Bridge communication system
Routing system to interconnect local area networks
Nested frame communication protocol
Circuitry and method for fair queuing and servicing cell traffic using hopcounts and traffic classes
Apparatus having priority order storages for recovery from failure of multiplex data transmission
Apparatus for connecting multiplex transmission systems
Low delay or low loss switch for ATM Patent #: 5390176
ApplicationNo. 411679 filed on 04/04/1995
US Classes:370/462, Arbitration for access to a channel370/404Ring or loop forms backbone for interconnecting other networks
ExaminersPrimary: Safourek, Benedict V.
Attorney, Agent or Firm
International ClassH04L 012/66
Foreign Application Priority Data1992-10-05 FI
AbstractA method for assigning priority to traffic between LANs interconnected via a backbone network and connected to the backbone network over a transmission line. To be able to control the maximum delays, especially with traffic having a high interactivity requirement, (a) the length of a frame received from the LAN is determined with a predetermined accuracy, thus obtaining at least two length categories having a respective priority status; (b) at least one address of a pair of addresses formed by the source and destination address of the received frame is compared with the corresponding addresses of frames currently waiting for transmission in a queue of frames with a lower priority status than the priority status corresponding to the length of the received frame, or frames which have been in the queue during a predetermined preceding period of time (Tp); (c) frames to be forwarded are applied to at least two different transmission queues with different priority status on the basis of the classification into length categories and the address checking; (d) at least some of the frames to be transmitted are marked so as to distinguish the priority frames from the other frames; and (e) the marking is checked at a buffering point, and the frames are forwarded in accordance with the marked priority status.