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, the actual load of the AP may increase or decrease. These changes can be learned through testing and monitoring the WLAN. The network administrator should promptly adjust the number and distribution of APS based on actual changes. 2.4 frequency interference After the AP is fixed and the coverage is determined, the frequency allocation should be considered. 802.11b and 802.11g occupy GHz free band. Because many countries use this band for cordless phones, Bluetooth devices, and
The wireless LAN network transmits signals through microwave, so the signal transmission security of the wireless LAN makes many wireless Internet users a little worried. In fact, as long as they are familiar with the signal transmission mechanism of the wireless network, we can also use some security measures to ensure the security of the wireless LAN. CIO channel weekly hot "point" Article CIO experience is more important than education background?
dedicated Broadband LAN such as optical fiber, the oil wells are mostly in a deserted area, with high mobility. Although satellite and microwave transmission technologies are used, however, the huge operation costs remain high, and the transmission speed needs to be improved.Thirdly, the working environment of the oil production site cannot meet the requirements of mobile office: for example, an exploration engineer from a research organization in Be
fixed-direction antenna. Otherwise, you can select a non-oriented antenna. According to the company, the fixed-direction antenna is connected to either the master or slave end, and the communication distance will be extended by about two times. If both the master and slave are connected to the antenna, the communication distance will be extended by about four times. Reduce interference with household appliances In a wireless LAN, The 11b AND 11g types Use a 2-4 GHz band wireless signal. Because
power. On the other hand, they must ensure that they are subject to a certain degree of interference from other work devices in the same frequency band, it can work stably. The spread spectrum signal processing technology is like magic, so that various systems can coexist at the same time. The Spread Spectrum System is very stable, but it is worth noting that coherent interference is inevitable when designing a Multi-unit Enterprise spread spectrum system. This must be clarified, because it wil
-term solution for broadband access development. However, this method still has the disadvantages of High Engineering Cost and slow construction speed. For some network operators, local network resources are not available. In this case, to enter and occupy the access market, using the broadband wireless access network technology is a more appropriate entry point. Currently, there are four types of broadband wireless access network technologies: MMDS, LMDS, satellite communication access technolo
card of the PCMCIA Interface does not have this problem. Wireless LAN faults: The system crashes after the wireless PCMCIA Nic is unplugged. Cause and solution: Generally, this type of operation is caused by non-standard operations. The standard operation sequence is to first disable the device in the PCMCIA Nic attribute, and then unplug the device. Or select "pop-up Device" and unplug the NIC. Wireless LAN faults: If you purchase a new wireless network device, it is often abnormal when you ch
consider the environment when selecting the placement location. Keep the route away from cordless phones and microwave ovens as much as possible. In addition, it can even be used in air conditioners, washing machines, and refrigerators to avoid electromagnetic interference or disconnection. Due to the special nature of the wireless network signal, we have to consider the environment when installing or deploying the network. In the family, the main de
external antennas, Japan's BUFFALO has released two kinds of products: "WLE-DA" and "WLE-NDR. If the direction of the master and slave is basically determined, you can select a fixed-direction antenna. Otherwise, you can select a non-oriented antenna. According to the company, the fixed-direction antenna is connected to either the master or slave end, and the communication distance will be extended by about two times. If both the master and slave are connected to the antenna, the communication
number of trials. You can view the information on the Management Console. If the network performance drops, it is a good step to view the number of retries. If the noise intensity in your network bandwidth exceeds-85dBm, RF interference may damage network performance. In this case, the user's retry rate will exceed 10%, then the user will feel the network speed is affected. For example, this happens when a wireless user is in the same room as a running micr
transfer a 1 GB file. This speed is sufficient for General Lan applications. ◆802.11 GB + The theoretical maximum speed of 802.11g + is 108 Mbps. The WLAN wireless transmission speed is generally between 24-50 Mbps and is converted to MB, that is, the transmission speed is about 3 mb-6mb per second. The median value is 4.5 MB. It takes about 25 seconds to transfer a MB file. To transfer a 1 GB file, it takes at least two minutes and a half. The speed is close to Mbps, and more than enough for m
introduction of the micro-base station concept also has a huge impact on backhaul. Many LTE operators are considering deploying several (from two to ten) Micro base stations around an LTE macro base station. These micro base stations can increase throughput and coverage. In this mode, the traffic of the macro base station is returned by the aggregation device at the base station. The traffic of the micro base station is transmitted back to a nearby macro base station or base station aggregation
3G is no longer a pioneer in Internet development. The emergence of 4G is even more prominent. Here, we will introduce the solutions for 4G networks and Wimax wireless technology. The Nortel solution is used as an example. Let you go into the infinite imagination of the future. What is WiMAX wireless technology? WiMax (Worldwide Interoperability for Microwave Access), that is, global Microwave interconnecti
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Remember in the undergraduate "communication principle" of the first lesson, the teacher asked us a question: "Do you know the basic theory of communication to make the greatest contribution to the person who is it?" "Everyone said a lot of names, but the teacher just shook his head." Finally, she said: "Everyone said is wrong, the greatest contribution is Shannon." "That's when I learned about Shannon and learned the Shannon formula in this course."Later, I learned more about "communication" co
transmission and the receiving end are in narrowband mode, while the transmission process is in broadband mode. The fhss lan supports 1 Mbit/s data rate. There are 22 groups of frequency hopping patterns, including 79 channels. After the output synchronous carrier is mediated, the information sent by the sender can be obtained. Both DSSS and FHSS Wireless LAN use radio waves as media, with a large coverage and low emission power compared with natural background noise. This basically avoids eave
the meeting, but if does not have this feeling, he will not know in the future this thing will use, has no use. Use the early prototypes, try them out in a similar situation, and discover some of the major design problems early on, so that you don't find the problem until after it's done. Finally, the author gave an interesting example, if you were in a laboratory with a lot of electronic equipment, suddenly found in the clothes pocket 2 The candy melts, what will you do with it? Some people wi
coupling between the reader and the electronic tag:(Ⅰ) inductance coupling. The transformer model, through the space high frequency alternating magnetic field realizes the coupling, is based on the electromagnetic induction law.(Ⅱ) Electromagnetic backscatter coupling. The radar principle model, the emitted electromagnetic wave, touches the target to reflect, simultaneously carries back the target information, is based on the electromagnetic wave space propagation law. Induc
. I am a stranger to a lot of things in my house. I used a microwave oven to unfreeze and steam my meals. I didn't know which one to use for a long time. I made a cup of coffee or tea, cook a bowl of instant noodles and a bowl of hot soup. The taste is different from what she made. In the past, she handed me the daily necessities easily, and now I have rummaged through the drawer and haven't found them yet.From her stay in hospital, I began to take pu
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