| Along with the rapid development of communications technology, the construction and development of our country's communication network is growing larger and larger. To ensuring communication network work well, the perfect singling mode is necessary besides the switch devices and Transmission Equipments. Sometimes we call the singling mode as singling system, it is one kind of communication language for access control between users'telephone and switch or one switch with other switches. The singling system is one success factor for completing successful call between any subscribers and working well of communicating network.Now, SS7 and PRI Singling are the most use in our country.Associate with the digital switchboard type JSQ-31NT, version V6.03 in YANTAI DONGFANG ELECTRONICS INFORMATION INDUSTRY CO.,LTD,We introduce The Design And Implement Of PCM30 digital trunks hardware and software.This note is intended to show simply the total project design of PCM Digital Trunk and the structure of its hardware. Thies note will show, in particular, the software approach of the PCM Digital Trunk on CPU card, and the software approach of digital singlings combining with the introduction of SS7. The system, programmed by PLM51 language, fulfils the function of link managemend, routing analysis and so on, at the same time, supports the TUP protocol and/or ISUP protocol of NO.7 Singling and 30B+D singling(PRI Singling). The system can be used widely at networking of telcommucation and/or trandem pbx.In addition, this note shows the practical application of PCM Digital Trunk System combining with practical case. |
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