Multiplex communications – Wide area network – Packet switching
Patent
1983-11-04
1985-04-02
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
179 18BC, H04J 300
Patent
active
045091668
ABSTRACT:
Process and circuit for carrying out said process for control of the transmission of PCM signals between subscriber stations of a PCM time-division multiplex communication network in a conference service by means of a central conference control circuit in which a central processing unit allots to each station involved in a connection a transmitting pulse with cyclically repeated transmission time slots occurring in sequential pulse brackets of time frames and a receiving pulse with cyclically repeated receiving time slots occurring in sequential pulse brackets. The PCM signals are algebraically summed immediately upon their receipt and temporarily stored in a manner specific to the receiving station only until the expiration of the next succeeding period of signals not relevant to the conference, at such time when they will be transmitted to their respective conference related stations and subjected to a partial summation. The invention avoids a long delay between the respective receiving and transmitting processes and further simplifies the control of the signal processing and the central conference control circuit.
REFERENCES:
patent: 3908089 (1975-09-01), Picandet
patent: 3984643 (1976-10-01), Inrig et al.
patent: 4119807 (1978-10-01), Nahay
Nixdorf Computer AG
Olms Douglas W.
Scutch III Frank M.
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