Source : Free On-Line Dictionary of Computing

token bus
     
         (IEEE 802.4) A networking protocol which mediates
        access to a {bus} topology network as though it were a {token
        ring}.  This eliminates the {collisions} found in {carrier
        sense collision detect} protocols.  {Nodes} can be configured
        to pass the token in any order, not necessarily related to
        their physical ordering on the bus.  The token is sent from
        one node to its successor in the logical ring by broadcast on
        the bus and is ignored by the other nodes.
     
        (1996-12-13)