Telecommunications – Carrier wave repeater or relay system – Two separate way transmission
Patent
1978-05-24
1980-04-08
Griffin, Robert L.
Telecommunications
Carrier wave repeater or relay system
Two separate way transmission
370 74, 370 98, 179170A, H04B 140
Patent
active
041974964
ABSTRACT:
A pilot signal transmission system is disclosed in which two terminal stations transmit signals including link monitoring pilot signals to each other directly or through a repeater station. The terminal stations include a pilot signal switching section responsive to a detection signal from a transmitting pilot detecting section for operating in such a manner that if the detection signal is normal it transmits the output of the pilot transmitting section to the transmitting section, while if the detection signal is abnormal it transmits the output of the filtering section to the transmitting section. In the case of a repeater station, up and down pilot switching sections are responsive to detection signals from the receiving pilot detecting sections for operating in such a manner that the pilot signals filtered by the pilot filtering sections may be either transmitted to the transmitting sections or interrupted, the receiving pilot signal being repeatered jointed with the demodulated signal from the receiving section if the detection signal is normal, while the receiving pilot signal for the opposite direction link being repeatered jointly with the demodulated signal from the receiving section if the detection signal is abnormal.
REFERENCES:
patent: 2892930 (1959-06-01), Magnuski
patent: 3456191 (1969-07-01), Rodenburg
patent: 3470498 (1969-09-01), Serrure
patent: 3974447 (1976-08-01), Lofmark
Griffin Robert L.
Masinick Michael A.
Nippon Electric Co. Ltd.
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