Anti-theft alarm wired and wireless resolution

The gap between the rich and the poor in modern society is very different. Thefts occur from time to time. To ensure the safety of home and company property, more and more anti-theft alarm systems are installed or the whole security system is installed. In the security system, anti-theft alarm is also for the prevention of alarm status, which is the core meaning of security. Therefore, the selection and installation of the anti-theft alarm system is very important. In addition, the alarm system in fact, in addition to anti-theft class there are dangerous warning categories, such as gas leaks, smoke sensors, water leaks, emergency assistance to protect the security to provide a full range of protection.

First, the alarm host work methods and characteristics

The alarm host is the heart of the front-end alarm system. It is used to receive timely feedback from the alarm signal sent by the detector; after the alarm host receives the alarm signal, it will generate a high-decibel sound, and will use the telecommunication network to transmit all kinds of police information to the alarm center. .

According to different signal transmission methods, the alarm host can be divided into wired alarm host and wireless alarm host. That is, after the detector detects an illegal intruder, the alarm signal is transmitted to the alarm host in two ways. The wireless detector transmits an alarm signal through a certain frequency of electromagnetic waves, and the wired detector can output or level the switching signal respectively. Signal output.

The wired alarm host is related to the wireless burglar alarm, and the alarm peripheral accessories and the host communicate in two ways: wireless and wired. The wired anti-theft alarm system is divided into sub-system anti-theft alarm and bus system anti-theft alarm. The split-line alarm host is a type of small-scale wired alarm system commonly used (1-16 close-range defense zones). The signals of alarm peripheral accessories are pulled back to the alarm host, the CK2300 series on the market, and CVC-O of China Taixun. The CVC-V series are split line alarm controllers. The bus system alarm host is a type of alarm host used in a large wired alarm system or a small wired alarm system that is not convenient for wiring. The communication mode is currently based on the mux bus (Bosch, Fox) and the 485 bus (Shenzhou Taixun, CVC). the Lord.

The wireless alarm host, so-called wireless, is an electronic product that uses the existing telephone network or GSM network to communicate with the owner's phone or mobile phone through a wireless or wired method to realize the remote anti-theft function. Deep Security Alarm adopts the United States imported original chips, microcomputer control technology, is an intelligent, all-digital, multi-functional new generation of security products that integrates sensor detection, communication, and computer control. By a programmable host, remote controller, various anti-theft, anti-robbery detectors, through a specific communication format and the public security 110 alarm monitoring center computer networking to form a set of advanced comprehensive and reliable security network. Once the alarm occurs, the alarm information can be instantaneously transmitted to the user-configured telephone, mobile phone, and pager through the post and telecommunications network. At the same time, the report to the alarm center, the network center computer through electronic maps, databases, computer voice prompts, monitor the situation on the scene, showing the occurrence of the police unit, location, location, timely mobilization of the police to make rapid processing!

Second, wired anti-theft and wireless security which is better?

What are the best choices for wireless and wireless devices? We may wish to analyze their respective deficiencies by comparison and make decisions.

The wired alarm host has the advantages of reliable communication, strong anti-interference ability, and high device cost, and is applicable to newly-built large-scale sites and fields and buildings hanging in the walls. Dedicated line, alarm signal transmission is relatively stable, and is not easily interfered by external factors. The stability of the detector power supply ensures that the system works more reliably. However, its poor mobility, inconvenience to meet the changing requirements of users and products, the maintenance and replacement of reserved cable is difficult and costly.

Wireless products can avoid the connection between the detector and the host affecting the interior decoration, with the advantages of flexibility, easy installation, and simplicity, but the wireless alarm has defects and fatal problems:

(I) Co-frequency interference: Due to the restrictions of the "Radio Committee", civilian wireless products are mostly "315MHZ and 433MHZ" frequency bands. When multiple wireless detectors are installed in the same household or several adjacent wireless alarm systems with “315MHZ and 433MHZ” in the same frequency band are installed, the same frequency interference will occur, one of them will be triggered, and the alarm host will not be able to receive signals from other detectors and remote controllers. If someone is active at home, and the detector is triggered, then neighbors want to use the remote control to “arm” or “disarm” or have criminals invade their neighbors. Although the detector “alarms”, the control panel will not respond. In another case, if the criminals are more professional and continue to trigger the built-in remote control or mask to send out interference signals, the wireless host will not receive the wireless detector alarm signal. The entire wireless alarm system is in an awkward state. This is wireless. The most fatal weaknesses of the alarm system, the more wireless alarm products are installed, the more severe these situations are.

