Monitoring circuit for a data transmission network
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United States of America Patent
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Feb 18, 2003
Grant Date -
N/A
app pub date -
Jun 11, 1999
filing date -
Jun 12, 1998
priority date (Note) -
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Abstract
A monitoring circuit for a data transmission network having a plurality of transmissive and receptive network nodes and a double-line bus connecting the network nodes and serving for redundant double transmission of digital communications, with a first line (A) and a second line (B) via which communication pulses transferred in the form of time-spaced pulse sequences are transferred in synchronous manner in terms of time slot, a potential change detector is provided by means of which the two lines can each be monitored for the presence of potential change activities and by means of which a condition can be detected in which, during a pulse sequence, potential change activities occur only on the first line, but not on the second line; and a first time measuring circuit is provided by means of which a time measurement of the duration of such a condition can be carried out, and when a predetermined duration of such a condition is exceeded, an error signal is generated.
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