Modems

• Modem is an acronym for MOdulator/DEModulator

• Internal or external

• A Modem takes the electrical pulses received from a terminal or a computer and converts them into a continuous analog signal that is needed for transmission over an analog voice grade circuit

• Speeds very from 2400 to 1,544,000 and over

• Standard Modems accept commands from a microcomputer keyboard

• Intelligent Modems

  • contain microprocessor chips and ROM,
  • provide sophisticated communication protocols and internal diagnostic checking
  • boundaries between modems and
    • multiplexers,
    • security restrictor devices,
    • encryption devices,
    • error detection and transmission devices etc. are disappearing

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