Browse Prior Art Database

Composite Mini-Packet Switching

IP.com Disclosure Number: IPCOM000036508D
Original Publication Date: 1989-Oct-01
Included in the Prior Art Database: 2005-Jan-29
Document File: 3 page(s) / 54K

Publishing Venue

IBM

Related People

Dumas, GP: AUTHOR [+2]

Abstract

This article proposes an efficient means for conveying voice information within a fast packet switching system, which simultaneously services high-speed data lines and low-speed voice lines.

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Composite Mini-Packet Switching

This article proposes an efficient means for conveying voice information within a fast packet switching system, which simultaneously services high-speed data lines and low-speed voice lines.

Within such a system, both data and voice information are conveyed as mini- packets from a source line adapter to a destination line adapter via a self-routing switching mechanism. All adapters operate identically: each converts information into mini-packets; a voice mini-packet differs from a data mini-packet in priority and in information size, not in packet format or in routing mechanism. Each element of the switching mechanism routes mini-packets based on priority and routing data.

This article proposes an enhancement to the switching mechanism: the mechanism conveys only large mini-packets among its internal elements; these large mini-packets, called "Composite Packets" combine the information from a number of short mini-packets, specifically from short packets routed to the same destination element, and of the same priority.

The "Combining" function is performed entirely within the switch fabric, specifically by those internal elements which need efficient transmission to other internal elements. Fig. 1 shows such a switch fabric. An SFA is a line adapter; an SFE is a switching element; an SFE/CPS is an SFE with a Combining Function. A conversation from Line 1 to Line 2 is encoded as short mini-packets from source SFA to switch

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node A; is encoded within Composite Packets from switch node A to B to C; and again as short mini-packets from switch node C to D to destination SFA. Note that Composite Packets intermix freely with any other packet type.

The mechanisms for the "Combining" function are two: a "Composer" mechanism and a "Decomposer" mechanism.

The "Composer" mechanism r...