H - Electricity – 04 – B
Patent
H - Electricity
04
B
325/46
H04B 3/46 (2006.01) H04B 3/48 (2006.01)
Patent
CA 1132200
D-21,022 APPARATUS AND METHOD FOR REMOTE TESTING OF A LOOP TRANSMISSION PATH by Tom L. Blackburn ABSTRACT OF THE DISCLOSURE A first network can be switched into and out of connection with a lowpass filter disposed at one of the two opposite carrier terminal ends of a loop transmission path employing a double-sideband carrier. When the filter and network are so connected, an oscillator producing a first test signal of selected frequency and amplitude is formed. This signal modulates the carrier wave generated by the existing carrier oscillator at this terminal end. The modulated signal passes along the path to the opposite terminal end where it is demodulated and detected. The detector threshold is set so that the detector responds to the demodulated first test signal, but does not respond to normal voice and other test signals. The detected demodulated signal energizes the station carrier oscillator at the opposite end whereby it's carrier wave is modulated. The resultant second modulated test signal passes back along the path to the original terminal where it is demodulated, and the presence of the carrier is detected. The amplitude of the demodulated signal also may be measured and compared to that of the original test signal to establish the loss in the transmission path.
319900
Gte Automatic Electric Laboratories Incorporated
R. William Wray & Associates
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