Transmitting Data over Ethernet UTP
One of the Physical Layer Standards defines Twisted Pair Cable Standards.
To send the Data over a Twisted Pair Cable that uses Copper as a medium, it first creates a circuit between the two nodes using RJ45 Jack.
There are 8 Wires (Wt Orange-Orange, Wt Green-Green, Wt Blue-Blue, Wt Brown-Brown) creating 4 pairs inside a Twisted Pair Cable.
Each pair (Wt Orange-Orange) creates a circuit where one Transmits the current & another receives the current at a time.
After creating a circuit two nodes follow a rule called Encoding Scheme which converts the Digital Data into a sequence of bits then again to Digital Data.
Earlier Computers used to follow a 4 bits BCD (Binary Coded Decimal) Encoded Scheme which allowed the computers to encode & decode Decimal Numbers only.
Now Computers follow 16 bits UNICODE (Universal Code) Encoding Scheme which enables the computers to encode & decode not only Numbers but also Characters & Symbols as well.
PC, ROUTERS & WAP's Ethernet Interface Transmits on Pin 1&2 and Receives at Pin 3&6 whereas HUB & SWITCH Transmits at Pin 3&6 and Receives on Pin 1&2.
Reference:
CCNA 200-301 OCG, Volume 1, Pg. 39 - Wendell Odom.
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