RJ45 performance indicators and methods of differentiation
The RJ45's performance specifications also include attenuation, near-end crosstalk, insertion loss, return loss, and far-end crosstalk. RJ45 performance and technical description: contact resistance is 2.5mΩ, insulation resistance is 1000mΩ, DC1000V (AC700V), no breakdown and arcing in one minute; the card spring is gold-plated or silver-plated, and can be wire It is 0.4mm to 0.6mm; the number of plugs and sockets that can be plugged repeatedly is not less than 750 times; and the 8-wire contact pin is gilded to 509 (inch).
In these performance requirements, crosstalk is an important factor in designing. In order to make the whole link have better transmission performance, crosstalk cancellation technology is often used in the socket. The crosstalk cancellation technology can generate the same size as the interference introduced from the plug. Cross-talk signals with opposite polarity to cancel crosstalk. If the crosstalk interference introduced by the modular plug is represented by "++++", the opposite crosstalk generated by the outlet is represented by "----". When the two crosstalk signals are equal in magnitude and opposite in polarity, the total coupled crosstalk interference signal has a magnitude of zero.
There will also be an RJ11 interface on the home ADSL Modem (Modem), which is slightly smaller than the RJ45 interface and is mainly used to connect telephone lines. It should be noted that, RJ11 interface is 4 or 6-pin, and RJ45 is 8-pin interface, so RJ45 plug can not be inserted into RJ11 interface, while RJ11 plug can not be inserted into RJ45 interface (although it can be achieved on the physical interface), It must be clearly distinguished in actual use.