如何確定我的無線卡是否支援 5 GHz?

如何確定我的無線卡是否支援 5 GHz?

我有

03:00.0 Network controller: Intel Corporation Centrino Wireless-N 2200 (rev c4)

如何確定該卡/驅動程式是否支援 5 GHz?

答案1

透過運行找出介面名稱iwconfig

$ iwconfig
eth0      no wireless extensions.

lo        no wireless extensions.

wlan0     IEEE 802.11bgn  ESSID:"EvanCarroll"  
          Mode:Managed  Frequency:2.437 GHz  Access Point: D8:50:E6:44:B2:C8   
          Bit Rate=19.5 Mb/s   Tx-Power=15 dBm   
          Retry  long limit:7   RTS thr:off   Fragment thr:off
          Power Management:off
          Link Quality=61/70  Signal level=-49 dBm  
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:1  Invalid misc:80   Missed beacon:0

在這種情況下wlan0,然後運行iwlist <interface> freq

$ iwlist wlan0 freq
wlan0     13 channels in total; available frequencies :
          Channel 01 : 2.412 GHz
          Channel 02 : 2.417 GHz
          Channel 03 : 2.422 GHz
          Channel 04 : 2.427 GHz
          Channel 05 : 2.432 GHz
          Channel 06 : 2.437 GHz
          Channel 07 : 2.442 GHz
          Channel 08 : 2.447 GHz
          Channel 09 : 2.452 GHz
          Channel 10 : 2.457 GHz
          Channel 11 : 2.462 GHz
          Channel 12 : 2.467 GHz
          Channel 13 : 2.472 GHz
          Current Frequency:2.437 GHz (Channel 6)

這些通道均不在 2.4 GHz 之外。它不支援 5 GHz。

答案2

如果您想了解您的卡片支持什麼,iw phy這是一個很好的解決方案很多更多資訊(包括支援的頻段)。

iwlist顯示更多您的區域設定中可用和/或允許的內容、由於 DFS 通道等而停用的內容,而不是您的裝置支援的內容。從iwlist手冊頁:

   freq[uency]/channel
          Give  the  list of available frequencies in the device and the number of defined channels. Please note that usually the
          driver returns the total number of channels and only the frequencies available in the present locale, so  there  is  no
          one-to-one mapping between frequencies displayed and channel numbers.

答案3

執行 iwconfig 時,您將獲得以下可能的資訊:

  1. IEEE 802.11bgn = 僅 2.4 GHz
  2. IEEE 802.11gn = 僅 2.4 GHz
  3. IEEE 802.11agn = 2.4 GHz + 5 GHz

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