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In Cat5,2 pairs are used to send and receive data- one pair1-2 for transmission and other pair3-6 for receiving.
lets say out of4 pairs, there are only2 pairs for transmission and reception.
picture do worth a thousand words and here we can see it
Two Pairs are used to Transmit and Receive the data in CAT5 Cables.
on one end pin1-2 are sender and3-6 are receiver, but the difference is in other end in straight and cross over cable , on other end -->
in straight cable: pin1-2 is receiver and3-6 is sender
in cross over cable: pin1-2 is sender and3-6 is receiver
it is clear from above fact that we can't use straight cable for similiar devices as sending and receiving pins are same on both ends.
read the following link
Cross-over Cables Pin Pin 1 T+ 3 R+ 2 T- 6 R- 3 R+ 1 T+ 4 4 5 5 6 R- 2 T- 7 7 8 8 Straight Cables Pin Pin 1 T+ 1 T+ 2 T- 2 T- 3 R+ 3 R+ 4 4 5 5 6 R- 6 R- 7 7 8 8
