Serving constant bit rate traffic in a broadband data switch

Details Serving constant bit rate traffic in a broadband data switch Serving constant bit rate traffic in a broadband data switch

H - Electricity

04

Q

H04Q 11/04 (2006.01) H04J 3/22 (2006.01) H04L 12/52 (2006.01) H04L 12/56 (2006.01)

Patent

CA 2043600

-9- Abstract This invention relates to a method and apparatus for transmitting constant and variable bit rate traffic in a broadband ISDN switch. Data from constant bit rate sources such as television cameras is entered into a group of queues. Each member of the group for queuing data of a different band of bit rates. Data is transmitted from these queues with highest priority from the queue storing data of the highest band of bit rates. If the longest enqueued entity of data in one of the other queues has been enqueued for more than a prespecified period, its priority is increased. Analytic studies have shown that use of three queues for constant bit rate traffic and a fourth queue for variable bit rate traffic allows a high occupancy in the output channels to be maintained with a negligible number of data entities excessively delayed.

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