Many friends in the surveillance industry, especially those who have just entered the industry, have encountered some monitoring problems and have been confused. The following article shares the basics of monitoring and interpretation.
Teach you to understand the basic knowledge of security monitoring
What are the classifications of PTZ and their functions?
A: There are indoor and outdoor points, the main role of indoor protective cover is dust; and the outdoor protective cover in addition to dust, the more important role is to protect the camera in a more hostile natural environment (such as rain, snow, low temperature, high temperature, etc. ) Work under. This not only requires a strict sealing structure, but also has a wiper, shower device, etc., as well as a function of temperature increase and temperature decrease. This determined that the price of the outdoor protective cover is much higher than the indoor protective cover. When selecting the protective cover, it should also be noted that the nominal size of the protective cover is the same as the nominal size of the camera. If it is difficult to be consistent, a large size protective cover can be used with a small size camera;
What is the bracket and classification of the camera?
Answer: The parts used to fix the camera are wall-mounted, suspended, and other types. The choice of bracket is relatively simple, as long as its load capacity is greater than the total weight of the equipment installed on it, otherwise it will easily cause the bracket deformation, pan and tilt when the rotation, affect the monitoring image quality
What is a cloud mirror control decoder?
A: The decoder is a device that converts the control signal sent from the front end to a voltage signal to control the pan/tilt and the lens.
What is a coaxial cable?
A: The name of COARIAL CABLE is related to its structure. Coaxial cable is also one of the most common transmission media in surveillance. The pair of conductors it uses to transmit information is selected according to a layer of a cylindrical outer conductor set outside the inner conductor (a fine core) and the two conductors are isolated from each other by an insulating material. The outer conductor is The center axis of the center axis is on the same axis, so it is called a coaxial cable and the impedance is 75 ohms. The reason why the coaxial cable is designed in this way is to prevent the transmission of an abnormal signal due to external electromagnetic interference.
What is the transmission distance of the coaxial cable?
A: According to the basic requirements of China's PAL-D video distortion, the transmission line without compensation transmission distance measured values ​​are: 75-7 coaxial cable is about 200-250m, 75-5 is about 100-150m.
What are the specifications of coaxial cable?
A: The domestic coaxial cable has SYV75-3, SYV75-5, SYV75-7, SYV75-9 and other specifications
What is twisted pair transmission?
A: Twisted Pairwire (TP: TwistedPairwire) is the most commonly used transmission medium in integrated wiring projects. The twisted pair consists of two copper conductors with an insulating protective layer. Twisting two insulated copper conductors at a certain density can reduce the degree of signal interference, and the electric wave radiated by each conductor during transmission can be cancelled by the electric wave emitted from the other conductor. Twisted pair generally consists of two 22-26 insulated copper conductors. The characteristic impedance is about 100Ω, and the distributed capacitance is about 15pF/m. Different from the coaxial cable, the signal is transmitted in a balanced manner in the twisted pair. With the use of twisted pair video transmission equipment and twisted pair, it can be guaranteed. High-quality video signals can be transmitted within a distance of 1.5Km.
What is IP video surveillance?
A: IP is the abbreviation for Internet Protocol. It is one of the most commonly used protocols for communicating over computer networks. IP monitoring solution is to transmit video information in digital form through wired or wireless IP network. As long as the network is reachable, video monitoring and recording can be realized, and this monitoring can also be perfectly combined with many other types of systems.
What is a video amplifier?
A: Video amplifier When the video transmission distance is relatively long, it is better to use a video line with a thicker wire diameter, and at the same time, the signal amplifier can be increased in the line to enhance the signal strength to achieve long-distance transmission. Video amplifiers can enhance the video's brightness, chroma, and synchronization signals, but intra-line interference signals can also be amplified. In addition, too many video amplifiers cannot be connected in series in the loop, otherwise saturation may occur, resulting in image distortion.
What is the RS-232 serial interface standard?
A: RS-232 is the most widely used serial interface in the PC and communications industries. RS-232 is defined as a single-ended standard that increases the communication distance in low-rate serial communications. RS-232 adopts unbalanced transmission, so-called single-ended communication.
