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US 5,844,904 AGranted
Digital message switching system
AssigneeSiemens Aktiengesellschaft
InventorsYousif Ammar, Gerald Hoefer, Michael Alger-Meunier
Life of this patent
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Abstract
A digital message switching system includes at least one digital message switching unit and a plurality of subordinate units each being coupled to the respective switching unit through a respective transmission link. In order to signal a request of a subordinate unit to transmit, that unit first sends at least one message of meaningless content to a higher-ranking unit and only then sends messages of meaningful content.
Claims9
A digital message switching system, comprising:
- at least one digital message switching unit;
- a plurality of transmission links;
- a plurality of subordinate units each being coupled through a respective one of said transmission links to said at least one switching unit, said subordinate units signaling a request to transmit by initially sending at least one message of meaningless content to a higher-ranking unit and then sending messages of meaningful content;
- and
- one of said subordinate units delaying a reaction to a message from said at least one message switching unit that said at least one message switching unit is busy with a different subordinate unit, by a delay period at least equal to twice a duration of a message frame.
2 more elements
Dependencies are inferred from the claim text.