Multiplex communications – Wide area network – Packet switching
Patent
1981-10-07
1984-05-22
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 6, 375 7, 375 11, H04B 144
Patent
active
044505558
ABSTRACT:
The invention is intended to eliminate the far-end crosstalk effects between transmission lines grouped together in one link by employing filtering means already introduced into the receiving channel of a terminal or intermediate station of a half-duplex transmission line. The far-end crosstalk minimizing device is included in a half-duplex digital transmission station linked to a line section whose other end is a grouping point for the lines and which produces an attenuation less than a maximum attenuation. It comprises an equalizing circuit and switches. The equalizing circuit is included in the receiving channel of the station and includes a filter having a transfer gain practically equal to the difference between the attenuation of the line section and the maximum attenuation. The switches introduce the filter in series into the transmitting channel of the station during each transmission operation of the half-duplex station cycle.
REFERENCES:
patent: 3958082 (1976-05-01), Huellwegen
K. Tanaka et al., Studies on Digitalization of Subscriber Loop Transmission System, NTG Gachberichte, pp. 86-90, vol. 73, 1980, ISSLS 80, "The International Symposium on Subscriber Loops and Services", Sep. 15-19, 1980, Munich.
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