Video conferencing is no longer a fetish for the general public, and has now entered the office products in business life. As a new type of communication tool, video conferencing, with its "immersive" visual remote communication method, has shown a good development trend in recent years. Nowadays, the technology and application of video conferencing have become more and more mature, and video conferencing has gradually become the “standard configuration†of major enterprises and institutions, and gradually extended to a wider field. Although video conferencing has been widely popularized at present, in practical applications, the results of conferences are often poor due to network reasons, such as image quality degradation and dropouts during conferences. So how to properly solve this problem? The following five steps let you get rid of many troubles in video conferencing applications.
Step 1: Generally speaking, image quality degradation is one of the problems that often occur in the use of video conferencing. In addition to the quality of the network itself, whether the switch port duplex negotiation is correct and whether there are redundant routes or dual-link networks have also become The key factors that affect the image effect.
Step 2: During the investigation, the results of the network port negotiation can be seen from the MCU and the terminal, and the duplex negotiation mode can be viewed on the port of the switch. Generally manageable switches can check the current duplex mode of the switch port through commands, for example: 100Mbps-speedmode, full-duplexmode. It should be noted that if the MCU or terminal is configured with 100M full-duplex mode and the switch port is auto, then the switch port will be negotiated as 100M half-duplex. In this case, the network will experience packet loss and other problems, resulting in Mosaic appears on the screen, and even the screen freezes. Faced with this problem, you only need to manually reset the switch port to match the MCU or terminal, and the problem will be solved.
Step 3: Facing the problem of dual-link analysis is particularly complex and critical. First, you need to recognize that there is a difference between redundancy routing and load balancing. The redundant route is one line acTIve, the other line standby. Load balancing is two lines simultaneously acTIve, specifically divided into load balancing based on data flow and load balancing based on data packets. Based on the load balance of the data flow, the network equipment automatically distributes the traffic according to the line load, and each session path is the same. Based on the load balancing of data packets, the network equipment distributes the load evenly. Each data packet has one path, and each session may have more than two paths. When the data packets take different paths, different time differences will appear when they arrive at the destination, causing the packets to be out of order. In severe cases, the data packets will be discarded, which will lead to the disorder of the picture.
Step 4: Usually, when encountering the drop-out problem, the analysis is mainly carried out from the two levels of conference and network. When checking from the conference level, you must first observe on the MCU (such as MGC and RMX), you can see the specific reason for the terminal disconnection on the management interface. In addition, related information can also be viewed in the CDR log. Secondly, we can observe whether the connection can be reconnected immediately after the terminal is disconnected. If the connection can be reestablished immediately, it can be judged that the device itself is not faulty, and the network should be investigated to find the fault point and deal with it. If you can't establish a connection, you can use your computer or terminal to ping the drop point. If you can't ping it, you can judge it is a network failure. If you can PING pass, you need to do further testing, if serious, you can also seek help from the manufacturer.
Step 5: To check from the network, first of all, you need to collect the necessary network data, such as the network topology diagram, circuit conditions and equipment layout, etc., and observe the disconnection through a simple test. If it is a large-area drop rather than an individual drop, then the failure point may occur at the convergence layer or core layer of the network. In addition, you can also use the point-to-point ping of the video IP network segment to open the ping monitoring network in the conference: Pingip–t–l1260》 test.txt. If there is packet loss at the same time, the problem occurs on L2 / L3. If it is not found Packet loss, the problem may be above L4. The above small methods can help you find and solve problems quickly and in a timely manner, and avoid losses and troubles caused by unstable pictures in the meeting.
Take a deep breath, close your eyes, the world has the freshest oxygen ... Yu Quan's "Deep Breath" is well known to us, but as the environmental problems become more and more serious, the haze sky also increases, PM2.5 PM10 and so on Vocabulary has also been mentioned more and more, and air purifiers have quickly become popular on the market with this "air quality" trend. Along with this, the air-clean brand has sprung up, and various technologies are dazzling. Which ones are indeed effective and which are just tasteless propaganda? How does the Air Purifier bother us to get rid of pollution? And look at the editors for you.
Analysis of air purifier
The critical value of PM2.5 content is 75 μg / m3
The pollutants in the air mainly include soot, total suspended particulates, inhalable particulates (PM2.5) and fine particulates (PM10). The smaller the diameter of the particulates, the deeper the part that can enter the respiratory tract. 10 micron diameter particles It is deposited in the upper respiratory tract, and particles below 2 microns can penetrate 100% into the bronchiole and alveoli.
1k-5k air purifier prices vary greatly
The air purifier products on the market not only have various functions, but also have prices ranging from thousand yuan to tens of thousands. The pricing of imported products is generally higher than that of domestic brands. Except for the core technology of many brands, the promotion of purification effects is similar, and consumers need to choose according to demand.
The air quality standard of 74 key cities is only 4.1%
According to the data of the press conference held by the State Council Information Office on June 4, according to the new "Ambient Air Quality Standards", the six pollutants SO2, NO2, PM10, PM2.5, CO and O3 were evaluated, 74 new standards In the first phase of monitoring and implementation, the proportion of cities that met the ambient air quality standards was only 4.1%, and the other 256 cities implemented the old air quality standards, and the proportion of cities that met the standards was 69.5%.
Air purifier sales increased by 90.5% compared with last year
According to a report recently released by the China Electronics and Information Industry Development Institute, due to the haze weather, air purifiers have become the most concerned home appliance products, with sales of nearly 2.4 million units nationwide last year, a year-on-year increase of 90.5%; retail The amount reached 5.6 billion yuan, a year-on-year increase of 105.9%.
HEPA filter needs to be replaced in March
The filter of the air purifier is the same as the filter of the water purifier, and it is not effective for a long time. After long-term use, the accumulation of dust on the surface of the filter will also cause the filter to gradually fail. Therefore, when the haze is more serious, the non-washable HEPA filter needs to be replaced every three months.
Merchants claim that the purification rate is more than 99% for the concept of stealing
99% or even 99.99% seems to have become a slogan for many air purifiers on the market. Many brands of products promote their high removal rate of PM2.5 and formaldehyde. In fact, this kind of publicity is more of a kind. The slogan of stealing the concept, the removal rate of 99% is the effect of the material itself on PM2.5 and formaldehyde, not the effect of actually running in space.
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