A network diagnostic tool for determining the position of a workstation on a local area network (LAN) having timer and echo stations at each end of a multi-access bus. Signals from the LAN workstations propagate in both directions along the bus. When the signals are so propagated, by measuring the time...http://www.google.com/patents/US5226036?utm_source=gb-gplus-sharePatent US5226036 - Network diagnostic tool
