Method and apparatus for testing tone generators

Details Method and apparatus for testing tone generators Method and apparatus for testing tone generators

1979-03-28

1980-08-19

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

179 84VF, 371 27, H04J 312, H04J 314

Patent

active

042185890

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.

REFERENCES:
patent: 3582577 (1971-06-01), Ribner
patent: 4071704 (1978-01-01), Moed
patent: 4132871 (1979-01-01), Lake
UK patent application, GB 200/228 A 1-24-79.

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