Communication system having designated transmission lines

Details Communication system having designated transmission lines Communication system having designated transmission lines

1982-02-16

1984-07-31

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

370 16, H04Q 1104, H04J 302, H04J 314

Patent

active

044633505

ABSTRACT:
A communication system is provided in which a plurality of communication devices communicate with one another over a plurality of transmission lines. One of the communication devices operates as a master station, while the remaining devices are slave stations. The master station periodically transmits transmission line specifying signals which specify or identify which of the transmission lines is to be used by the devices for communicating with one another. The master station, when operating normally, will periodically change the transmission line in use so that each of the plurality of transmission lines is used in turn and for substantially similar periods of time. At such time as any one of the slave stations detects a problem in a transmission line in use, that slave station will transmit an abnormality detected signal. The master station, in response to the receipt of such an abnormality detected signal, will transmit a transmission line specifying signal which specifies for use transmission lines other than the one which has been identified as having a problem. Thus, only transmission lines that are functioning properly are used to transmit and receive signals between communication devices of the system.

REFERENCES:
patent: 4228535 (1980-10-01), Workman et al.
patent: 4347603 (1982-08-01), Jacob et al.
patent: 4347605 (1982-08-01), Hashizume et al.
patent: 4376999 (1983-03-01), Abbott et al.

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