Optimized dual-band Wi-Fi

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  • Saturday, December 11, 2010
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  • Wi-Fi router supports 2 types and frequency and type of support only one frequency has advantages and disadvantages.Positive evolution of the media makes everything better, faster and more reliable. USB 1.0 is lifted USB 2.0, FireWire 400 to FireWire 800 standard, 10Mbps Ethernet speeds of 100Mbps and even 1.000Mbps - Gigabit router wireless router (Wi-Fi) 802.11b 11Mbps speed of development also 802.11g up to 54Mbps speed and then speed up to 300Mbps 802.11n draft 2.0, Wi-Fi router single frequency (2.4 GHz or 5 GHz) to Wi-Fi router dual band (dual-band) - supported devices using the 2.4 GHz and 5 GHz.
    In theory, Wi-Fi router is dual-band router supports two 2.4 GHz and 5 GHz frequencies.Due to price competition, as well as desired features for up to several customers, the firm had a Wi-Fi router design dual-band into two main categories: (1) supports two frequencies simultaneously and (2) only support one frequency at a time. Previously, the router supports dual-band 802.11a and 802.11b / g, this device is now more support 802.11n draft (that supports 802.11a, 802.11b / g, draft 802.11n). In this article, we only mention the dual-band router supporting 802.11n draft standard.
    Wi-Fi router supports 2 types and frequency and type of support only one frequency has advantages and disadvantages. For example, the device supports two 2.4 GHz and 5GHz frequencies simultaneously, such as D-Link DIR-855 (ID: A0905_68), all Wi-Fi equipment from 802.11a/b/g to 802.11n draft 2.0 can share a network. However, as you know, there is so much a network access device will lead to slow access speeds due to bandwidth sharing for multiple machine use for many different purposes. In particular, not to mention the case of civil equipment causing interference to affect speed. Of course, with this type of router, you can "turn off" one or two fixed frequencies according to a timetable of priority bandwidth for essential needs.
    Meanwhile, Wi-Fi router supports only one frequency at a time such as the Linksys WRT320N (ID: A0907_75) has its own advantages such as cheaper than router supports two frequencies simultaneously, each time only Wi-Fi devices compatible with 2.4 GHz or 5 GHz can access the network, so most cases will avoid overloading.
    Wi-Fi router using dual-band
    Wi-Fi router, dual-band usually has at least two SSID (network name Wi-Fi), so you can customize the SSID and encryption mode (WPA2/WPA/WEP).
    With devices that support two simultaneous frequencies DIR-855, you have two options set: In the context of a variety of devices (PCMCIA, USB, CardBus, Express, or integrated network card on laptop .. .) supports two frequencies simultaneously, you can set the network name and encryption settings on both the same SSID to the client 2 (Wi-Fi client) dual-band can use the "full" tape communication network. If your network equipment supports many different standard - most 802.11b routers - the network speed will slow down. To fix this, you put two different SSID, passwords were different. In particular, at 2.4 GHz, you should encrypt lower if the network has many old standard equipment. The benefits in this setting is that you "enjoy" the advantages of 5 GHz (low interference, high speed to watch online.)

    (Figure 1: Wi-Fi Router supports two frequencies simultaneously)

    With Wi-Fi router does not support dual-band 2 frequencies simultaneously, you can do to change the network name and save the configuration for each frequency. If you wish to switch to another frequency, you do not need to set up from scratch (at least the network name and password in encrypted mode.)
    Both 2.4 GHz and 5 GHz frequencies used for Wi-Fi routers do not need licensing, which means any individual or organization can also use this frequency. Therefore, interference between devices is unavoidable.

    Figure 2: Wi-Fi Router supports only one frequency at a time
    Wi-Fi network to optimize, you should balance between the components: interference (almost completely at 2.4 GHz), coverage and speed. These three elements are closely related to each other: large interference to the speed and the coverage poor; broad coverage makes the slow-down, the higher the speed the greater the interference and workstations The closer the device over Wi-Fi.
    The influence dual-band Wi-Fi
    1) Interference in the 2.4 GHz frequency: 2.4 GHz frequency was "contaminated" because this is a serious amateur frequencies (ISM), free use, so often used in industrial, scientific and medical Although many devices are not used for communication but also in the process used to create electrical signals from (a phenomenon causes interference).
    Some causes of interference:
    Microwave oven also uses the 2.4 GHz to warm up food ... Microwave generated vibration signal about 1.000W 2.4 billion times per second - 2.4 GHz. This is causing the interference. Despite the microwave shielding shell to limit air emissions to the outside, but there are small amounts of beam exit "disruptive" Wi-Fi and reduce signal quality.
    Solution: Move Wi-Fi equipment and kitchen equipment emission apart or 5 GHz frequency use less power than the jamming.
    Network hardware and 2.4 GHz frequency. 2.4 GHz frequency used for many purposes on different devices such as Bluetooth, the phone cradling her child, the child monitoring devices, integrated camera / video, projector ...
    Solution: Upgrade equipment, such conversion to the 5.8 GHz phone, baby monitor devices for better or 5GHz Wi-Fi use.
    Some channels do not overlap each other. The devices use the more overlapping channels, the interference between the larger network. In residential buildings, or you can "see" tens of networks that use the same frequency and were all "collisions" with each other to slow down and sometimes "drop" network.
    Solution: Switch to using 5 GHz frequency devices. If you still want to use the 2.4 GHz frequency, you can use 3 non overlapping channels 1, 6 and 11 to set up Wi-Fi router for three close together (each Wi-Fi router choose a channel).
    2) Coverage in the 2.4 GHz frequency: 2.4 GHz advantage of the coverage is wider than 5GHz. Short wavelength of the 5 GHz frequency can not penetrate hard structures such as walls, ceilings, desks and people.
    Some causes affect coverage:
    Coverage of 5 GHz seems quite small compared to 2.4 GHz. You try to go around the room and could not get to see the signal strength or 5GHz network.
    Solution: In all ability possible, Wi-Fi client will automatically choose the lowest number of 5GHz channels (or select it manually.) If you select channel 149 or higher and having problems with the network, try the other three options (153, 157 and 161) and if still having problems, go on automatic mode.
    Slow connection speeds. When checking on the devices you add 802.11n connectivity at a speed 5GHz frequency or slower than 130Mbps.
    Solution: Make sure the channels have enabled the broadband (wide channel) 40MHz on the router. With 802.11n, Wi-Fi client can connect via broadband channel-width double the normal channels (20MHz). Apple and several other manufacturers do not select the channel bandwidth to 2.4 GHz by too much interference affecting the signal.Meanwhile, the 5 GHz frequency interference levels are significantly lower. So Apple set up the router for dual-band Wi-Fi broadband using the automatic channel. If you do not see a speed of 270Mbps - the speed, you check this option has been turned on yet.
    Low-speed data transmission.
    Solution: If the device transmitter and receiver separated, you should move them closer together or to add a Wi-Fi network to extend the 2nd. Also, you should also check the interference problem by moving the source of interference or Wi-Fi devices away from each other to improve speed. Another reason, you should avoid using the 2.4 GHz frequency device that should switch to using 5 GHz frequency. This helps to release the 2.4 GHz, ensuring faster speeds for 802.11n devices. The advantage of the 5 GHz frequency is very small devices using this frequency, thus limiting interference issues, improving network speeds, ensuring a more stable connection.


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