Communication Methods

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Serial Data Transmission

In serial data transmission each bit is sent one after another by varying the line voltage between 0 & 5 volts for each bit, for two way communication a return wire is required. Serial Data Transmission is commonly used in USB and crossover cables.

Uses

Long distance communication

Advantages

Only need one signal path per way, can be used to route over telecommunications, saves cost of cabling

Disadvantages

Signal strength degrades over distance, so repeaters and so on required


Parallel Data Transmission

Each binary word is transmitted as one, with a signal path for each bit, additional signal paths for Return, Ready/Busy, & one strobe wire are required Ready/Busy is the status of the receiver, strobe wire used after signal placed onto wires on Strobe receiver will set Busy & read after read the receiver sets Ready.

Uses

Short distance data communication

Advantages

Offers faster transmission when compared to Serial

Disadvantages

Skew can easily affect data transmission, leading to errors File:Skew.PNG