System for changing priority of packets of data

Details System for changing priority of packets of data System for changing priority of packets of data

1988-06-24

1990-05-01

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 941, H04Q 1104

Patent

active

049224859

ABSTRACT:
A system for switching information packets assigned with two levels of semantic priorities between entering time muliplex lines and outgoing time multiplex lines, the read address of a packet in a buffer memory of a switch being stored in a queueing file associated with an outgoing port intended to transmit the packet. The read address is accompanied by a bit which defines the priority level of the packet. Each queueing file is comprised of two zones in series between the input and the output. Means is included for writing in the first zone only when the second zone is full, the first zone is accessible only to high priority level packets between the reading of files. The rear addresses of low priority level packets, which were stored earlier than the read address of high priority level packet the oldest still being present in the file, is overwritten in equal number, at a maximum, to the number of read addresses stored in the first zone.

REFERENCES:
patent: 4570257 (1986-02-01), Olson et al.
patent: 4644533 (1987-02-01), Braff et al.
patent: 4757529 (1988-07-01), Glapa et al.
patent: 4769811 (1988-09-01), Eckberg et al.
patent: 4788679 (1988-11-01), Kataoka et al.

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