Registered jack45 is called RJ45, also known as the net connector, which is one of the many network connectors.
The RJ45 is made up of plugs and sockets. The connectors of these two components are connected to wires to achieve electrical continuity. The crystal head is loaded into the RJ45 socket, and the metal parts are contacted. The shrapnel on the crystal head ensures a stable and reliable electrical connection between them. Because of the friction between the shrapnel and the socket, electrical contact is further strengthened with the insertion of the plug. The main design of the jack adopts the whole locking mechanism, so when the crystal head is inserted, the maximum pulling strength can be produced outside the interface of the plug and socket.
According to the installation position of RJ45 module, it is divided into four standards, which are plate type, board type, plate type and general type. It is made up of plastic colloids and terminals, and some of them have metal shells, which play a shielding role. The plastic body has the characteristics of high pressure and flame retardancy, and can be installed on the standard panel at 90 degree (vertical) or 45 degree angle. Special process design can provide at least 750 repeated insertions.
The performance indicators of RJ45 include attenuation, near end crosstalk, insertion loss, echo loss and remote crosstalk, etc. The performances of RJ45 are as follows: contact resistance is 2.5m ohm, insulation resistance is 1000m ohm, and the electrical resistance is DC1000V (AC700V). There is no breakdown and arcing phenomenon in one minute. Plug and socket can be repeatedly inserted and pulled out no less than 750 times.
In these performance indicators, crosstalk is one of the important factors considered during the design, in order to make the whole line transmission performance is better in the socket, crosstalk cancellation technology is often used to generate interference, crosstalk cancellation technology and introduced from the plug of the same size and polarity of the crosstalk signal opposite to offset crosstalk. If the crosstalk interference by the modular plug into the socket said, "which produced the opposite crosstalk by" -- "said. When the size of the two crosstalk signals is equal and the polarity is opposite, the size of the total coupling crosstalk interference signal is zero.