Multiplex communications – Wide area network – Packet switching
Patent
1980-11-05
1983-11-08
Brigance, Gerald L.
Multiplex communications
Wide area network
Packet switching
3701104, 375110, H04J 306
Patent
active
044146639
ABSTRACT:
In a time division multiplex system having chronological grouping of optically transmittable PPM signals, the PPM signals of one half of the time channels are transmitted as pulses in one half of each pulse frame and the PPM signals of the other half of the time channels are transmitted as pulse pauses in the other half of each frame for the purpose of the co-transmission of a clock frequency component without providing a separate synchro time slot. For this purpose, PPM pulses are formed and transmitted only in one pulse frame half, while PPM pulses formed in the other pulse frame half are subtracted from a continuous signal corresponding in amplitude to the pulse amplitude, and the signal difference is transmitted. At the receiver, the frame clock component is filtered out by a band-pass filters and is exploited for controlling a receiving clock generator.
REFERENCES:
patent: 3402264 (1968-09-01), Ellis et al.
patent: 3898388 (1975-08-01), Goodwin
patent: 4054754 (1977-10-01), Nicodemus et al.
Kato, D., "High-Quality Broad-Band Optical Communication by Time-Division Multiplexed Pulse Analog Modulation: Nonlinearity in Diode Lasers," IEEE Journal of Quantum Electronics, vol. QE-14, No. 5, May 1978, pp. 343-346.
Brigance Gerald L.
Siemens Aktiengesellschaft
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