rj45 -minimum how many cores require to connect rj45 between router and pc?

Question

At LAN we are using 8 cores but only 4 cores are used for fuctioning. Why dont use 4 core cable instead of 8 core cable? If we are using 4 core cable what are the problem will come. what are the benefit while using 8 core cable?

Answer 1

the additional pairs can be used for everything from full-duplex operation to PoE, to gige.

can you run a data connection over a 2 pair cable? yes. will it work? your results will vary based on the clocking speed, distance, shielding, pairings, etc. it's not reccomended, there are a lot of resons why the specific pairs in a 4 pair cable are used for certain things, but people that simply say "no, it won't work" are on very shaky ground.

i've run 10mbps data connections over a LOT of different cables in a pinch - but only as an interim solution until we could get the right cable.

Answer 2

You need to use the 8 core Cat 5, 5e or 6 cable. Although only 4 are used, the unused wires help to shield the run and affect the impedance and capacitance of the run.

If you used 4 core cable, it would not work; the NICs would never link up.

If you don't wire it up property -- the orange pair on pins 1 & 2 and the green pair on pins 3 & 6, it will not link up.

If you use 8 core cable other than Cat 5, 5e or 6, it will not link up.

If you attempt to use the unused cores for other runs or telephones, nothing will work.

The impedance, capacitance, shielding and maximum length are all critical components of the 568B UTP Ethernet standard. Any deviation from the standard will result in severely reduced performance or complete failure of the network.

Answer 3

I agree with the Bostonian,the only thing I could add is if you don't use cat 5 cable or better and adhere to these standards nothing in your network will be compatible with future improvements to your LAN. Having 8 cores provides the scalability to go to full-duplex at some point in the future for your LAN.