Performance indicators:

The performance indicators of RJ45 also include attenuation, near end crosstalk, insertion loss, return loss, and far end crosstalk. Performance and technical specifications of RJ45: When the contact resistance is 2.5m Ω, the insulation resistance is 1000m Ω, and the electrical strength is DC1000V (AC700V), there is no breakdown or arcing phenomenon for one minute; The surface of the clamp spring is gold-plated or silver plated, and the wire diameter can be 0.4mm to 0.6mm; The plug and socket can be repeatedly plugged and unplugged no less than 750 times; 8-wire contact pin gold-plated 509 inches.

Difference method:

Among these performance indicators, crosstalk is an important factor considered in design. In order to improve the transmission performance of the entire link, crosstalk cancellation technology is often used in sockets. Crosstalk cancellation technology can generate crosstalk signals of the same magnitude and opposite polarity as the interference introduced from the plug to cancel crosstalk. If the crosstalk interference introduced by modular plugs is represented by "++++", the opposite crosstalk generated by sockets is represented by "----". When the magnitude of two crosstalk signals is equal and the polarity is opposite, the total size of the coupled crosstalk interference signal is zero.

On household ADSL modems, there is also an RJ11 interface, which is slightly smaller than the RJ45 interface and is mainly used to connect telephone lines. It should be noted that the RJ11 interface is a 4 or 6-pin interface, while the RJ45 interface is an 8-pin interface, so the RJ45 plug cannot be inserted into the RJ11 interface. Conversely, the RJ11 plug cannot be inserted into the RJ45 interface (although it can be physically implemented), and it must be distinguished clearly in practical use.

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