Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – With blocking of normal usage
Patent
1990-09-12
1992-01-14
Schreyer, Stafford D.
Telephonic communications
Diagnostic testing, malfunction indication, or electrical...
With blocking of normal usage
379 16, 371 205, 375 10, H04M 326, H04B 346, H04B 1700
Patent
active
050816667
ABSTRACT:
For generating test words that are sent across a test loop and are monitored at the receiving side for coincidence and with the corresponding, transmitted test word, a memory is read in which such test words that preferably correspond to test words generated by a pseudo-random generator are stored. In the course of the monitoring, the memory is read again under the same address as in the transmission, but delayed by the running time of the test loop, in order to supply the test word that is to be compared to the received test word.
REFERENCES:
patent: 4736402 (1988-04-01), Landis
Blaschek Emil-Franz
Nagler Werner
Tiwald Eckard
Schreyer Stafford D.
Siemens Aktiengesellschaft
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