RJ45 performance indicators as well as attenuation, crosstalk, distal insertion loss, return loss and crosstalk. RJ45 performance technical note: contact resistance 2.5M ω, insulation resistance 1000m ω, dielectric strength DC1000V (AC700V), one minute no breakdown and arcing phenomena; Reed covered in gold or silver plated, connection path for 0.4mm~0.6mm; plug socket plug number does not less than 750; 8, contacts gold plated 509 (inch).

These performance requirements, crosstalk is an important factor to consider when the design, in order to make the whole link has a better transmission performance, crosstalk cancellation is often used in a socket, and crosstalk cancellation and interference from plugs into the same size, crosstalk signal of opposite polarity to cancel crosstalk. If crosstalk interference introduced by the modular plug "++++" said Sockets instead of crosstalk using "----". When two crosstalk signals equal in size, when the polar opposite, always coupled crosstalk interference signal of size zero.