Difference between revisions of "Communication Methods"
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Revision as of 12:12, 31 December 2016
Contents
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