What is the RS-422 interface standard?
A: RS-422, RS-485, data signals using differential transmission, also known as balanced transmission. The full name of the RS-422 standard is "Electrical Characteristics of a Balanced Voltage Digital Interface Circuit", which defines the characteristics of the interface circuit. RS-422 four-wire interface. There is actually a signal ground, a total of 5 lines. The maximum transmission distance is 4000 feet (about 1219 meters) and the maximum transmission rate is 10Mb/s. The length of the balanced twisted pair is inversely proportional to the transmission rate. Below 100 kb/s, it is possible to reach the maximum transmission distance. The highest rate transmission can only be achieved at a short distance. The maximum transmission rate that can be obtained on a typical 100-meter long twisted pair is only 1 Mb/s. RS-422 requires a terminating resistor and requires its resistance to be approximately equal to the characteristic impedance of the transmission cable. In the moment distance transmission, no termination resistor is needed, that is, the termination resistor is generally no longer than 300 meters. The termination resistor is connected to the farthest end of the transmission cable.
What is the RS-485 interface standard?
A: RS-485 is based on RS-422, so many RS-485 electrical specifications are similar to RS-422. If you use balanced transmission methods, you need to connect termination resistors on the transmission line. RS-485 can use two-wire and four-wire, two-wire system can achieve real multi-point two-way communication. RS-485 differs from RS-422 in that its common-mode output voltage is different, RS-485 is between -7V and +12V, RS-422 is between -7V and +7V, RS-485 receiver The minimum input impedance is 12k ohms, and RS-422 is 4k ohms; RS-485 satisfies all RS-422 specifications, so RS-485 drivers can be used in RS-422 networks.
What are the similarities and differences between RS-422 and RS-485?
A: RS-422, RS-485, data signals using differential transmission, also known as balanced transmission. RS-422 four-wire interface. There is actually a signal ground, a total of 5 lines.
RS-485 adopts two-wire mode and two-wire system can realize true multi-point two-way communication. The difference between RS-485 and RS-422 is that the common-mode output voltage is different.
What is a video switcher?
A: The video switcher is a key device on the main console in the control center. It is a device that selects video image signals. Simply put, several video signals are input, and by controlling them, one of the video signals is output. In a television monitoring system composed of multiple cameras, it is generally not necessary to display the image signals of each camera in a one-to-one correspondence with the same number of cameras as the number of cameras.
What is a split controller?
A: Using image compression and digitization methods, several pictures are compressed in the same proportion on the screen of a monitor. Some also have a built-in sequence switcher function, which can display the full-screen images of each camera input in turn on the monitor in the order and interval time (as if the host switches the screen in turn), and can use the video recorder according to the above The sequence and time interval are recorded. The interval time is generally adjustable. With sequence switching, picture-in-picture, multi-picture output display playback video, interconnected camera alarm display, touch-type pause screen, alarm recording playback, time, date, title display and other functions.
What is a video distributor? VDA (VideoDistruiutingAmplifier)
A: A splitter is the most commonly used component of a distribution network in a cable television transmission system and is used to distribute signal components. Its function is to equally divide one input signal into several outputs, usually two distributions, three distributions, four distributions, six distributions, and so on.
What is video switching control?
Answer: The central processing module of the matrix system controls the video switching of all camera inputs and monitor outputs. The switching can be controlled by the operation of the keyboard, the execution of the system switching queue, or the automatic response function of the alarm.
What are the system switching methods of the matrix system?
A: Matrix system switching can be divided into free switching, program switching, synchronous switching, group switching, and alarm switching.
What is the free switching of the matrix system?
A: A free switching queue is to program a group of camera inputs to be displayed on a monitor. Each camera screen can stay at different times and each monitor has an independent switching queue.
What is the program switching of the matrix system?
A: Multiple queues can be run on any monitor by the operator or by a timer call at any time. Each group of switching queues can consist of multiple cameras and their presets, dwell time, and auxiliary switch actions. In a group of switching, multiple auxiliary actions of the same camera picture or one camera may occur multiple times.
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