Re: In F16, Atheros AR5008 being restricted to 18mb/s

JD <jd1008@xxxxxxxxx> · Tue, 22 May 2012 18:53:27 -0700

On 05/22/2012 02:39 PM, Steven Stern wrote:

On 05/20/2012 05:55 PM, JD wrote:

$ iwconfig wlan0
wlan0     IEEE 802.11bgn  ESSID:"Private"
           Mode:Managed  Frequency:2.452 GHz  Access Point:
00:AA:BB:CC:DD:EE
           Bit Rate=18 Mb/s   Tx-Power=27 dBm
           Retry  long limit:7   RTS thr=2346 B   Fragment thr=2346 B
           Power Management:off
           Link Quality=58/70  Signal level=-52 dBm
           Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
           Tx excessive retries:0  Invalid misc:32   Missed beacon:0

I have an Atheros (D-link) card that says it's at 54M, but I rarely get
24M when going to other computers on the lan... usually about 11M.  Your
link quality seems better than mine.

$ iwconfig wlan0
wlan0     IEEE 802.11bg  ESSID:"Bandit"
           Mode:Managed  Frequency:2.422 GHz  Access Point:
00:18:E7:F7:50:2A
           Bit Rate=54 Mb/s   Tx-Power=27 dBm
           Retry  long limit:7   RTS thr:off   Fragment thr:off
           Power Management:off
           Link Quality=45/70  Signal level=-65 dBm
           Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
           Tx excessive retries:1  Invalid misc:1598   Missed beacon:0

If you notice, we have different signal levels (quality).

When I pasted this observation, I had

Link Quality=58/70  Signal level=-52 dBm

whereas you have 45/70 - yet you are still at 54 Mb/s

Currently, I switched to an external (usb) high power
(1000 mw) wifi adapter AWUS036H with a 20dBi antenna,
and look at what iwconfig wlan1 reports:

$ iwconfig wlan1
wlan1     IEEE 802.11bg  ESSID:"Private"

          Mode:Managed  Frequency:2.452 GHz  Access Point: 

00:AA:BB:CC:DD:EE

          Bit Rate=18 Mb/s   Tx-Power=20 dBm
          Retry  long limit:7   RTS thr=2346 B   Fragment thr=2346 B
          Power Management:off
          Link Quality=70/70  Signal level=-37 dBm
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:1250   Missed beacon:0

I have 100% signal quality ( which is gauged by the strength of
received signal??? don't know!), and yet the rate is fixed at 18 Mb/s.

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