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Primary Examiner: Olms, Douglas W.
Assistant Examiner:
Attorney: Leydig, Voit, Osann, Mayer & Holt, Ltd.

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Title: Method and apparatus for testing tone generators

Abstract: Apparatus and methods for testing digital tone generators in a digital time division, multiplex telecommunications switching system. The tone generator produces both continuous and interrupted tones, and testing of any tone is accomplished by determining if its successive PCM words are stuck-at-dc. (SDD) and if it is an idle tone (ITD). The combinations of ITD and SDD determine whether (i) the tone generator being tested is malfunctioning, (ii) the test method or apparatus itself has failed, or (iii) the tone generator is functioning properly.

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Other info:

Inventors: Pitroda, Satyan G. (Villa Park, IL, US)
Min, Byung C. (Belmont, CA, US)

Application Number: 024544
Filing Date: 1979-03-28
Publication_date: 1980-08-19
Assignee: Wescom Switching, Inc. (Oak Brook, IL)
Primary Class(es): 370/244 370/525, 370/526, 379/31, 714/738
Other Classes:
US Patent Ref:

3582577	Jun, 1971	Ribner	179/175.
4071704	Jan, 1978	Moed	179/15.
4132871	Jan, 1979	Lake	328/14.

Other Refs: Other References: UK patent application, GB 200/228 A 1-24-79.