Design and realization of the small digital program controlled exchange 小型數(shù)字程控交換機(jī)的設(shè)計與實現(xiàn)
The telephone network based on circuit - switching and digital program controlled exchanging technology plays an important role in the whole communicating networks 以電路交換和數(shù)字程控交換技術(shù)為基礎(chǔ)的電話網(wǎng)更是在整個通信網(wǎng)中占據(jù)著重要的地位。
The text provides the detailed program flow , and completes the research and the hardware design of the digital program controlled exchange in local area network 本文給出了詳盡的設(shè)計流程。本文完成了數(shù)字交換機(jī)在局域網(wǎng)內(nèi)功能的研究,并完成了硬件電路的設(shè)計與實現(xiàn),達(dá)到了設(shè)計目的。
The text firstly introduces the status of the program controlled exchange , and compares simulative exchange with digital exchange in the performance , and points out the developing direction of the future digital exchange 本文結(jié)合課題首先介紹了程控交換機(jī)的發(fā)展?fàn)顩r,對模擬交換機(jī)和數(shù)字交換機(jī)進(jìn)行了性能比較,并指出未來數(shù)字交換機(jī)的發(fā)展方向。
The difficulties of the text are the use of the integrated dtmf receiver mt8870 and the signal generator circuit . their realities need occupy the pcm timeslots . they are the characters of the digital program controlled exchange 尤其對于收號器mt8870的使用、信號音的產(chǎn)生電路是本設(shè)計的難點,具有數(shù)字程控交換的特點,需要占用pcm時隙來完成其功能。