Modems andNetwork Interfaces

• Start bits

  • Opposite bit from the system idle state
  • Necessary to alert the receiver to the beginning of a new character

• Stop bits

  • Provide a short delay at the end of each character to give the receiver enough time to convert from serial to parallel

• Error-checking codes

  • Parity bits, CRC bits, etc.
  • Discussed in chapter 6

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