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TL-WN851ND : no 802.11n available
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Tom_
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Joined: 20 May 2004
Posts: 384
Location: France

PostPosted: Thu Mar 14, 2019 1:31 pm    Post subject: TL-WN851ND : no 802.11n available Reply with quote

Hello,

I've got a TL-WN851ND wifi adapter in my computer. I just found out that this adapter only sees 2.4 ghz frequencies. That would explain why it has been so slow ...

The adapter specs are : https://www.tp-link.com/en/products/details/TL-WN851ND.html#specifications

My AP runs at 2.4 and 5 ghz.

Code:
thomas@gentoo ~ % lspci -vvnn | grep Network -A7
06:01.0 Network controller [0280]: Qualcomm Atheros AR9227 Wireless Network Adapter [168c:002d] (rev 01)
       Subsystem: Qualcomm Atheros AR9227 Wireless Network Adapter [168c:0300]
       Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
       Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
       Latency: 168, Cache Line Size: 4 bytes
       Interrupt: pin A routed to IRQ 16
       Region 0: Memory at faff0000 (32-bit, non-prefetchable) [size=64K]
       Capabilities: <access denied>
       Kernel driver in use: ath9k



Code:
thomas@gentoo ~ % iwlist wlp6s1 frequency
wlp6s1    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:2.462 GHz (Channel 11)


Code:
thomas@gentoo ~ % iwconfig
wlp6s1    IEEE 802.11  ESSID:"CXNK0041D527" 
          Mode:Managed  Frequency:2.462 GHz  Access Point: CC:BE:59:39:EF:97   
          Bit Rate=57.8 Mb/s   Tx-Power=19 dBm   
          Retry short limit:7   RTS thr:off   Fragment thr:off
          Power Management:off
          Link Quality=42/70  Signal level=-68 dBm 
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:76   Missed beacon:0


Code:
thomas@gentoo linux % grep CFG80211 /usr/src/linux/.config
CONFIG_CFG80211=m
# CONFIG_CFG80211_DEVELOPER_WARNINGS is not set
# CONFIG_CFG80211_CERTIFICATION_ONUS is not set
CONFIG_CFG80211_DEFAULT_PS=y
# CONFIG_CFG80211_DEBUGFS is not set
# CONFIG_CFG80211_INTERNAL_REGDB is not set
CONFIG_CFG80211_CRDA_SUPPORT=y
CONFIG_CFG80211_WEXT=y


Code:
thomas@gentoo linux % grep MINSTREL /usr/src/linux/.config
CONFIG_MAC80211_RC_MINSTREL=y
CONFIG_MAC80211_RC_MINSTREL_HT=y
# CONFIG_MAC80211_RC_MINSTREL_VHT is not set
CONFIG_MAC80211_RC_DEFAULT_MINSTREL=y


Code:
thomas@gentoo linux % grep ATH9 /usr/src/linux/.config     
CONFIG_ATH9K_HW=m
CONFIG_ATH9K_COMMON=m
CONFIG_ATH9K_BTCOEX_SUPPORT=y
CONFIG_ATH9K=m
CONFIG_ATH9K_PCI=y
# CONFIG_ATH9K_AHB is not set
# CONFIG_ATH9K_DEBUGFS is not set
# CONFIG_ATH9K_DYNACK is not set
# CONFIG_ATH9K_WOW is not set
# CONFIG_ATH9K_CHANNEL_CONTEXT is not set
CONFIG_ATH9K_PCOEM=y
# CONFIG_ATH9K_HTC is not set
# CONFIG_ATH9K_HWRNG is not set


Do you know why i'm not able to have 802.11n?

Thank you

Thomas
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eccerr0r
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Joined: 01 Jul 2004
Posts: 7033
Location: almost Mile High in the USA

PostPosted: Thu Mar 14, 2019 3:34 pm    Post subject: Reply with quote

802.11n is a signaling protocol. It can run at 2.4GHz as well.

The webpage spec sheet you linked indicates that the adapter you have is not dual band, and thus cannot use the 5GHz frequencies.

I have many 802.11n devices that are restricted to the 2.4GHz due to the same problem. They do get a boost from the signaling, but eat up a lot of the 2.4GHz band to do so. Any other people around you could chew up on that limited bandwidth.
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Tom_
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Joined: 20 May 2004
Posts: 384
Location: France

PostPosted: Fri Mar 15, 2019 9:23 am    Post subject: Reply with quote

@eccerr0r, thank you for your reply.

You're right about this 2.4 Ghz limit but according to the specs, it should be able to run at 300mbps.

Yesterday afternoon, I moved the AP very close to this computer but i didn't get anything better than 54 mpbs.

When you said "a lot of the 2.4GHz band", did you mean configuring a 40mhz bandwidth instead of a 20mhz bandwidth?

Is there anything i should do to get more than 54mbps ?

Thomas
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eccerr0r
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Joined: 01 Jul 2004
Posts: 7033
Location: almost Mile High in the USA

PostPosted: Fri Mar 15, 2019 2:11 pm    Post subject: Reply with quote

Remember that the channels overlap when using wide bands. Unless you're out in an RF quiet area, there's no guarantee that you will get full bandwidth.

What if you move closer to the AP? Can you get faster speeds that way?

I think what you see is pretty much what you get (it did try to get 57Mbit link which is at least better than 802.11g), not much you can configure due to the FCC anyway.
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