Method and apparatus for testing tone generators
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United States of America Patent
Stats
-
Aug 19, 1980
Grant Date -
N/A
app pub date -
Mar 28, 1979
filing date -
Mar 28, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
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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