Test system for a T carrier type telephone PCM communications sy

Details Test system for a T carrier type telephone PCM communications sy Test system for a T carrier type telephone PCM communications sy

1975-01-14

1976-06-22

Olms, Douglas W.

H04B 160

Patent

active

039653099

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.

REFERENCES:
patent: 3649777 (1972-03-01), Matsushima
patent: 3739098 (1973-06-01), Camiciottoli et al.
patent: 3764760 (1973-10-01), Marchini
patent: 3770913 (1973-11-01), Camiciottoli et al.
patent: 3842220 (1974-10-01), Arras

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