<P> SuperStack<SUP></SUP> II Hub TR hubs combine RMON-based management with the most advanced physical layer support in an affordable, expandable platform for mission-critical Token Ring networks. The hubs provide advanced error recovery and fault isolation technology, jitter cancellation and retiming mechanisms, and sophisticated SNMP RMON network management. SuperStack II Hub TR is part of 3Com s SuperStack system, an innovative architecture that allows stackable hubs, bridges, routers, switches, and SNA-to-LAN conversion devices to be easily integrated and managed as one system. </P>