Promotion of a video alarm system, a fixed point of the monitored object emergency, snatches, security, fire alarm system, which means of communication are basically three ways: 1.1 wired communications: the front-end (live) alarm / control communications Host with alarm center through local public alarm transmission and other information; 1.2 wireless communication: that is the front end (live) alarm / control host communication between the alarm center through common station transmitting a fixed frequency (dot) delivery network alarms and other information; 1.3 Cable joint wireless communication: usually between field detector (infrared, door, gas detectors) and alarm control host communication using wireless communication (trigger) mode, and alarm control / communications host and network alarm center is still wired communications alarm transmission and other information (strictly speaking the first alarm means of communication is the same). 2, according to research, network alarm system is currently being operated by our (fixed-point surveillance targets) are used more than 99% of wired communications. Given the advanced development of this type of alarm system, because the constraints have been pre Technology degree and communication requirements, there are obvious skill deficiencies, an important manifestation of unity in alarm mode of information transmission network. There has to be a serious hazard, and even endanger the safe operation of the alarm system. The maximum risk is due to the laying of telephone lines shade of poor and vulnerable to destruction (natural and human factors), resulting in network paralysis and alarm failure. Thus, in recent years, the security industry has been looking for some kind of safer, more reliable, more efficient, more economical, more applicable network (alarm) information communication, and has launched a number of research tasks. 2.1 in accordance with the operational management of market demand form domestic burglar alarm equipment and existing alarm network, Welcoming Guang'an technology is the first to develop a video alarm system, the system in the conventional telephone network alarm system based on the increased upload videos live synchronization function, alarm the way traditional phone alarm, but also increase the group network communication methods are compatible: PSTN, GPRS, GSM, 3G, IP, etc. The main production cable access terminals are household, commercial, IP / PSTN / FM Power FM Networking infrared burglar alarm, wireless access has GSM / CDMA / 3G / GPRS wireless alarm center and supporting anti-theft alarm system. 2.2 data transmission based on GSM wireless networks safe, reliable, fast and low operating costs characteristics, using a wireless network (GPRS) will be sent to the alarm center network alarm or SMS alarm calls and sent to the user and to ensure that the alarm system The alert is still in the normal form, to avoid the omission of an accident. With continuously improve and perfect the system, we can show the use of the practice in a lot of strengths, especially in the upgrading of existing alarm network, have greater applicability and compatibility, can make full use of existing alarm system resources, thereby preventing waste and repeated short-term investments of resources. www.baojingxitong.com 18665853454