Security has IT to easily solve the monitoring system which network soft issues!

Now talking about the monitoring system, if it still stays in the traditional analog era, it is really a bit behind. The era of IPC network high-definition monitoring has come. From product manufacturers to product sales service providers to engineering companies and even end users, we should understand the changes in the original ideas. Now is the age of the Internet. Didn't you look at the old IT companies around and around, turning into a security monitoring company?

It is said that the security door frame is low, but in fact it is mainly mature technology.

Remembering that a few years ago, when it comes to monitoring cameras, it feels very deep and the system is very complicated. Why did that happen? The popularity is not enough, then professional people are less.

In the last year or two, the arrival of the era of network monitoring has resulted in the achievement of a large number of small and medium IT companies. Why? In theory, the network camera is a small terminal. The transmission line is still hand-to-hand. The computer software is also a strength for the IT computer company, so it naturally becomes a market.

And many people also saw that the security market has become more and more IT. Traditional security has been marginalized and is gradually shifting toward system integration. People are getting more and more involved in the network, and the camera system is only a small part of the entire system.

Based on this, a lot of IT companies have transformed into security system integrators. If you say that the threshold, in fact, we find that the threshold is getting higher and higher. Why? Products are homogenized, and system services are different, showing different levels of technology. Especially in the large and medium-sized network monitoring system, the technical strength is reflected more vividly.

A number of phenomena and commonly used test methods on common soft issues in network monitoring systems have been compiled online today. For everyone to learn and discuss, and for reference. Inadequacies, but also a lot of advice.

In fact, in large and medium-sized network monitoring, the most likely to occur is a series of video signal soft issues related to the delay of the camera image, the black screen of the motionless image dropping, and the problem that sometimes occurs every few days.

In fact, the above situation is nothing more than the reason for the transmission device and cable.

Which is the reason for locating the device or the cable?

First of all: Iron has to be hard. Select from the cable to work hard. The effectiveness of a security monitoring system, the cable accounted for a large part of the reason. The effects of pure copper and alloyed copper are very different. In fact, many times, a project really does not care about the cost of cables that cost several tens of dollars. Those who have suffered losses are stealing music. Haha.

In the selection of materials for construction, the national standard network cable and the cable with strong tensile strength should be used as much as possible. There are many kinds of cables on the market. You can't think of no manufacturers, haha:

1) Copper clad steel cable: Its resistance is about 75-100 ohms in 100 meters! This kind of network cable is also the cheapest network cable on the market, and the resistance and communication effects are not very good! Commonly known as wire, haha. A lot of network lines do this, 4 pairs inside, 2 pairs good, 2 pairs of times. Know that you use 1236; not 4578; but if one day you suddenly want to use POE power supply? No tears, haha!

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 the 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 Internet performance in general, but he is strong antioxidant, and life is much longer than 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.

(If this doesn't set up, I think you're going to do it, huh, huh)

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: 192.168.1.99 (for example, the fault camera IP address is 192.168.1.99)

Use the commad tool to enter the following command: TRACERT-d 192.168.1.99 Return information

Use the command TRACERT TRACERT to return information

The returned information is 8 (indicating that there are 4 devices in the middle of our laptop to the camera). It is obvious that the first IP address is the device you access. The connection time is less than 1MS, and the 7th and 8th bars show the return time. A timeout 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 laptop 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 above mentioned 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 The same as the first few digits 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 tarcert tarcert -a to find the location of the IP address of the faulty device, nbtstat-a command to find the physical hardware address, and arp-a command to confirm the command of this 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.