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

1990-08-23

1992-09-22

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 60, 370 61, 370 856, 370 941, H04J 322

Patent

active

051503581

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.

REFERENCES:
patent: 5014265 (1991-05-01), Hahne et al.
L. Kleinrock, "Queueing Systems", vol. 2, Computer Applications, 1976, pp. 126-135.
L. Kleinrock, "A Delay Dependent Queue Discipline", Naval Research Logistics Quarterly, 11, 1964, pp. 329-341.
"ATM Priority in the B-ISDN", Australia, CCITT, Study Group XVIII-Contribution No. D.140, Jun. 1989, Geneva, pp. 1-6.
"Project 802-Local & Metropolitan Area Networks", IEEE 802.6-89/45, Aug. 7, 1989, pp. 23-36.

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