Multiplex communications – Channel assignment techniques – Carrier sense multiple access
Patent
1998-02-19
2000-12-26
Nguyen, Chau
Multiplex communications
Channel assignment techniques
Carrier sense multiple access
370470, 370522, H04L 12413, H04L 316, H04L 312
Patent
active
06167057&
ABSTRACT:
In a data communication system in which many nodes are connected to a common data bus so that each node can communicate with other nodes, a data frame to be transmitted from a node to other nodes includes a message having a variable length interposed between a signal indicating the length of the message and a signal indicating the end of the message in the frame. The message and the signals are coded according to a coding rule such as NRZ, and a bit stuffing rule is applied to the signal indicating the length of the message and the message while another rule violating the bit stuffing rule is applied to the signal indicating the end of the message. When the message length is changed due to noise or other causes in the course of data transmission, the signal indicating the end of the message is clearly detected at a receiving end because it is coded according to a rule different from the rule applied to the message and other signals. Further, since the length of the message actually received at the receiving end can be compared with the signal indicating the length of the message, transmission error can be detected without fail.
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patent: 5856976 (1999-01-01), Hirano
Kishigami Tomohisa
Sasaki Akihiro
Shinojima Yasushi
Tanaka Akihiro
Uehara Shigeru
Denso Corporation
Nguyen Chau
Nguyen Toan
Toyota Jidosha & Kabushiki Kaisha
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