H - Electricity – 04 – Q
Patent
H - Electricity
04
Q
344/25
H04Q 11/04 (2006.01) H04L 12/64 (2006.01)
Patent
CA 1263168
ABSTRACT OF THE DISCLOSURE In a telecommunication system in which alternately circuit-switched and packet-switched information is trans- mitted in time-divided form between transmitter and receiver equipment, a system is described for mutliplexing 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. 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, alternately transfers information from the resepctive equipment in response to the polarity of the status bit. A circuit-switching memory is continuously scanned in a multiplexer. 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, the word from the memory is transmitted to a circuit-switching receiver via a line and a demultiplexer. For an idle time slot in the memory the word which is first in the queue in a buffer memory is included in a packet- switching connection and is transmitted to a packet- switching receiver via the line.
507865
Marks & Clerk
Telefonaktiebolaget Lm Ericsson
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