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In Cat5 how many pairs are used to Transmit and Receive?

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Question added by Sajjad Haider Abbasi , Manager – IP Core Networks , Satcomm (Pvt) Ltd.
Date Posted: 2014/01/04
Muhammad Junaid Sadiq
by Muhammad Junaid Sadiq , IT MANAGER , Imtiyazat Alriyada General Contracting Company

In Cat5,2 pairs are used to send and receive data- one pair1-2 for transmission and other pair3-6 for receiving.

Asim Ali
by Asim Ali , SAP HCM Support Officer , Al Tilal Steel Company Limited

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

cat5 cable

Saqib Mehmood
by Saqib Mehmood , Technical Team Lead/Safety Supervisor , Xchange Technology Group

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.

Daoud Daoud
by Daoud Daoud , Information Technology Operations Team Lead , Hikma Pharmaceuticals - Jordan

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  

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