The name RJ stands for Registered Jack, which is a standardized network interface. RJ45 and RJ11 are two common crystal connectors in our lives. Their structure and application range are different and cannot be mixed, but many people do not understand this, which causes some unnecessary equipment damage.
This article will introduce these two kinds of crystal connectors in detail.
What is RJ45 crystal head
RJ45 crystal head is a connector with 8 pins, mainly used in Ethernet, "RJ" means the registered jack, "45" represents the serial number of the interface standard. The RJ45 crystal head is usually terminated on an Ethernet line and used to connect various network devices, such as computers, routers, switches, etc.
Network cable production process
What is RJ11 crystal head?
The RJ11 crystal head is very similar to the RJ45 crystal head, but only has 4 pins and is commonly used to connect phones and modems. It should be noted that RJ11 usually refers to a 6-position (6-pin) modular jack or plug, but only 4-pin is used. In addition, RJ11 is also used in the 4-pin version of the modular connector.
6P4C 4-pin telephone line crystal head
The difference between RJ45 crystal head and RJ11 crystal head is mainly manifested in the following aspects:
structure
The RJ45 crystal head is a connector with 8 grooves and 8 contacts (8p8c), while the RJ11 crystal head usually only has 6 grooves and 4 contacts (6p4c). Therefore, the RJ45 crystal head is larger than the RJ11 crystal big head. The RJ11 crystal head can usually be inserted into the RJ45 interface, but not vice versa, but it is strongly recommended not to use the RJ11 crystal head for the RJ45 interface.
Line order standard
Due to the different structure of the RJ45 crystal head and RJ11 crystal head, the wire sequence standards when wiring are also different. The RJ11 crystal head generally only has 6 grooves and 4 contacts (6p4c), and its wire sequence is fixed, as shown in the following figure:
There are two wire sequence standards for RJ45 crystal head wiring: T-568A and T-568B (specific details are as follows). By adopting different standards, the resulting network cable has two types: straight-through and crossover. If you want to make a straight-through cable, the two ends of the cable should be wired according to the same standard (T-568A or T-568B). If you want to make a cross-over cable, the two ends of the cable should be wired with different standards.
T-568A standard
1. White/green (close +)
2. Green (collect -)
3. White/orange (hair +)
4. Blue
5. White/Blue
6. Orange (fat-)
7. White/Brown
8. Brown
T-568B standard
1. White/orange (hair +)
2. Orange (fat-)
3. White/green (close +)
4. Blue
5. White/Blue
6. Green (collect -)
7. White/Brown
8. Brown
application
The RJ45 crystal head is generally terminated at both ends of the network cable and is used to connect network devices such as computers, while the RJ11 crystal head is terminated at both ends of the ADSL and voice cables and is used to connect telephones or modems. Although the RJ11 crystal head can be inserted into the RJ45 interface, the two cannot work together, because the RJ11 crystal head is not an international standard, and its size, insertion strength, insertion angle, etc. are not unified according to international standard connector design requirements If it is forced to be used together, the RJ45 interface of the device may be damaged.
to sum up
RJ45 crystal head and RJ11 crystal head are different in size, wiring standard and application range. The two are not interoperable, and special attention should be paid when using.
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