Telegraphy – Systems – Line-clearing and circuit maintenance
Patent
1971-02-04
1976-08-31
Stellar, George G.
Telegraphy
Systems
Line-clearing and circuit maintenance
178 69A, 178DIG4, 178DIG13, 179 15BE, 1791753R, 324 57SS, 324 58A, H04N 710, G01R 2704
Patent
active
039782824
ABSTRACT:
A substantially non-interfering, low-intensity sweeping test signal is transmitted along a network to be tested. Means are provided for receiving and tracking the test signal at the opposite end of the network. A reference signal is transmitted along with said test signal for alerting and synchronizing the operation of the tracking means. The reference signal is at a frequency outside of the range of operating or normal signals transmitted over the network. Desirably the reference signal comprises a sweeping and a fixed frequency signal. These are then used to generate the sweeping test signal. Also, the reference signal is used by the tracking means for processing the received test signal.
REFERENCES:
patent: 1590362 (1926-06-01), Gibson
patent: 2588730 (1952-03-01), Johnson
patent: 2685062 (1954-07-01), Schroeder et al.
patent: 2945178 (1960-07-01), Doba, Jr.
patent: 3360729 (1967-12-01), Palatinus
patent: 3487169 (1969-12-01), Miyagi
patent: 3651403 (1972-03-01), Fluck, Jr.
patent: 3697878 (1972-10-01), Georgescu
Avantek, Inc.
Stellar George G.
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