The 82586 performs numerous functions including, among many other things, framing, preamble generation and stripping, source address generation, destination address checking and CRC generation/checking.
An important segment of LAN technology in which the 82586 plays a critical role involves data communications test equipment, commonly known as protocol analyzers. These devices are designed to monitor, as well as generate, traffic on the LAN or Ethernet transmission bus and then analyze it for the purposes of field service; electronic data processing center support; network component research, development, manufacture, installation and service; and general network trouble shooting.