Computersight -

The RJ-45 connector is commonly used for network cabling and for telephony applications. It is also used for serial connections in special cases.

Pin out of Ethernet: Although for a variety of purposes, the RJ-45 is probably the most commonly used for 10Base-T and 100Base-TX Ethernet connections.

As used two pairs of son in the eight-pin RJ-45 Ethernet port to carry signals, and both 10BASE-T and 100BASE-TX uses the same pins, a crossover cable for each other and with Made.

Also keep in mind that it is very important to use a pair for pins 3 and 6. If a driver is used from a couple to 3-pin and used as a conductor with another pair to 6-pin, is diminished.
When used to solve problems in your business or office, if you want to connect a printer to the PC, because of distance and lack of space. Try not automatically extend USB, since the distance was from the computer to the printer about 25 meters. They know that until about 5 USB 7mts max. Try searching now for USB extension over 20 meters, and landed a USB converter, RJ45 to 45mts drive (USB 2.0). But it would not pay to get into their own hands. It creates the option to go to the electronics market for a RJ45 cable. Everybody does it. See below for more connections.

1) RJ45 USB Cable Box-1

Pin # 1 +5 V (RED)

Pin # 2-D (White) USB <———-

Pin # 3 D + (green)

Pin # 4 GND (Black)

2) BOX RJ45-2 USB CABLE

Pin # 1 +5 V (RED)

Pin # 2 D-(white) ————> PC

Pin # 3 D + (green)

Pin # 4 GND (Black)

In the same way that you also use to extend VGA signals. (The only thing is that you need to match the impedance at VGA) again, the question of the session.