Source : Free On-Line Dictionary of Computing

Hubnet
     
         A 50 Mb/s {optical fibre} {network} developed at
        {Toronto University}.  Network {topology} is a rooted tree
        with a maximum of 65536 hosts with maximum separation of 2 km.
        The {protocol} is multiple access, collision avoidance, echo
        detect and retry.
     
        [Computer Systems Equipment Design, Jan 85].
     
        (1994-11-22)