RJ45

[tanmoy50]

Hello,


we don't use 2pair of cable in RJ45.
Still why it's there?

Kindly help me.

 

[icode3]

Sorry I don't really understand your question, but it seems like you are asking about the wire usage of the different cables?

There are different categories of RJ45 cables, in the mainstream market, CAT5, CAT5e and CAT6. CAT5 uses only 2 wire pairs (4 wires) out of the 4 pairs (8 wires) to achieve 100mbps speed or "Fast ethernet speed". CAT5e uses all 4 pairs or 8 wires to achieve gigabit speed (1000mbps or 1gbps) and can be run over a greater distance than CAT5 without much signal loss. CAT6 is basically CAT5e with better shielding/insulation allowing for a "future-proof" design that operates at gigabit speeds.

Essentially, the cables are backwards compatible and "degradable" if you wish to turn a CAT5e into a CAT5 (by splicing the cable) to utilize the extra lines for either phone or another ethernet line, at the cost of speed and signal loss.

I hope this helps!