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advanced-wireless [2022/03/09 15:43] – [Fragmentation Threshold]-formatting hogwildadvanced-wireless [2022/03/09 15:53] – [Universal/Implicit beamforming]-added "faster" to data rates hogwild
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 ====== Advanced Wireless ====== ====== Advanced Wireless ======
  
-The Advanced Wireless menu contains settings for advanced tuning of Wi-Fi interfaces. Changing these settings from the defaults is not recommended unless you are experienced with advanced Wi-Fi settings. All default settings in the dropdown menus on this page are noted with an asterisk (*). For basic Wi-Fi settings, see the wiki page for the [[network|Network]] menu. \\+The Advanced Wireless menu contains settings for advanced tuning of WiFi interfaces. Changing these settings from the defaults is not recommended unless you are experienced with advanced WiFi settings. All default settings in the dropdown menus on this page are noted with an asterisk (*). For basic WiFi settings, see the wiki page for the [[network|Network]] menu. \\
  \\  \\
 {{:pasted:20220309-082430.png}} \\ {{:pasted:20220309-082430.png}} \\
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   * Preemption   * Preemption
  
-Bluetooth and 2.4 GHz Wi-Fi radio waves can interfere with each other, since both operate on the same (2.4 GHz) frequency band. Choosing **Enable** can help to reduce that interference, by asking the Bluetooth devices to take turns using the same channels as your Wi-Fi.+Bluetooth and 2.4 GHz WiFi radio waves can interfere with each other, since both operate on the same (2.4 GHz) frequency band. Choosing **Enable** can help to reduce that interference, by asking the Bluetooth devices to take turns using the same channels as your WiFi.
  
 The **Preemptive** function will make FreshTomato inform the Bluetooth device about which Bluetooth channel it's operating on. The Bluetooth device can then mark that channel as "in use" and use alternate channels for its own communications. The **Preemptive** function will make FreshTomato inform the Bluetooth device about which Bluetooth channel it's operating on. The Bluetooth device can then mark that channel as "in use" and use alternate channels for its own communications.
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 **Auto:**  TBD. **Auto:**  TBD.
  
-**Mixed Mode: **Mixed Mode transmissions can be decoded by 802.11a/g clients, providing backwards compatibility. In Mixed mode, 802.11n devices transmit a legacy format preamble, followed by an HT format preamble and a legacy radio signal. A Mixed mode device must also send legacy format CTS-to-Self or RTS/CTS (Request to Send/Clear to Send) frames before transmitting. These mechanisms let other 802.11a/b/g devices sense a busy network medium and wait for another turn to transmit. This alows for backwards compatiblity with earlier protocols, but reduces throughput, compared with Greenfield, or GF-BRCM modes.+**Mixed Mode: **Mixed Mode transmissions can be decoded by 802.11a/g clients, providing backwards compatibility. In Mixed mode, 802.11n devices transmit a legacy format preamble, followed by an HT format preamble and a legacy radio signal. A Mixed mode device must also send legacy format CTS-to-Self or RTS/CTS (Request to Send/Clear to Send) frames before transmitting. These mechanisms let other 802.11a/b/g devices sense a busy network medium and wait for another turn to transmit. This allows for backwards compatiblity with earlier protocols, but reduces throughput, compared with Greenfield, or GF-BRCM modes.
  
-**Greenfield: **This 802.11n mode is also known as "High Throughput" or "HT" mode. In this mode, the protocol improves efficieny by using a high throughput modulation method and a shorter preamble. Neither of these is supported on 802.11a/b/g devices. This preamble mode compromises backwards compatiblity and can reduce throughput on some 802.11n devices not fully compatible with the standard.+**Greenfield: **This 802.11n mode is also known as "High Throughput" or "HT" mode. In this mode, the protocol improves efficiency by using a high throughput modulation method and a shorter preamble. Neither of these is supported on 802.11a/b/g devices. This preamble mode compromises backwards compatibility and can reduce throughput on some 802.11n devices not fully compatible with the standard.
  
