A message priority scheme for use in local areas networks (LANS) operating in accordance with carrier sense, multiple access/collision detect (CSMA/CD) bus access protocol. A LAN station having a high priority message to send ignores the carrier sense signal, and thereby obtains immediate bus access....http://www.google.es/patents/US5353287?utm_source=gb-gplus-sharePatente US5353287 - Local area network with message priority
