Multiplex communications – Wide area network – Packet switching
Patent
1986-04-29
1988-01-05
Griffin, Robert L.
Multiplex communications
Wide area network
Packet switching
H04J 324
Patent
active
047180625
ABSTRACT:
The invention relates to a telecommunication system in which alternatingly circuit-switeched and packet-switched information is transmitted in time-divided form between transmitter and receiver equipments.
A system is described for multiplexing telephony channels with static and dynamic capacity. A static channel occupies a time slot in a fixed frame structure. The dynamic channels utilize idle time slots. A status bit per time slot states whether the time slot is occupied or not. According to the invention, equipment for transmitting circuit-switched information is combined with equipment for transmitting packet-switched information, such that a hybrid system is obtained which, under the control of a status bit, alternatingly transfers information from the respective equipment in response to the polarity of the status bit.
A circuit-switching memory (CS) is continuously scanned in a multiplexer (DS1). Data words are stored in the memory, each word corresponding to a time slot, which in turn corresponds to an information channel in a TDM system. A status bit of the mentioned kind is inserted in each data word.
For an occupied time slot in the memory CS the word from the memory CS is transmitted to a circuit-switching receiver (CR) via a line (L) and a demultiplexer DS2.
For an idle time slot in the memory CS sends the word which is first in the queue in a buffer memory PS included in a packet-switching connection and is transmitted to a packet-switching receiver PR via the line L.
REFERENCES:
patent: 3564144 (1971-02-01), Diggelmann et al.
patent: 3988545 (1976-10-01), Kuemmerle et al.
patent: 4238851 (1980-12-01), Takahashi et al.
patent: 4408323 (1983-10-01), Montgomery
Chin Wellington
Griffin Robert L.
Telefonaktiebolaget L M Ericsson
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