Indoor wireless monitoring freezes and disconnects: causes, solutions and solutions
In indoor surveillance scenarios, many people choose wireless networks with wireless cameras because they have the advantages of no wiring, easy installation, and flexible deployment, which can effectively reduce the difficulty and cost of construction. However, if used improperly, it is easy to cause screen distortion, freezing, disconnection, etc., resulting in the monitoring network not being able to operate normally. The following will analyze the relevant problems in detail and provide solutions.
1. Typical cases
Excessive camera delay: A company used a wireless AC+AP to build a surveillance network. A large number of cameras were connected to two APs, resulting in large wireless delay and video loss.
Weak signal caused by wall penetration: A teaching building added surveillance cameras. Some cameras in the classroom were connected to the corridor AP through the wall. The signal attenuation was serious, and the picture was disconnected and distorted.
Internet surveillance sharing problem: The restaurant's guest WiFi is shared with the surveillance WiFi, and there are too many cameras connected, resulting in severe disconnection and worsening lag during peak hours.
2. Causes of lag
Video is composed of continuous images. Abnormal image transmission will cause screen distortion, lag, and even video streaming disconnection. The root cause is that the network transmission bandwidth cannot meet the video streaming requirements. Interference, competition, signal attenuation and other factors in the actual environment make the available bandwidth insufficient.
Mobile phones mainly use downlink traffic, which is short-lived and highly tolerant to delays. However, cameras need to upload video streams in real time, which requires high stability and bandwidth. Therefore, under the same signal, the mobile phone works normally but the camera freezes.
3. Solutions
1. Avoid stacking cameras
A large number of cameras connected to one AP will lead to fierce transmission competition. Suggestions are as follows:
A wireless router/AP can connect no more than 5 external antenna cameras;
If the number of cameras exceeds the limit, add a wireless router for wired bridging;
In a multi-AP network, set different monitoring SSIDs for the AP to disperse the cameras.
2. Deal with signal attenuation
Obstacles such as walls will cause signal attenuation. It is recommended that built-in antenna cameras do not pass through walls, and external antenna cameras can only pass through one wall at most.
If you must pass through a wall, you can replace it with an external antenna camera, connect it by wire, or install an AP in the room. You can also consider cascading wireless cameras, but they must be used with wireless NVRs, which has certain limitations.
3. Separate Internet access and monitoring networks
Internet access and monitoring of shared networks can easily lead to resource occupation. The following are the solutions:
You can use two wireless routers to monitor the Internet separately;
When using a single router, turn on multi-band integration to guide mobile phones to connect to 5G signals;
When using an AC+AP network, set spectrum navigation to guide mobile phones to connect to the 5G band and limit the number of accesses.
4. Reduce wireless interference
2.4G signal interference is large, so the channels should be planned reasonably.
In an AC+AP network, isolate the adjacent AP channels, such as 1-6-11.
In a router-dense environment, use software to detect channels with less interference and set the router; set the WiFi band width to 20MHz to reduce interference.
IV. Indoor surveillance solution
1. AC+AP access solution
AC+AP networking and unified management can achieve full wireless coverage, optimize the network to ensure stable surveillance return.
2. Router cascading solution
If there is a wireless router and there are many cameras scattered, you can cascade the routers by wire, which is low-cost, easy to implement, and can ensure network stability.
3. Cascade Wired IPC Solution
If wireless cannot meet the transmission requirements in complex indoor environments, a wired solution can be used. Cascading cameras can reduce wiring and power supply costs. Some cameras that support cascading can be connected in series through one network cable to save costs.
V. Summary
Network monitoring has high network requirements, and wireless transmission has advantages and disadvantages. As long as reasonable planning is made, a stable wireless monitoring network can be built.