The Research And Development Of The Experimental System Of The SPC Exchange

With the rapid development of communication technology, the curriculum of the SPC exchange theory has become the basic core in the colleges as the most important knowledge in the field of communication. And most of this knowledge has to been transferred to the students by pratice, so we need a set of simulation of the SPC exchange.According to the theory of SPC exchange, we devise and develop an experimental system of automatic exchange to meet the need of teaching and practice. It is a minitype of PBX with an Single Chip Micyoco as the hardcore, it has four customer and one relay interfaces, a 16 X 16 exchange network, along with a keyboard as input and several LEDs as output. We can communicate within the local telephone exchange and also with the other phones in the other exchanger. It has the function of conference calling, manual exchange and PCM exchange etc.Based on the brief analysis of working state of the PBX, we set up a frame model of the software, and the main arithmetic which make up of this model are given. And then we recommend the technique of the software CAD. At last, we validate the software on the PBX controlled by SCM.