About repeaters and common twisted pair problems
At A, for example, I put a repeater, which can amplify the network signal to 500 meters. In the middle, I directly pull a 500 meter net line can be, B point and then put a repeater, connect a cable to the computer, you can access the internet.
If the length of the cable Ethernet Repeater often use bus standard, thinnet each maximum length of 185 meters, up to 5, thus increasing the repeater, the maximum length of the cable network can be increased to 925 meters.
The function of the repeater is to regenerate and transmit the received signal so as to increase the distance of signal transmission. It is the simplest network interconnection device that connects two or more network segments of the same network.