Multiplex communications – Wide area network – Packet switching
Patent
1984-04-23
1986-01-21
Griffin, Robert L.
Multiplex communications
Wide area network
Packet switching
1791752R, H04J 116, H04J 314
Patent
active
045660930
ABSTRACT:
A continuity check tone detector for use with a digital telecommunication system and being designed for detecting continuous tones on voice transmission paths temporarily established between a digital tone generator and the detector across a switching network under control of a switch control unit. The tone detector includes detector interfaces receiving serial tone information from each transmission path in order to derive a digital tone sample and serial control information from the switch control unit in order to convert the same into timing and control signals. A digital signal processor under control of said timing and control signals linearizes and filters received tone samples, measures the power thereof, and supplies corresponding output data. A control processor receives this output data for evaluating the same with respect to individually set power level and predetermined duration for determining the presence of a continuous test tone.
REFERENCES:
patent: 3683116 (1972-08-01), Dill
patent: 4081611 (1978-03-01), Boro et al.
patent: 4402074 (1983-08-01), Cupuis et al.
Griffin Robert L.
Jackson Thomas H.
Scutch III Frank M.
Siemens Corporate Res. & Support, Inc.
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