RJ-45 plug is inserted only along a fixed direction and automatically to prevent the shedding of plastic connectors, commonly known as "crystal heads" jargon for the RJ-45 connector (RJ-45 is a network interface specification, similar also RJ-11 interface, is what we usually used a "telephone interface", is used to connect telephone lines). Of the call it "crystal heads" because it causes the appearance of translucent crystal. Are installed at both ends must be twisted-pair RJ-45 plug that in order to plug in the network card (NIC), hub (Hub) or switch (Switch) of the RJ-45 interface, and internet communications.
Figure shows the RJ-45 plug (crystal head) of the cross-section diagram of the pin from left to right order of 1 to 8, respectively, many users in the wiring that often appear in two kinds of errors: one is using one to one connection method (see below), connect the shorter distances, the system does not appear connected to the failure, but a long distance to connect, network busy or high-speed operation, the best connection method using Figure 4, the core is to make three and 6, two pins for the same twisted pair.
Commonly used straight-through and crossover cables.
Crystal head is small, but the importance of the network that can not be underestimated, and in many there is a considerable portion of the network failure due to poor crystal quality caused by the first. Crystal head there are several grades of points, the general good, as AMP (AMP) such as the quality of brand-name makers to be more reliable. But a price than the market, some of the more expensive brand-name. When you purchase your recommended Do not freeloaders, or quality can not be guaranteed, mainly reflected in its probe is a copper contacts, easily rust, resulting in poor contact, the network unreasonable. There is obviously poor quality performance for the plastic buckle bit is not tight (usually caused by deformation), it is very likely to cause bad contact, network disruption.
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