Voice and Data Transmission
Original Publication Date: 1984-Jun-01
Included in the Prior Art Database: 2005-Feb-04
This system enables the transmission of digitized voice information and pure data over the same channel. The voice terminals are connected to the system through tie-lines and PBX, while pure data terminals are connected to the system through V24 CCITT interfaces. Priority should obviously be given to voice transmission. Therefore, the data are inserted within the bit flow based on voice activity detection information. The pure data rate is thus variable. Data information losses are avoided by providing the system with elastic buffering means which are loaded at two predetermined rates. Switching from one of the rates to the other is made dependent upon the elastic buffer contents. The system shown in the figure is made for processing one voice line and one data line only. Extension to several lines is straightforward.