A network system includes end nodes which are connected to a plurality of cascaded hubs. Each hub is able to generate a network error packet when a timeout is detected. More specifically, a first hub starts a first timer upon the first hub acknowledging a grant to a first device connected to a first...http://www.google.es/patents/US5768250?utm_source=gb-gplus-sharePatente US5768250 - Error recovery in a network having cascaded hubs
