Some Knowledge about RJ45 Connector

The RJ45 connector is a type of information socket (i.e., communication outlet) connector in a wiring system. The connector consists of a plug (a connector and a crystal head) and a socket (module). RJ is the abbreviation for Registered Jack. In the FCC(standards and regulations of Federal Communications Commission), RJ describes the interface of public telecommunications networks, and the RJ45 connector for computer networks is the common name for the 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 achieve the electrical continuity of wires. The modular jack is the core of the RJ45 connector. Gold-plated wires or socket holes can maintain a stable and reliable electrical connection with the modular socket leaf spring. The electrical contact will be further enhanced with the insertion of the plug due to the friction between the leaf spring and the jack.

The main body of the RJ45 connector jack is designed with an integral locking mechanism so that when the modular plug is inserted, the interface outside the plug and socket can generate the maximum pulling strength. The connection module on the RJ45 connector module connects the twisted-pair wires through a U-shaped wiring slot, and the locking leaf spring allows the RJ45 connector module to be fixed on an information outlet such as the faceplate.

The RJ45 connector consists of a plug and socket, and the connector composed of these two components is connected between the wires to achieve the electrical continuity of wires.

The modular jack is the core of the RJ45 connector. Gold-plated wires or socket holes can maintain a stable and reliable electrical connection with the modular socket leaf spring. The electrical contact will be further enhanced with the insertion of the plug due to the friction between the leaf spring and the jack.The main body of the RJ45 connector jack is designed with an integral locking mechanism so that when the modular plug is inserted, the interface outside the plug and socket can generate the maximum pulling strength. The connection module on the RJ45 connector module connects the twisted-pair wires through a U-shaped wiring slot, and the locking leaf spring allows the RJ45 connector module to be fixed on an information outlet such as the faceplate.

The RJ45 plug, also known as RJ45 modular plug, is used for the terminal connection of data cables, which can help to realize and change the connection between the equipment and distribution frame modules. Good conductivity is required for RJ45 modular plug; the gold-plated thickness of the contact triadius reed is 50μm, which meets the Cat5e transmission standards and conforms to the wire sequences of T568A and T568B; it has the functions of preventing looseness, insertion and extraction, self-locking, etc. The RJ45 plug is the standard connector in copper wiring, which constitutes a complete connector unit together with the socket (RJ45 module). The connector composed of these two components is connected between the wires to achieve the electrical continuity of wires. It is also a constituent part of the finished jumper in the comprehensive wiring technology. The RJ45 modular plug is usually connected to the ends of the paired cable. This accessory product is usually not listed separately in the specification of the integrated wiring design and installation, that is, users are not encouraged to connect the twisted pair to the RJ45 plug by themselves.

The performance indexes of RJ45 also include attenuation, near-end cross-talk, insertion loss, return loss, and far-end cross-talk, etc. The technical description of RJ45 performance: When the contact resistance is 2.5mΩ, the insulation resistance is 1000mΩ, and the dielectric strength is DC1000V (AC700V), there will be no breakdown and flashover phenomena in one minutes, gold or silver can be plated on the connection reed surface, the connection diameter is from 0.4mm to 0.6mm, the repeated insertion and extraction frequency of the plug and socket is not less than 750 times, and the 8 line contact pin can be plated with gold 509 (inch).

The crosstalk is an important factor to be considered in the design among these performance requirements. In order to obtain a better transmission performance in the entire link, the vectoring technology is often used in sockets to offset the crosstalk by producing a crosstalk signal of the same magnitude and the opposite polarity as that introduced from the plug. If the crosstalk introduced by a modular plug is represented by "++++", the opposite crosstalk produced by the socket is represented by "----". When the magnitude of two crosstalk signals is equal and the polarity is opposite, the total coupled crosstalk interference signal is zero.