| 摘要 |
1. A circuit arrangement for combining and separating speech and data in transmission via a digital switching network (24), especially for PABXs (10), wherein two or more terminal stations, which may be composed of a multiplicity of telephone subscriber terminal devices (12) and data terminal devices (14), and a data-processing system (208) are connected to the digital switching network (24), characterized in that the circuit arrangement comprises for each terminal station a transmission interface unit (20) which in each case is connected via a digital interface (22) to the digital switching network (24) and in each case to a control unit (34), that the data-processing system (208) is connected via a further digital interface (210) to the switching network (24), that N-bit data words which are received in the transmission interface unit (20) are written as half-byte data words, to which a half-byte indication bit (HI/LO) is added, into a character/data memory (322) of the digital interface (22), that digital speech received in the transmission interface unit (20) and a first half-byte data word read out from the character/data memory (322) is inserted, in the digital interface (22), into a multi-bit word of a channel within a multi-channel frame and synchronized with the frame-time positions of the digital switching network, that in each case a further half-byte data word and digital speech are inserted into and synchronized in the same channel of a subsequent frame and that these frames, which contain channels with speech and data, are transmitted via the digital switching network (24) to all terminal stations and to the data-processing system (208), the speech and the data being extracted in the digital interfaces (22). |