(II) Wireless Shielding: Using “Electronic Wireless Shield” can shield the wireless signal, and the wireless alarm system is similarly paralyzed and cannot work normally.

(3) Critical signal: When the distance between the wireless detector and the wireless host is at the “signal critical point”, unstable conditions may occur when the host computer can sometimes receive the detector signal when the battery power is insufficient or the environment changes. , at this time will produce a missing report.

(D) battery power: When the battery is exhausted, it needs manual replacement, increasing maintenance costs; due to the professional debugging and maintenance of the alarm system, the average consumer is difficult to replace it on their own, to the use of inconvenience. Some manufacturers still do not have a reminder function because the technology is not in place. When the battery power is too low, there is no reminder function, or the reminding function is not paid attention to by the householder. As a result, a thieves cannot enter the wireless detector but can't report the alarm to the owner. In addition, due to battery power, the wireless alarm system can only use wireless infrared detectors with low power consumption and high false alarm rate. Nowadays, many companies have launched wireless dual-channel detectors with 220V power supply. Since they can deploy 220V lines, they can also use weak wires. This is not a true wireless alarm system, and it still cannot solve the interference problem.

Third, the difference between wired and wireless

(A) Anti-jamming capability, it is easy to cause false positives and false negatives due to high-frequency interference or other influences. Some wireless alarm products will cause an alarm at a distance of about one meter.

(B) Non-specialized installation, poor anti-vandalism. Almost all of the wired professional alarm consoles use a separate host and keyboard structure. The mainframe adopts a metal chassis and has a chassis tamper or integral tamper function. During the installation, the host generally recommends concealed installation. Only the keyboard is conspicuous and the keyboard has a tamper-proof function. This structure can better prevent intruders from destroying the host. Wireless alarm consoles are almost all integrated into the mainframe and keyboard (some without a keyboard). They are made of plastic and have attractive appearance. They are generally installed in a more prominent position. This structure is very vulnerable to intruders. And most wireless hosts use standard connector wiring, and intruders can stop the alarm simply by unplugging the telephone line**.

(3) The problem of the same frequency interference, which is the fatal weakness of the wireless alarm system. As long as the same remote control button is held down, the host system cannot receive the alarm information from the detector correctly because the same frequency interference can cause the entire system to malfunction. Invalid. For this problem, some manufacturers have adopted the method of interference identification and alarming. That is, when the host computer finds that there is continuous interference for a long time, it is considered that someone intentionally interferes with sending out the alarm. This method can solve the malicious interference problem to some extent. However, the time for identifying interference is generally more than 30 seconds. This time is enough to destroy the host.

(D) confidentiality issues, most of the current domestic wireless host 2226 remote control chip, code system for the 8-digit ternary total of more than 6,000 yards, the probability of high code is relatively high, especially for the large number of users in the community under the circumstances no doubt heavy code The probability is greatly increased. This code system is also very easy to use the code to crack. Security is also poor.

(5) Delay of triggering. In order to save power, almost all wireless detectors employ a trigger delay technique that is not triggered for a period of time after a trigger. This delay is usually 2-4 minutes. As long as it interferes with the first trigger, there will be enough time to destroy the host.

In summary, both wired and wireless have advantages and disadvantages. Now that wireless systems are a trend, most of them are wired alarms. Wireless alarms need to refuel in signal interference and distance transmission in order to occupy the market in the future. However, after the installation of the wired transmission, it is difficult to install the equipment. At present, the company has developed an invisible integrated wiring system that can be applied to various types of security products.