Communication apparatus having function to record communication

Details Communication apparatus having function to record communication Communication apparatus having function to record communication

1990-07-23

1994-07-19

Beausoliel, Jr., Robert W.

Excavating

G06F 1110, H03M 1300

Patent

active

053316479

ABSTRACT:
A communication system comprising a communication path through which a message passes and, a plurality of communication apparatus, each apparatus includes a message transmission function to the communication path, and a read function for reading the message from the communication path. Each communication apparatus has a communication cumulative amount table so as to store the communication cumulative amount of messages transmitted by each communication apparatus as communication history data. The communication apparatus adds the latest communication cumulative amount in the communication cumulative amount table to a message which is transmitted to the communication path. The communication apparatus compares the stored communication cumulative amount table with the received communication cumulative amount. Thus, troubles of the communication subjects in the communication apparatus according to the result of the comparison can be detected. In addition, without complicated operations of each communication apparatus, while the overhead of processes is kept low, it is possible to prevent a bad effect due to a trouble or error of communication apparatus from being propagated to other communication apparatus.

REFERENCES:
patent: 4868824 (1989-09-01), Golden
"Cluster Control Protocol For Highly Reliable Broadcast Communication", Proc. of the IFIP Working Conf. on Distributed Processing; M. Takizawa; 1988.
"Reliable Broadcast Protocols", ACM TOCS, vol. 2, No. 3; J. Chang, N. F. Maxemchuk; Aug., 1984.

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