Method and apparatus for pacing asynchronous transfer mode (ATM)

Details Method and apparatus for pacing asynchronous transfer mode (ATM) Method and apparatus for pacing asynchronous transfer mode (ATM)

1994-08-16

1996-02-13

Hsu, Alpus H.

Multiplex communications

Wide area network

Packet switching

370 854, 370 856, 370 942, H04L 12433, H04Q 1104

Patent

active

054916917

ABSTRACT:
A method for scheduling asynchronous transfer mode (ATM) data cells for transmission in an ATM system uses a plurality of queues. The plurality of queues are separated into waiting queues of a lower priority and transmit queues of a higher priority. ATM tokens which identify one active channel a piece are positioned in the queues and rotated/shifted to new positions over time. As time progresses, ATM tokens are shifted/rotated from waiting queues of a lower priority to transfer queues of a higher priority wherein the tokens (and therefore specific ATM channels) are selected and ATM data cell(s) are transmitted in response to the selection. This queued/shifted selection process ensures that bandwidth requirements are adhered to in the ATM system. The selected tokens are eventually (after all needed ATM data cell(s) are transmitted for a single selection) re-scheduled to a queue of lower priority.

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patent: 5268896 (1993-12-01), Pauwels
patent: 5381413 (1995-01-01), Tobagi et al.

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