Interoffice CENTREX Construction Based On ZXJ10Digital SPC Switch

Nowadays, the communication industry develops increasingly fast with the rapid development of science and the arrival of4G communication era. More and more new techmologies, meterials and businesses come into our lives. On the other hand, the competition among the telecom operators are getting exceedingly intense. As a result, they are mow faced with a tough situation. It is a significant problem how to reduce the investment of human and financial resource, and at the same time, to hang on to the exclusive clienteles, based on the existing web. To solve this problem appears the CENTRX virtual network technology based on the existing program-controlled digital switch.CENTRX virtual network technology is a new communication business that provided by the Network management department of operators, controlled and implemented by the digital SPC switch communication. It is also called "centralized user switches"or "virtual PBX"in Chinese. Unlike the general PBX, it doesn’t need neither any hardware devices nor extra space. All the hardware is provided by operator’s digital SPC switch. In other words, CENTREX business is actually a kind of rent mode that the operators share the powerful Comprehensive digital SPC with users, and furthernore, can be used without the complex procedures such as rent and warrant. It brings great convinience and benifits to the users that they save the expenses of the devices, employment, training and maintaining, and also get the telecommunication service in need. What’s equally important, it’s a win-win choice in a real sence for the operators that they hang on the exclusive clienteles and increase the efficiency of resource use utilization.The original CENTRX service emerged in America. AT&T used CENTRX virtual network technology in5ESS switch for the first time in1985. Now there are thousands CENTREX in America with9million user lines. It is not until1992when this technology was popularised in the international market that it was used all ove the world. Now being a pricipal means of the revenue, it is used widely in most companies and in our daily life.This essay mainyl tells the building of the part CENTRX based on ZXJ10digital switchs, analizes in detail the implement of the vitual net in the same bureau and across groups, and finally applies these thchnologies to build the virtual net in Huayuan drugstore in Fushun. The SS7tracking is carried out through the ZXJ10bureau digital SPC switch’s own functions. The implement of the group formation functioncan is verified by the perspective of SS7.In the defination of the WAN CENTREX user group data by ZXJ10, the8-bit-long number owned by the users can be transfered into3to8-bit-long virtual number. The problem of the connection between virtual users’number and public network number can be solved through dialing9out of way. Thus, it put an end to the phnomenon that some users need public service and some need not. In the light of the character the exchanging network in Fushun has two Core switching bureau, this eaasy puts the virtual number in the way of marking special identification like "111"and sets the corresponding analizing element in the other switch, reaching the goal of customers in the same group mutual dialing among different offices. And the implement of functionality of the virtual group is verified through the dial testing, tracking and monitoring the SS7mode.The advantages of CENTRX virtual network technology are flexible networking, safe and reliable communications, saving cost and not needing other devices. It also overcomes the drawback that traditional way need large initial investment and excludes users’ individual number favoritism increasing the utilization efficiency of switch resource. Meanwhile, CENTRX virtual network technology that applys in ZXJ10digital SPC switch can overcome traditional analog switch unstable cummuciation quality, and can adapt to optical transmission insert such as OLT, ONU, etc, and to integration of three networks that needed by IP commuciation. The application of CENTRX virtual network technology meets the requirements of "user is supreme, wide choices market". It also has widely development future.