Wireless monitoring system installation precautions
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First, the image quality
The quality of millions of high-definition webcams is just as important as an ordinary surveillance camera. As for the choice of standard definition or high definition, it should be decided by the owner or the customer. We only need to show the effect of the camera screen.
Second, network monitoring engineering audio features
According to the actual situation of the project, if you need to use millions of HD network cameras with audio capabilities, then you have to consider connecting headphones or speakers, microphones and other devices.
Third, the transmission environment <br> <br> wireless bridge is the use of microwave signals to transmit video signals, you must make sure the wireless bridge to transmit in clear view of the environment in order to ensure that wireless monitoring devices in the wireless monitoring system Stable transmission ensures the stability of the wireless monitoring system. Wireless bridge installation location should try to choose where the signal transmission is smooth.
Fourth, convergence layer switch selection
The number of single-end IPCs connected to the front-end switch does not exceed four, and 8-port 100-Mbit/s switches can be used. If more than four, please use 8-port Gigabit switches. The front-end switch to the main room of the equipment room is transmitted through network cable or optical fiber. Too many load IPCs are prone to packet loss, dropped frames, delays, and stalls;
Note: The switch used in building a wireless monitoring system must use a dedicated monitoring switch. It cannot use normal switches that transmit network signals for transmission.
Fifth, make the address record
Before the construction, the IP addresses of all network domes, network cameras, wireless bridges, NVRs, computer masters, storage servers, streaming media servers, high-definition decoders, and management servers in the system must be uniformly modified and registered. Pay attention to avoid IP address conflicts with existing devices (such as computers and network printers) on the local network.
Six, pay attention to IP address conflicts
All IP addresses of devices that access the wireless network must not conflict. For example, IP addresses of all network devices such as network cameras, wireless bridges, NVRs, and computers must not conflict, but they must be in the same LAN.
Seven, pay attention to network cable selection
The general Fast Ethernet switch uses Super Category 5 cable, and the Gigabit switch uses Category 6 cable. As for non-shielded or shielded, this is not very important, if the special requirements of the Party to be good, then the low-smoke halogen-free Category 6 shielded cable.
Eight, pay attention to the length of the cable
In the wireless monitoring system, the choice of the network is very important. In the high-definition wireless monitoring system, we try to choose six or more types of network cable to build a wireless monitoring system. There is a certain relationship between the transmission distance of the network cable and the length of the network cable from the POE to the wireless bridge. If the cable length is too long, the signal attenuation is too large. The length of the network cable from the network camera to the wireless bridge is generally within 90 meters, and the length of the network cable between the wireless bridge from the receiving end to the switch is also within 90 meters. If it is necessary to transmit a farther distance, it is recommended to use optical fiber for transmission.
Nine, core switches
The main switchboard of the equipment room must be a full-gigabit switch of the big brand, and it must not be fully loaded. For example, if a 24-port full-gigabit switch is actually used, it should not be used in excess of 20 ports, because the network HD video surveillance data volume is relatively large and it is not. Stopped transmission of data, the processing requirements of the switch is relatively high, if there is a phenomenon that delays and stalls occur when a switch has many points, you can try to solve it by adding a switch.
X. Wireless Bridge Selection 1. Operating Frequency The main frequency band of the wireless bridge is 2.4G and 5.8G. Two Ranges 2.4G Band Advantages: Diffractive penetrating ability, mainstream frequency band, good compatibility and disadvantages: vulnerable to signals in the same frequency band Interference, such as microwave oven, bluetooth or other electric appliances 5.8G frequency band Advantages: the frequency band is clean, not susceptible to interference, the transmission distance in wireless monitoring applications is much worse than 2.4G Disadvantages: diffraction penetration is slightly poor, easily absorbed by obstructions The signal knows the advantages and disadvantages of the frequency band, and then selects the appropriate frequency band in combination with the environmental characteristics of the application scenario.
2. The antenna is an indispensable accessory in the wireless monitoring system. Since the wireless signal is generated, the transmission and reception must be transmitted through this antenna. The antenna gain will also affect the transmission of the wireless bridge monitoring equipment. Distance and bandwidth.
Wireless monitoring installation and debugging are the same as wired network monitoring methods.
Outdoor wireless monitoring must pay attention to lightning protection measures.
Elevator wireless monitoring generally use 5.8G wireless bridge.