Browse Prior Art Database

Switch for a Buffer Reduction in a Multiple Transponder System

IP.com Disclosure Number: IPCOM000044902D
Original Publication Date: 1983-Jan-01
Included in the Prior Art Database: 2005-Feb-06
Document File: 2 page(s) / 55K

Publishing Venue

IBM

Related People

Besseyre, JA: AUTHOR [+2]

Abstract

A multitransponder satellite communications controller is disclosed, which minimizes the buffer requirements for the receive buffers.

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Switch for a Buffer Reduction in a Multiple Transponder System

A multitransponder satellite communications controller is disclosed, which minimizes the buffer requirements for the receive buffers.

U.S. Patent 4,307,461 describes a single transponder satellite communications controller. When the satellite has multiple synchronized transponders on it and each ground controller has a unique transmission path and a multiple receive path for communicating over the several transponders in the satellite, the problem of simultaneous reception arises. Bursts may occur simultaneously in the three transponders, and therefore a multiplexer path cannot be employed without proper precautions.

The total traffic addressed to a particular ground station during a frame is limited by its connection capability. However, in a multiple transponder system this traffic can be spread across all transponders. The station must examine each traffic burst channel address to determine if it should be accepted. Accepted traffic can occur simultaneously in all transponders, and must be stored so that traffic channels can be passed one at a time to the communications controller.

The figure is a receive data flow for a three-transponder system. Data from each transponder is directed to an address check circuit which identifies traffic addressed to this particular station; other traffic is rejected. The switch/control circuit routes accepted traffic to the buffers.

The total capacity of a buffer s...