Multiplex communications – Wide area network – Packet switching
Patent
1981-01-26
1983-06-14
Robinson, Thomas A.
Multiplex communications
Wide area network
Packet switching
179 2DP, H04J 300, H04Q 1104
Patent
active
043887180
ABSTRACT:
A digital telecommunication system has a plurality of 64 kbit/s channels subdivided into respective 56 kbit/s primary channels and 8 kbit/s auxiliary channels. Continuously from subscriber-to-subscriber, the 56 kbit/s primary channels serve respectively alternately for the transmission of pulse code modulated or delta modulated speech signals and/or rapid fixed image transmission or rapid data transmission, whereas the 8 kbit/s auxiliary channels are only available for the transmission or exchange-oriented signaling characters, slow fixed image transmission, slow data transmission from subscriber-to-subscriber, as well as for transmission of subscriber-to-subscriber control information and/or remote control and similar special service information. In the switching centers, the 8 kbit/s auxiliary channels of all subscribers of an appertaining switching center are constantly read and signaling characters and special service information are mixed in or mixed out by the switching center in accordance with the service information signals attached to the information transmitted in the 8 kbit/s auxiliary channels.
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Gerke Peter
Petersen Joachim
Robinson Thomas A.
Siemens Aktiengesellschaft
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