RJ45 connector commonly known as crystal head. Is connected to the network card or HUB that transparent plug, is used to connect the ends of the twisted pair. RJ-45 is a network interface specification, similar to the RJ-11 interface, that is, we usually use the "telephone interface", used to connect the telephone line. It is called "crystal head", because it looks bright and translucent reasons. The RJ-45 plug must be installed at both ends of the twisted pair cable for network communication on the RJ-45 interface of the NIC, hub, or switch.

At present, the RJ45 connector on the market a lot of brands and types, but if the use of industry is the industry's customers, need RJ45 connector with excellent sealing waterproof performance and to ensure that the signal does not decline, this RJ45 connector market is still relatively small The Which the British art Lai Chong BULGIN brand, more ideal. RJ45 crystal head are conventional 8 terminals, generally have gold-plated, which can be changed according to the requirements of those who demand. In general, the greater the number of u (mai) gold plating, the stronger the transmission capacity of the electrical signal. General crystal head to meet the quality of the standard is the number of mating 2000 times, if less than the number of plug, then the crystal head as a defective product.

RJ45 connector twisted pair cable there are two: one is widely used direct connection, the other is the special case of the use of cross-line, if the pc connection switch or other network interface, or other connections between the two sides Status is not equal to the case of the use of direct connection, and if the connection of the two devices are equal, for example, are two pc machines, notebooks, etc., we must use the cross-line, the difference between the two is inconsistent , The interface is the same.

Cross-line approach is:

One with 568A standard, 568A standard practice: green and white -1, green -2, orange white -3, blue -4, blue and white -5, orange -6, brown white -7,

One with 568B standard, 568B standard practice: orange white -1, orange -2, green white -3, blue -4, blue and white -5, green -6, brown white -7, brown -8

Parallel line approach is: two with the same standard (with the 568A standard or 568B standard)

Green, white brown, brown; the other end: white, green, white orange, white brown, brown, white, blue, white, blue, Orange, blue, white blue