Multiplex communications – Wide area network – Packet switching
Patent
1994-06-30
1996-05-07
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 582, 370 601, 370 61, 370 84, 370 856, 370 942, 34082551, H04L 1254
Patent
active
055153631
ABSTRACT:
A system for controlling the transmission of cells from a network node over multiple Virtual Circuits (VCs) is disclosed. The system performs traffic shaping, as required by connection based systems such as Asynchronous Transfer Mode (ATM), for each VC connected with a network node, so that the Quality of Service (Qos) parameters established when the connection was established are not exceeded. The system includes a process for scheduling the transmission of cells from the network node. The scheduling process periodically scans a table having entries corresponding to virtual circuits connected with the network node. During each scan of the table, the scheduler increments a sustainable rate accumulator field, a peak rate accumulator field, and a latency accumulator field of each table entry that corresponds with a virtual circuit that is open, and for which there is a cell ready to be transmitted. The scheduler further determines if the sustainable rate accumulator value is greater than or equal to a predetermined value and whether the peak rate accumulator value is greater than or equal to a predetermined value. If both conditions are true, then a cell may be transmitted on the virtual circuit corresponding with that table entry. The system further provides that transmissions are scheduled on virtual circuits having the greatest latency since previous transmissions.
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Ben-Michael Simoni
Ben-Nun Michael
De-Leon Moshe
Koning G. Paul
Ramakrishnan Kadangode K.
Blum Russell W.
Dagg David A.
Digital Equipment Corporation
Olms Douglas W.
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