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communications protocol
Last modified: Sunday, September 01, 1996 

All communications between devices require that the devices agree on the format of the data. The set of rules defining a format is called a protocol. At the very least, a communications protocol must define the following:
  • rate of transmission (in baud or bps)
  • whether data is to be transmitted in half-duplex or full-duplex mode
  • In addition, protocols can include sophisticated techniques for detecting and recovering from transmission errors and for encoding and decoding data.

    The table lists the most commonly used protocols for communications via modems. These protocols are almost always implemented in the hardware; that is, they are built into modems.

    In addition to the standard protocols listed in the table, there are a number of protocols that complement these standards by adding additional functions such as file transfer capability, error detection and recovery, and data compression. The best-known are Xmodem, Kermit, MNP, and CCITT V.42 . These protocols can be implemented either in hardware or software.

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    Describes and explains differences between some of the most used serial communications protocols such as I2C, ACCESS.bus, and SMBus.

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    related categories

    Communications Standards

    related terms

    asynchronous

    Bell 103

    Bell 212A

    bps

    CCITT

    communications

    Content Vectoring Protocol

    full-duplex

    half-duplex

    HDLC

    IDNX

    IPX

    NRZI

    protocol


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