1. The development status of anti-theft alarm system
The anti-theft alarm system is the most important part of the entire security system. When there is an illegal intrusion or an emergency such as a gas leak, a fire, an acute illness of the elderly, etc., the alarm is detected by various detectors installed in the room, the anti-theft alarm generates an alarm, and the alarm center will obtain the alarm information within a few seconds. To this end, security or ambulance personnel were quickly dispatched to the police scene for handling.
As the most important part of the security system, the anti-theft alarm system uses fully automatic anti-theft electronic equipment to determine illegal intrusions through infrared detection technology and various magnetic switches in unattended places, and sensors detect gas leaks. The alarm is made on the spot through a horn or a warning light, and the alarm information is transmitted to the alarm center or the owner himself through the telephone network. At the same time, when someone indoors in an emergency situation, they can also send emergency help messages to the networking center and the owner through various wired or wireless emergency buttons or keyboards.
Common anti-theft alarm systems include detectors, alarm controllers, siren, warning lights, and alarm centers.
With the rapid development of the Internet, mobile alarm terminals, smart phones and tablet computers, etc. have also emerged, which cooperate with APP applications to realize mobile alarm management.
2. Networking method of traditional anti-theft alarm system
The traditional network composition of anti-theft alarm host and alarm center is usually divided into: wired telephone network PSTN, wireless mobile dial-up communication network GSM, wired IP network communication mode and wireless data communication network GPRS.
Let's first understand some of the advantages and disadvantages of traditional communication methods:
The advantages of PSTN: The main advantage of online telephone reporting is that the coverage area is relatively wide and the user group is relatively large. Disadvantages: The traditional telephone alarm network system has some problems. The alarm communication speed is slow, and the time required is as long as tens of seconds. When concurrent reporting, the line is easily blocked, which has a great impact on the timeliness of the alarm; it has a great impact on the communication link The state cannot be detected well, and the telephone line cannot be detected in time when the telephone line is broken or damaged, so that the police cannot be reported in time; compared with the network communication method, the telephone alarm cost is relatively high; most traditional anti-theft alarm systems through PSTN It is impossible or inconvenient to disarm and arm the front-end equipment, and it is impossible to query the working status of the front-end equipment in real time. It is not easy to manage the centralized system; and with the transformation of traditional telephone lines, many problems such as unstable transmission have been brought about.
Advantages of wireless GSM dial-up: Compared with PSTN, the networking form is not restricted by the physical connection form; Disadvantages: dial-up reporting delay is high, concurrency is poor, the device status cannot be reversed, and it is affected by base station signal coverage. The application cost is relatively high.
Advantages of wireless GPRS network: It solves all the problems encountered in traditional telephone dialing methods (PSTN and GSM). The low cost of network communication makes it possible to perform 24-hour heartbeat detection on line status, and perform back control (disarming, disarming, canceling alarms, bypassing, etc.), querying host status and other operations, which facilitates a large range of TCP/IP network management. Easy to counter-control (disarming, disarming, disarming, bypassing, etc.), facilitating status query; for transmitting small alarm data information, it can satisfy a large number of alarm reports without blocking. It is easy to manage a large range of TCP/IP network. Disadvantages: However, due to the influence of the coverage of the signal base station, in many cases the wireless communication network has a slow transmission rate. It is still possible to transmit only some alarms, but it is impossible to transmit the video stream at all.
The advantages of wired IP network: it integrates the advantages of PSTN/GSM dial-up network and wireless GPRS communication methods, and has fast transmission rate, strong timeliness, 24-hour heartbeat detection, data encryption protection and other advantages. It can not only transmit alarm information, equipment status, etc., but also transmit information such as pictures and video streams. While reporting the police situation, upload some pictures or videos of the on-site incident process, and realize the picture or video review of the police situation on the mobile terminal or the alarm terminal, and the authenticity of the police situation on the spot can be judged in the first time, and the efficiency of police handling can be improved. Disadvantages: Limited to wired network deployment and on-site. In contrast, with the development of the Internet and the popularity of the network, the wired network has a very high regional coverage. However, some remote areas may require rapid deployment. Wired networks are also difficult to cover.
On the whole, the four communication methods of wired IP network, PSTN, GSM, and GPRS each have their own strengths. So, is there a better networking communication method that can be applied to anti-theft alarms?
3. Application of 3G/4G communication technology
In response to the question in the previous section, is there a better way of networking and communication? The answer is yes. With the advent of the Internet era, mobile operators have built a lot of base stations with high 3G/4G signal coverage. It not only has the advantages of a wired IP network, but also is easy to deploy quickly. Cooperate with mobile intelligent terminal equipment to realize system-level and convenient mobile services in the true sense, with low networking costs and easy and rapid deployment of networking management.
With the innovation and evolution of mobile Internet technology, 3G/4G mobile communication technology is widely used, which can transmit data such as audio, video and images quickly and with high quality. It can transmit at several Mbps, 25 times faster than the current home broadband ADSL (4M), and can meet almost all users' requirements for wireless services. In addition, 3G/4G can be deployed where DSL and cable modems are not covered, and then expanded to the entire region. Obviously, 4G has incomparable advantages.
