Multiplex communications – Diagnostic testing – Determination of communication parameters
Patent
1997-11-07
2000-12-26
Jung, Min
Multiplex communications
Diagnostic testing
Determination of communication parameters
370470, 370419, 370463, H04J 314, H04L 1228
Patent
active
061670324
ABSTRACT:
A system and method to avoid transmit underruns from a host system to a communication network using an adjustable threshold on a frame basis. The host system includes a device driver, host descriptors and host buffer. The host descriptor define the number of blocks of data to be transferred from the host to the network via a Media Access Control (MAC) device. The MAC device includes a processor, a transmit storage device, and a medium independent interface coupled to the network. The MAC device is connected to the host system via a data bus. A host descriptor is generated for each frame of data transferred by the MAC device from the host to the network. The descriptor is generated by the device driver and provides the MAC processor with a block size of data to be transferred and a threshold in each frame indicating the number of blocks of data to be transferred from the host system to the MAC device to avoid an underrun before transmission to the communication network. The MAC processor generates and transmits a "retry" bit to the device driver when a transmit underrun occurs. The device driver modifies the threshold in subsequent frames to avoid transmit underruns by raising or lowering the thresholds according to the number of retries.
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Allison Samuel Steven
Barker Kenneth James
Johnson Steven Howard
Lee Joseph Kinman
Cockburn J. G.
International Business Machines - Corporation
Jung Min
Redmond, Jr. Joseph C.
Santiago Enrique L.
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