To connect two computers or to connect two HUB / Switch with UTP cable, it can use a crossover cable. If you want to connect a computer to a hub / switch, use a straight cable.
In
straight and cross wiring, we can see that the standard has been set
for the wiring problems, the EIA / TIA 568A and EIA / TIA 568B.
EIA / TIA 568A --- EIA / TIA 568B
Straight CableStraight
cable is a term for a cable that uses the same standard on both ends of
the cord, could EIA / TIA 568A or EIA / TIA 568B on both ends of the
cable. Simply put, the order of colors on both ends of the same cable. In
the straight cable, pin 1 on one end of the cable connects to pin 1 on
the other end, pin 2 is connected to pin 2 at the other end, and so on.
So, when the PC sends the data on pins 1 and 2 via cable straight into the Switch, Switch receive data on pins 1 and 2. Well, because the pins 1 and 2 on the switch will not be used to send data as well as pins 1 and 2 on the PC, then the Switchusing pin 3 and 6 to send data to the PC, because the PC receives data on pin 3 and 6.
More details, see the following picture: [click to enlarge]
Straight Cable
Use straight cables:connect the computer to a regular port on the Switch.connect a computer to the LAN port cable modem / DSL.connect the router's WAN port to the LAN port cable modem / DSL.connect the router to a LAN port on the Switch uplink port.connect 2 HUB / Switch with one HUB / Switch using uplink port and the other using a common port
Cable crossoverCable crossover using EIA / TIA 568A on one end of the cord and EIA / TIA 568B on the other end of the cable.
Cable Crossover
In
the picture, pins 1 and 2 at the end of A is connected to pins 3 and 6
at the end of B, as well as pins 1 and 2 at the end of B is connected
to pins 3 and 6 at the end of A. So,
pin 1 and 2 on each end of the cable is used to transmit data, while
pins 3 and 6 on each end of the cable is used to receive data, because
pins 1 and 2 are connected to the opposite pins 3 and 6.
To identify whether a crossover or straight cable is to just look at one end of the cable. If
the order of the color wires on pin 1 is White Green, then the cable is
a crossover cable (but if the other end has the same color sequence is
White Green as pin 1, then the cable is wired Straight). But fortunately, most of the cable using standard EIA / TIA 568B on both ends of the cord.
The use of a crossover cable:connecting 2 computers directlyconnecting 2 pieces HUB / Switch using regular port between the two HUB / Switch.uplink port to connect a computer to the Switchconnect the LAN port on the router to the regular port HUB / Switch
Port usual VS Port uplinkTo connect two HUB / Switch or to connect two computers directly required a crossover cable. But
if the HUB / Switch or Network Interface Card (NIC) or other network
devices provide Uplinkport or MDI / MDI-X, you can use straight cable
to connect to a regular port on the HUB / Switch or Network Interface
Card or other network devices.
