SERIAL V/S PARALLEL TRANSMISSION


Data can be transmitted between a sender and a receiver in two main ways: Serial and Parallel.

Serial Transmission:

  • In serial transmission, data is communicated bit by bit on a single path or communication channel between connected devices.

  • Serial Transmission provides slow speed data communication in comparison to parallel transmission wherein multiple bits are transmitted together on multiple channels.

  • But serial transmission provides reliable data communication in comparison to parallel transmission wherein cross talk in the adjacent bits occurs.

  • Serial transmission is used for long distance data communication because it is easy to maintain a single channel in comparison to multiple channels, and also, it provides error free or noise free data communication as no cross talk occurs in serial communication.

  • RS-232C is a popular serial transmission port specification used for connecting mouse, modem etc. for serial communication.

Advantages of Serial Transmission:

Parallel Transmission:

  • In parallel transmission, there are separate or parallel paths corresponding to each bit so that many bits are transmitted simultaneously.

  • Parallel Transmission offers faster transfer of data because multiple bits are transmitted together.

  • But, it is not practical possible for long distance to use parallel transmission as cross talk can occurs in the adjacent parallel transmitted bits.

  • Therefore, the cable length or channel length remains limited in parallel transmission to minimize the cross talk.

  • LPT port is a popular parallel transmission port specification used for connecting printer, etc for parallel communication.

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