Multiplex communications – Wide area network – Packet switching
Patent
1980-09-12
1983-06-21
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
375111, H04J 306
Patent
active
043897223
ABSTRACT:
A method for simultaneously transmitting a plurality of data streams over one transmission channel with the aid of modems, wherein in order to synchronize the receiver for the purpose of device-specific modulation, a small additional modulation is applied in the transmitter, with the frequency of the additional modulation being equal to the transmitter modulation rate divided by a whole number, and the additional modulation is demodulated in the receiver by multiplying the associated values obtained from the scanning clock pulse by the difference between the associated and actual values received, and the resulting parameter is freed of interference with the aid of a band pass filter or a phase control loop.
REFERENCES:
patent: 3404231 (1968-10-01), Aaron et al.
patent: 3804985 (1974-04-01), Matsuo
patent: 4121056 (1978-10-01), Stout
CCITT Recommendations V26, V27 and V29, vol. VIII .1, pp. 101-112, 118-139 and 143-153.
"Microcoded Modem Transmitters" by Choquet et al., IBM J. Res. Develop., Jul. 1974.
"Data Transmissions with 4.8 Kbit . . . " from Telefunken Scientific, 1978, pp. 231-245.
Licentia Patent-Verwaltungs-GmbH
Olms Douglas W.
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