The other two coloreds brown blue pairs of wires are used for another ethernet network application or for phone connections.
Ethernet cable 568b.
In fact patch cable and crossover cable are two types of ethernet cable and they have the same physical characteristics.
Orange pins 1 2 and green pins 3 6.
According to the connection requirement straight through or cross over cable may be required.
The rj45 cable uses only 2 pairs of wires.
Therefore the cable itself will physically perform the crossover function.
In order to normalize the wire arrangement two standards namely t568a and t568b are used to create these two types of.
T 568b straight through ethernet cable both the t 568a and the t 568b standard straight through cables are used most often as patch cords for your ethernet connections.
Crossover cables are occasionally needed for 10base t and 100base t ethernet.
This is rectified by correctly pairing the pins.
Avoid swapping two lines between different pairs.
The wiring standards t568a and t568b are used to create a cross over cable t568a on one end and t568b on the other end or a straight through cable t568b or t568a on both ends.
Straight through cables are used to connect computers to an ethernet switch.
Reference cat5e cable wiring schemes n tron inc.
But what on earth is the difference between the patch cable and crossover cable.
If you require a cable to connect two ethernet devices directly together without a hub or when you connect two hubs together you will need to use a crossover cable instead.