Multiplex communications – Communication techniques for information carried in plural... – Adaptive
Reexamination Certificate
1998-02-09
2001-02-27
Nguyen, Chau (Department: 2772)
Multiplex communications
Communication techniques for information carried in plural...
Adaptive
Reexamination Certificate
active
06195365
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a process for communicating over a bus simultaneously supporting different bit rates.
2. Discussion of the Background
Multiplexed communication buses are beginning to be used in avionics, and optical versions of these buses are appearing. The ARINC 629 standard relates to such buses. Currently, the information bit rate on such a bus is standardized at 2 Mbits/s, it being the case that certain items of equipment attached to this bus cannot provide a higher bit rate.
However, given that an optical bus can support an information bit rate of much greater than 2 Mbits/s and that avionics equipment or items of equipment which are grouped together in the form of a local unit and are attached to this bus may also send and/or receive information at a bit rate higher than this value, it is possible to envisage that information may be dispatched simultaneously over the same bus at different bit rates.
SUMMARY OF THE INVENTION
The subject of the present invention is a process for communicating over a bus, in particular an optical bus, which is linked up to equipment operating in a send and/or receive mode at different maximum or optimal bit. The process enables information to be dispatched simultaneously over the bus at different bit rates.
The process according to the invention is characterized in that a single time-division multiplexing transmission protocol is used on the bus, in that all the equipment is listening to the bus permanently, in that the items of equipment which require to send information insert it into time windows defined by the item of equipment itself and as a function of the activity of the other items of equipment irrespective of the information bit rate for these items of equipment, and in that each item of receiver equipment detects the activity of the bus, acknowledges the type of bit rate and recreates the information intended for it.
REFERENCES:
patent: 5077732 (1991-12-01), Fischer et al.
patent: 5079763 (1992-01-01), Chao et al.
patent: 5613069 (1997-03-01), Walker
patent: 5784597 (1998-07-01), Chiu et al.
patent: 5793760 (1998-08-01), Chopping
patent: 6026088 (2000-02-01), Rostoker et al.
Nguyen Chau
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Santiago Enrique L.
Sextant Avionique
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