In recent years, with the continuous development of the high-definition era, people are constantly pursuing a clearer and faster visual experience. However, in wireless surveillance systems, the transmission of higher definition video images must be supported by a higher bandwidth wireless bridge. If your wireless video transmission device cannot meet the needs of high-definition transmission, it will cause delay in the wireless monitoring system. The delay of the wireless monitoring system is often the most worrying problem for most customers. The greater the delay, the more fluency of the wireless monitoring system will affect the video image of the transmission, and even the video image sometimes does not. However, many customers blame the delay on the wireless bridge. In fact, we have to find the reason not only from the wireless bridge, but also from the various aspects of the system. This section of Shenzhen Lai'an Technology Xiaobian to introduce in detail the six major factors that cause delays in the wireless monitoring system:
1, the impact of wireless bridge performance
Usually, when there is a delay in the wireless monitoring system, we need to check whether the wireless bridge itself has a delay. For some low-end products on the market, the net bandwidth cannot meet the requirements of high-definition video transmission, which will result in a large delay in transmitting video signals. Moreover, its CPU processing performance, matching system speed, antenna quality, etc. can seriously affect the transmission speed. Therefore, when we choose a wireless bridge, we must choose a wireless network with sufficient bandwidth, good chip processing capability, and sufficient gain. Bridge, in order to ensure that you have no worries in the use of wireless monitoring systems.
It is recommended to use the LA-5839 long-distance outdoor wireless bridge produced by Shenzhen Lai'an Technology. The wireless bridge uses the Qualcomm AR7240+AR9280 wireless solution to adapt to normal operation in high temperature and low temperature environments. The dual-channel output power is 800MW. The antenna uses a built-in 5.8G and 18dbi dual-polarized MIMO antenna (horizontal/vertical 16 degrees). The point-to-point signal is stably transmitted for 8 kilometers, the net bandwidth is about 90M, and the point-to-multipoint signal transmission is 7 kilometers.
2. Impact of network performance of wireless monitoring system
As we all know, the wireless monitoring system is divided into five types of network cables, five types of network cables, and six types of network cables. Previously, five types of network cables were used for transmission in standard definition systems to fully meet the demand. In the high-definition wireless monitoring system, we need to use the super five network cable and the super six network cable to achieve image transmission. The super five network cable supports the 100m ultra-six network cable to support 500m bandwidth.
However, we must pay attention not only to the choice of cable type, but also the length of the cable. The length of the cable from POE to the wireless bridge should not exceed 30 meters. If it is too long, the signal attenuation is too large. The length of the network cable between the network camera and the wireless bridge is generally within 90 meters, and the length of the network cable between the wireless bridge of the receiving end and the switch is also within 90 meters. If it is necessary to transmit a longer distance, it is recommended to use optical fiber for transmission.
3, the impact of front-end camera performance
In the wireless monitoring system, the choice of the camera is also very important. The CPU processing capability of the surveillance camera or the speed of monitoring the overall system response of the camera is insufficient, which may result in delay. Therefore, in the case of a fixed bandwidth, it is necessary to transmit a 1080P/60-frame high-definition video to require a special video processing chip to improve the compression ratio of the video encoding, thereby effectively reducing the volume of data to be transmitted and reducing the delay.
4, the impact of switch performance
In wireless monitoring systems, switches are often easily overlooked by users. Many people think that switches only forward packets, and do not need any processing on the packets. The performance of the switches is not so important. In fact, this idea is wrong. If you transmit network signals, because the network itself does not have large bandwidth for downloading and downloading, most switches can meet your needs. In the wireless monitoring system, the bandwidth of the video image transmitted by the wireless monitoring system is relatively large. If the switch you use does not meet the transmission requirements, the switch will have insufficient processing power. It is prone to delays, dropped packets, etc.
Therefore, when we choose a switch, we must determine the total bandwidth of the data collected by your front end, and then choose the switch that suits you according to the backplane bandwidth of the switch and the forwarding rate of the packet. At present, there are many kinds of switches on the market, which are used for civil and industrial use. Therefore, when purchasing a switch, you should not choose to use a dedicated switch to build a wireless monitoring system.
5, the impact of network DVR performance
The network hard disk recorder not only stores video for the transmitted video image, but also decodes the video signal of the front end. The decoder's decoding speed is insufficient, which will cause the wireless monitoring system to delay. Although the decoder does not account for a large percentage of the delay problem, we cannot ignore its impact. However, when you choose a network hard disk recorder, you must match the front camera and wireless bridge. For details, you can consult Shenzhen Lai'an sales staff.
6, the impact of the number of transits in the wireless monitoring system
When the wireless monitoring system is built, the wireless monitoring system must ensure the stable transmission of the signal in an unobstructed environment. If the transmitter and the receiver are occluded, the wireless monitoring system will be delayed, resulting in unstable video images. In this case, we will use the relay to avoid the obstruction. However, the more the number of jumps, the more loss the wireless monitoring system will have and the greater the delay.
Therefore, when you design the wireless monitoring solution in the early stage, you must choose the position of the transmitting end and the receiving end. If the height is high, the two ends should be raised as high as possible to avoid the obstruction. The choice of relay is only the next best policy.
If there is no way to reduce the number of transfers, we can choose some devices with less loss during the jump process. It is recommended to use the mesh wireless bridge with less jumps produced by Shenzhen Laian Technology, which is often used for more jump nodes. Among the MESH networks.
The LA-8000DHC is a self-organizing wireless MESH network product with a Mini-PCI high-power wireless network card. It is widely used in mobile network data transmission such as UAV map transmission, individual equipment, cruise ship, rail transit, railway, emergency command, driving school subject 2, subject 3, mine transportation, patrol detection, factory mobile transportation, etc. , multi-path connectivity, intelligent path learning and other functions, can provide high-bandwidth, low-latency data roaming services in high-speed mobile environments.
Shenzhen Laian Technology Co., Ltd. is a professional wireless monitoring system service provider. We can provide you with a set of low-latency wireless monitoring system solutions. We can also provide free trial services to provide users with free field testing.
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