Multiplex communications – Diagnostic testing – Determination of communication parameters
Patent
1997-06-27
2000-10-31
Martin-Wallace, Valencia
Multiplex communications
Diagnostic testing
Determination of communication parameters
370448, H04L 1226
Patent
active
061413275
ABSTRACT:
A network station transmitting on a half-duplex Ethernet (802.3) half-duplex media includes a delay credit counter that tracks a delay interval after transmission of a data packet to ensure the network station operates according to an assigned transmission rate. The delay credit counter is decremented by a delay count calculated based on the number of transmitted data bytes and the assigned rate of the network station, and incremented during non-transmitting (i.e., idle) intervals by the network station. The network station defers from transmitting on the half-duplex network media until the delay credit counter has a counter value greater than or equal to zero, resulting in a reduced number of collisions between network stations. In the event of a collision, a network station performs a modified collision mediation based upon the assigned bandwidth, where a range of slot times generated according to the truncated binary exponential backoff (TBEB) algorithm is divided into lower and upper integer ranges, where a network station having a greater assigned bandwidth has a greater probability of selecting the lower range of integers, resulting in a greater probability of winning collision mediation.
REFERENCES:
patent: 5418784 (1995-05-01), Ramakrishnan et al.
patent: 5642360 (1997-06-01), Trainin
Hanna Ganatios Y.
Kalkunte Mohan V.
Advanced Micro Devices , Inc.
Martin-Wallace Valencia
Nguyen Kim T.
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