The present invention discloses a distributed scheduling communications device, which includes unit modules and an external transmission
bus, wherein, the external transmission
bus is connected to each unit module, the unit module is the smallest independently operated intelligence control terminal module, and is the minimized independently operated all-digital program-controlled scheduling telephone switch. The unit module includes an external
bus adaptation interface, a program controlled processor, a timing
control circuit, a
data memory, a program memory, an analog telephone interface circuit, a man-
machine interface circuit, a special
signal tone circuit, and a sound recording circuit, wherein, the speech data between each telephone interface in the unit module adopts a digital time slot switch, and its
data format and signaling is compatible to the digital program-controlled telephone switch. The invention combines the superiority of
circuit switching and
soft switching, adopts an independently operated unit module to configure according to requirement, so that the invention has advantages of modularization, digitalization, non-bottlenecks, adapting to various transport protocols, low application cost, high
system reliability, good apparatus ductibility and so on.