Title: Test system for a T carrier type telephone PCM communications system

Abstract: A test system for a T carrier type telephone PCM communications system converts typical trio type pulse sets to quadruple sets in order to eliminate the dc offset. Thus, the test signal can be passed through several successive spans or through marginal repeaters in a manner similar to an ordinary data signal. The trio to quadruple conversion is accomplished by a stuffing procedure which compensates for any ambiguity in the audio crossover when the initial test signal is being produced. A reconverter may be remotely actuated to test any particular span or to loopback the test signal whereby testing may be carried on at a single location for both incoming and outgoing lines.

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Inventors: Dotter, Jr., Berton E. (Belmont, CA, US)

Application Number: 540813
Filing Date: 1975-01-14
Publication_date: 1976-06-22
Assignee: TRW Inc. (Los Angeles, CA)
Primary Class(es): 375/211 375/213, 375/242, 375/289
Other Classes:
US Patent Ref:

3649777	Mar, 1972	Matsushima	179/175.
3739098	Jun, 1973	Camiciottoli et al.	179/175.
3764760	Oct, 1973	Marchini	179/175.
3770913	Nov, 1973	Camiciottoli et al.	179/175.
3842220	Oct, 1974	Arras	179/175.

Other Refs:
Primary Examiner: Olms, Douglas W.
Assistant Examiner:
Attorney: Flehr, Hohbach, Test, Albritton & Herbert