| 摘要 |
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. |