 **GF-BRCM: **TBD. \\ **GF-BRCM: **TBD. \\
 + \\
  
 {{:pasted:20220309-083807.png}} \\ {{:pasted:20220309-083807.png}} \\
 + \\
  
 ==== Overlapping BSS Coexistence ==== ==== Overlapping BSS Coexistence ====
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   * opt. 2 AND opt. 3   * opt. 2 AND opt. 3
   * opt. 1 AND opt. 2 AND opt. 3 (All option enabled) \\   * opt. 1 AND opt. 2 AND opt. 3 (All option enabled) \\
 +\\
  
 {{:pasted:20220309-083906.png}} \\ {{:pasted:20220309-083906.png}} \\
 + \\
  
 ==== Interference Mitigation ==== ==== Interference Mitigation ====
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 In theory, this modulation method makes it possible to transmit more bits per symbol, and thus increase data rates. In reality, most claims of big increases in transfer rates are likely exaggerated. QAM links are more susceptible to noise. As a result, Turbo QAM is generally only useful in very low-noise/interference wireless environments. Many people report it being effective on line-of-sight links of up to about 25 feet. Vendors claim the range with Turbo QAM may improve when beamforming is used. You may need to experiment to see what works best on your network. \\ In theory, this modulation method makes it possible to transmit more bits per symbol, and thus increase data rates. In reality, most claims of big increases in transfer rates are likely exaggerated. QAM links are more susceptible to noise. As a result, Turbo QAM is generally only useful in very low-noise/interference wireless environments. Many people report it being effective on line-of-sight links of up to about 25 feet. Vendors claim the range with Turbo QAM may improve when beamforming is used. You may need to experiment to see what works best on your network. \\
 + \\
  
 {{:pasted:20220309-083958.png}} \\ {{:pasted:20220309-083958.png}} \\
 + \\
  
 ==== Explicit beamforming ==== ==== Explicit beamforming ====
  
-Checking this enables Explicit beamforming technology. Traditionally, most Wi-Fi routers and access points have included omnidirectional antennas. These radiate radio energy equally in all directions. This is not always the most effective/efficient way to exchange radio signals with a client device. Much of the signal goes off in directions other than the client or other device. Explicit beamforming improves on this.+Checking this enables Explicit beamforming technology. Traditionally, most WiFi routers and access points have included omnidirectional antennas. These radiate radio energy equally in all directions. This is not always the most effective/efficient way to exchange radio signals with a client device. Much of the signal goes off in directions other than the client or other device. Explicit beamforming improves on this.
  
 Beamforming radiates signals towards the receiver, instead of in an omnidirectional pattern. If the hardware has adequate information to send the radio energy in one particular direction, it will do so. The result can be an increase the signal-to-noise ratio and data rates between the two devices. Beamforming radiates signals towards the receiver, instead of in an omnidirectional pattern. If the hardware has adequate information to send the radio energy in one particular direction, it will do so. The result can be an increase the signal-to-noise ratio and data rates between the two devices.
  
-Beamforming was introduced starting with 802.11n. but vendors used different standards. This meant beamforming made little differnece in performance. With 802.11ac, the beamforming method was standardized (Explicit). Compatibility across vendors is good. Explicit beamforming requires both client and router/Access point to support the feature. If both devices support it, they'll use a handshake at the beginning of their session to help establish their respective locations and the channel on which they'll communicate.+Beamforming was introduced starting with 802.11n. but vendors used different standards. This meant beamforming made little difference in performance. With 802.11ac, the beamforming method was standardized (Explicit). Compatibility across vendors is good. Explicit beamforming requires both client and router/Access point to support the feature. If both devices support it, they'll use a handshake at the beginning of their session to help establish their respective locations and the channel on which they'll communicate.
  
 Beamforming works best at medium range. At short range, the signal power is high enough that the signal-to-noise ratio will support the maximum data rate. At long ranges, beamforming does not offer gains over an omnidirectional antenna. Beamforming works best at medium range. At short range, the signal power is high enough that the signal-to-noise ratio will support the maximum data rate. At long ranges, beamforming does not offer gains over an omnidirectional antenna.
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 ==== Universal/Implicit beamforming ==== ==== Universal/Implicit beamforming ====
  
-Beamforming is a performance feature included in Wi-Fi protocols starting with 802.11n.  Beamforming radiates signals more directly towards the receiver, instead of in an omnidirectional pattern, like older equipment. This can result in a higher signal-to-noise ratio and data rates between the two devices exchanging data.+Beamforming is a performance feature included in Wi-Fi protocols starting with 802.11n.  Beamforming radiates signals more directly towards the receiver, instead of in an omnidirectional pattern, like older equipment. This can result in a higher signal-to-noise ratio and faster data rates between the two devices exchanging data.
  
 Traditionally, most Wi-Fi routers and access points included omnidirectional antennas. These radiate radio energy equally in all directions. This is not the most effective/efficient way to exchange radio signals to another device. Much of the signal goes off in directions away from the or other wireless device. Traditionally, most Wi-Fi routers and access points included omnidirectional antennas. These radiate radio energy equally in all directions. This is not the most effective/efficient way to exchange radio signals to another device. Much of the signal goes off in directions away from the or other wireless device.
advanced-wireless.txt · Last modified: 2024/03/02 18:01 by hogwild

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