Multiplex communications – Pathfinding or routing – Switching a message which includes an address header
Patent
1996-10-29
1998-07-07
Hsu, Alpus H.
Multiplex communications
Pathfinding or routing
Switching a message which includes an address header
370445, 370910, 370911, 375211, 395653, H04L 1246, H04L 1266
Patent
active
057779961
ABSTRACT:
An inter-repeater backplane that allows seamless integration of multiple repeaters into a single hub and wherein each repeater may be swapped out without causing the backplane to crash, hang-up or pass error messages. The mixed signal state machines operate in conjunction with the dual analog, digital collision signaling scheme so that repeaters can be removed from the hub without causing the remaining repeaters in the hub to malfunction. Additional drivers or external glue logic are not needed for arbitration because PORTN and PORTM information is embedded within the backplane signals. Thus, the backplane scheme according to the present invention is completely seamless. The present invention provides a bus of electrically conductive signal lines coupled between repeaters for communicating electrical signals therebetween, collision signaling scheme that uses both analog and digital signals to convey state machine information to adjacent repeaters over the bus, collision force scheme for indicating transmit collision over the bus, monitor scheme for determining when transmit collision and PORTM conditions occur and mixed signal state machines for implementing the functions of the repeaters and controlling the transitions on the backplane. Thus, the unique analog digital backplane combination in conjunction with the repeater/IRB state machine makes bus arbitration unnecessary.
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Chan David T.
Heideman Joseph E.
Shafir Haim
Wong David S.
Wurster Stefan M.
Hsu Alpus H.
Level One Communications Inc.
Rao Seema S.
LandOfFree
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