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《通信工程学院学报》 1992-01
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A Novel Conference Circuit for Digital PABX

Chen Jinshan Kou Huadong  
In analog switching system conferences' voice signals cart be added direct to implement conference. But the implementation of conference in digital switching system is more difficult than that in analog switching system, ecause PCM digital voice signals are nonlinear signals and can not be added direct to each other. This paper briefs the principles of digital telephone conference and the implementation techniques. Some problems about conference curcuit design are discussed in this paper, too. We have designed a new type of voice switch conference curcuit for a middlesized conference based on TDM bus digital PABX and the hardware and software flow chart of the circuit are presented in this paper.
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