Analysis of the relevant knowledge about RJ45 connectors

The RJ45 connector is a kind of information socket (ie communication terminal) connector in the wiring system. The connector is composed of a plug (connector, crystal head) and a socket (module). RJ is the abbreviation of Registered Jack, which means "registered socket". In the FCC (Federal Communications Commission Standards and Regulations), RJ is an interface describing public telecommunication networks, and the RJ45 connector of a computer network is a common name for a standard 8-bit modular interface.

The RJ45 connector is composed of a plug and a socket. The connector composed of these two components is connected between the wires to realize the electrical continuity of the wires. The core of the RJ45 connector module is the modular jack. The gold-plated wire or socket hole can maintain a stable and reliable electrical connection with the modular socket shrapnel. Due to the friction between the shrapnel and the socket, the electrical contact is further strengthened as the plug is inserted.

The RJ45 connector jack body is designed with an integral locking mechanism so that when the modular plug is inserted, the interface between the plug and the jack can produce maximum pull strength. The wiring module on the RJ45 connector module is connected to the twisted pair through the "U"-shaped wiring groove, and the locking spring can fix the RJ45 connector module on the information outlet device such as the panel.

The RJ45 is composed of a plug and a socket. The connectors composed of these two components are connected between the wires to realize the electrical continuity of the wires.

The core of the RJ45 module is the modular jack. The gold-plated wire or socket hole can maintain a stable and reliable electrical connection with the modular socket shrapnel. Due to the friction between the shrapnel and the socket, the electrical contact is further strengthened as the plug is inserted. The main body of the jack is designed with an integral locking mechanism so that when the modular plug is inserted, the maximum pulling strength can be generated outside the interface of the plug and the jack. The wiring module on the RJ45 module is connected to the twisted pair through the "U"-shaped wiring slot, and the locking spring can fix the RJ45 module on the information outlet device such as the panel.

The RJ45 plug is also called RJ45 Modular Plug, which is used for the termination of data cables to realize the connection and modification of equipment and distribution frame modules. Good conduction performance is required for the RJ45 crystal plug; the three-prong** gold-plated thickness of the contact is 50μm, which meets the super 5 transmission standard and conforms to the T568A and T568B line sequence; it has the functions of preventing loosening, plugging, and self-locking. The RJ45 plug is a standard connector in copper cabling. It and the socket (RJ45 module) together form a complete connector unit. The connector composed of these two elements is connected between the wires to realize the electrical continuity of the wires. It is also an integral part of the finished jumper of integrated wiring technology. RJ45 plugs are usually connected to the two ends of the twisted-pair cable. In the standard integrated wiring design and installation, this accessory product is usually not listed separately, that is, it is not recommended that the user complete the connection between the twisted pair and the RJ45 plug.

The performance indicators of RJ45 also include attenuation, near-end crosstalk, insertion loss, return loss, and far-end crosstalk. Technical description of the performance of RJ45: contact resistance is 2.5mΩ, insulation resistance is 1000mΩ, dielectric strength is DC1000V (AC700V), there is no breakdown and arcing in one minute, the card connection** surface is gold-plated or silver-plated, and the wire diameter is available. It is 0.4mm～0.6mm, the number of plugs and sockets can be inserted and removed repeatedly at least 750 times, and the 8-wire contact pin is gold-plated 509 (inch).

Among these performance index requirements, crosstalk is an important factor considered in the design. In order to make the entire link have better transmission performance, crosstalk cancellation technology is often used in sockets. Crosstalk cancellation technology can produce the same amount of interference as the interference introduced from the plug. , Crosstalk signals of opposite polarity to cancel crosstalk. If the crosstalk interference introduced by the modular plug is represented by "++++", the opposite crosstalk generated by the socket is represented by "----". When the two crosstalk signals are equal in size and opposite in polarity, the total coupled crosstalk interference signal is zero.

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