Dear Sir, I have to wired up RJ45 connectors to one side of the cable and I/O to the other side, but I dont know exactly the colour scheme. The RJ45 Connector side of the cable will be plugged in the hub and from I/O I have to connect a PC through a straight UTP CAT 5 cable. Can you kindly guide me through this scenario ?

The most common cabling is EIA/TIA-568B. Hold the connector between your forefinger and thumb, with the cable running through your palm, and the connector pins up (towards your thumb). The pins are numbered 1 to 8, left to right when looked at this way (as though you're looking at your thumbnail). 1 - Orange/White 2 - Orange 3 - Green/White 4 - Blue 5 - Blue/White 6 - Green 7 - Brown/white 8 - Brown For a straight through cable wire both ends like this. NIC's transmit on pins 1 and 2, and receive on pins 3 and 6, so for a crossover cable, swap the orange and green pairs on one end. Cheers! Chase

Oh dear, my diagram shows: 1.White/green tracer 2.green 3.white/orange 4.blue 5.white/blue 6.orange 7.white/brown 8.brown Gawd, I hope I'm right...... ttodd.

Anthony, That's the EIA/TIA 568A definition. It should work fine as well, but for standardization, the B pattern is most commonly used. If you've got the A pattern run, don't trash it. Cheers! Chase