired into two different ways: TS68A and T568B, which are used to terminate the twisted pair cable onto the connector interface What you need to know about RJ48? ● Registered Jack 48 is a data communications interface that uses a cable of twisted wire pairs and an 8-pin modular jack ● RJ48 uses the same plug and socket as RJ45, 8 positian,8 Contacts, but RJ48 has different Pinouts ● It uses the same plug and socket as RJ45 but has different Pinouts ● RJ48 is used for connecting T1, EI and J1 lines ● RJ48C is commonly used for T1 lines and uses pins 1, 2, 4 and 5 ● R148X 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 ● Used in communication wiring and data environments

 

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