H - Electricity – 04 – L
Patent
H - Electricity
04
L
325/7, 340/98
H04L 5/14 (2006.01) H04B 17/02 (2006.01)
Patent
CA 1194174
19 ABSTRACT: A transmission path between two terminal stations for transmitting digital information signals at a predeter- mined rate in one direction via a forward path and in the other direction via a return path comprises regenerative transmitting tele-location commands to the repeaters via the forward path, cattier signals of the rate being on-off modulated in this transmitter by means of an amplitude modulator in accordance with output signals of a command sequence generator, and further comprises in every repeater a loop circuit between forward and return paths having an associated control circuit which cooperates with a detector for the presence of carrier signals in the return path for receiving tele-location commands. Without the use of addresses assigned to the repeaters a reliably operating control circuit of a simple structure is obtained in a tele- location system of this type by so arranging the command sequence generator that it produces command sequences which are each formed by a pulse train having at least one pulse, the pulses being transmitted by interrupting the carrier signals by means of the amplitude modulator.
385344
Lucent Technologies Inc.
Van Steinburg C.e.
LandOfFree
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