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How to quickly locate which device or wire has a problem?
First of all:
In terms of construction material selection, we will use the national standard network cable and strong tensile cable. Nowadays, there are many kinds of network cables on the market. I use the common network cables in the market as an example to illustrate one by one:
1) Copper clad steel cable: Its resistance is about 75-100 ohms in 100 meters! This network cable is also the cheapest network cable on the market, and the effect of resistive water communication is not very good!
2) Copper clad aluminum network cable: Its resistance is 100 meters is about 24-28 ohms! This kind of network cable is relatively easy to sell in the market, because it is cheap, and the communication distance and effect are good, but his service life is not very long, because his poor oxidation resistance!
3) Copper-clad silver cable: Copper-clad silver cable is also called high-conductivity aluminum cable. The material is purer than copper-clad aluminum. Its resistance is about 100 meters and 15 ohms. This kind of cable is a new type of cable and its price is not expensive. Distance is more than tens of meters away from copper clad aluminum cable, but its deficiency is the same as copper clad aluminum cable. The service life is not long, the same weakness, poor oxidation resistance! It is nice to say that the copper-wrapped silver cable is a copper-clad aluminum cable, but its cost is more than tens of dollars more expensive than the copper-clad aluminum. Of course, his performance is also unmatched by the copper-clad aluminum cable. of!
4) copper clad copper cable: This cable resistance is not small, 100 meters resistance is about 42 ohms, the general performance of the Internet, but he is strong antioxidant, and life is much longer than the copper clad aluminum!
5) Oxygen-free copper network cable: Oxygen-free copper network cable resistance is the smallest, 100 meters resistance is about 9.5 ohms, this cable is the best cable in the market today! The best quality cable! Small resistance, long transmission distance, high speed and long service life!
Basically, now the market is based on the above five kinds of material network cable, the other is not to say for the time being, hoping to promote and learn from each other!
The above is the selection of materials, if the quality of the used wire passes. Camera problems, it can be ruled out directly. The following describes how to detect the cause of the fault. Look at the picture: 
The small and medium-sized webcam project has only one switch and one router. Under a simple replacement, the problem is known. Large and medium-sized webcam layouts, replacement methods are not so good. Pictured: 
For example, in a large webcam layout we can use a command to detect that is the TRACERT command. Look at the picture: 
Take a laptop to access the network camera system equipment (switches, routers can), change the IP and webcam an address segment. After the change, use the native commad tool to detect if the local IP address has been changed successfully. 
After the change is successful, we will use the software that comes with the webcam to find the failed camera IP address. 
For example, we found that the faulty IP address is: 113.128.192.29 (for example, the fault camera IP address is 113.128.192.29)
Use the commad tool to enter the following command: TRACERT-d113.128.192.29 Return information Use the command TRACERT 113.128.192.29 Return information The returned information is 13 (describe our notebook to the camera with 13 devices in the middle), obviously the first one The IP address is the device that you access. The connection time is less than 1MS. The 9th and 12th bars show that the return time is timeout. This indicates that the problem is likely to occur on both devices. However, we only have an IP address and it is difficult to determine which device is the IP address. Let's use the nbtstat-a command to figure out the device layer by layer. 
The MAC is the hardware address of the device we found. If we put the device hardware address on the device before construction, the maintenance will save a lot of time.
Each port of the switch has a MAC, but only one reference MAC. The other port addresses generate a continuous MAC based on the entire port. We use the command to find the reference MAC. The VLAN and Hub are no longer introduced one by one. We can find out for ourselves
Next we can use the notebook directly to confirm that the device is the one we are looking for. This time we use the arp-a command to confirm. 
The entire command can only find the MAC of the port to which you are connected (the technique is here, the device has a reference MAC, but other ports are generated continuously based on the entire MAC, so as long as we use arp-a found Just like the first few digits that were found using nbtstat-a, it means that we did not find the wrong device.)
We know which device has a high failure rate and replace the device we have brought to see if the problem is solved.
The command uses tarcerttarcert-a to find the IP address of the faulty device. The nbtstat-a command is to find the physical hardware address. The arp-a command is to confirm the command of the device. The ipconfig command is used to check if the local IP has changed successfully. The ping command is suitable for simple webcam failure detection.
How to solve large and medium-sized network monitoring network failure?
Large and medium-sized IPCs have problems such as camera delays, frequent video dropouts, and problems every few days.