Author Topic: WZR-1750DHP firmware v2.24, 2.4GHz performance dropped off rapidly.  (Read 7416 times)

esper

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MY friend and I both have WZR-1750DHP, firmware v2.24 , and they have the same problem.

We found that WZR-1750DHP 2.4GHz 20MHz performance dropped off rapidly when the signal path through 2 Walls in 10m distance.

I also have WZR-HP-AG300H (firmware v1.78) , and its performance is better than WZR-1750DHP at 2.4GHz 20MHz in the same circumstances.

here is MY test details:
laptop:  HP 8570w , windows 7 32bit; intel 6300AGN mini PCI-E card, intel proset wireless software v16.11 .
distance between laptop and router:  10m ,  2 Walls between.
set: 2.4GHz  20MHz  channel  3, other settings use factory default.
environment: may has serious multiplepath effect .

use WZR-1750DHP  firmware v2.24 , the laptop wireless driver shows:  -68dbm signal,  1Mbps to 13Mbps speed. internet content download is slow and may drop .
(the wireless speed shows 216.7 Mbps when I move this laptop very close to the router 1750DHP.)

use WZR-HP-AG300H  firmware v1.78, the laptop wireless driver shows:  -72dbm signal,  13Mbps to 58Mbps speed. internet content download is ok .
(the wireless speed shows 130 Mbps when I move this laptop very close to the router AG300H.)


WZR-1750DHP 's signal is better than WZR-HP-AG300H ,
but WZR-1750DHP 's wireless speed is worse than WZR-HP-AG300H.   

WHY ???

HOW CAN I SOVLE THIS PROBLEM ? 
CHANGE which setting will solve this problem ???  ( web login : 192.168.11.1 ,  admin,  password)

 
I am wondering that WZR-1750DHP use the SHORT GI (400ns) and WZR-HP-AG300H use the LONG GI (800ns)?
How can I change 1750DHP to LONG GI (800ns) ?
Because the environment may has serious multiplepath effect, using SHORT GI is not a good idea.
AM I RIGHT ?

HOW CAN I SOVLE THIS PROBLEM ?     

thanks.

esper

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Re: WZR-1750DHP firmware v2.24, 2.4GHz performance dropped off rapidly.
« Reply #1 on: February 15, 2015, 12:18:09 pm »
At the same time, WZR-1750DHP router's log shows this error may times:

wl1: wlc_ampdu_tx_recv_delba: AMPDU OFF: tid 0 initiator 0 reason 39.


what does this mean ?  what can I do with this problem ?

thans.

esper

  • Calf
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Re: WZR-1750DHP firmware v2.24, 2.4GHz performance dropped off rapidly.
« Reply #2 on: February 19, 2015, 11:07:03 am »
1. MAKE 1750dhp MUCH BETTER:

Today, I changed the 1750DHP's 2.4GHz wireless advanced setting  [Frame Burst]  to  [OFF] .

Then my laptop shows 2.4GHz wireless speed comes up to  2Mbps~78Mbps.
(20MHz , channel 3 , signal -61dbm , 26Mbps~78Mbps at most times .  6300AGN with intel proset v16.11 )

1750DHP's 2.4Ghz wireless speed is much better than before.

BUT  2.4Ghz wireless speed stability is not as good as AG300H. 


2. AND STILL the error log shows these many times :

"
2015/02/19 19:51:49 WIRELESS wl1: wlc_ampdu_tx_recv_delba: AMPDU OFF: tid 0 initiator 0 reason 39 
2015/02/19 19:51:11 WIRELESS wl1: wlc_ampdu_tx_recv_delba: AMPDU OFF: tid 0 initiator 0 reason 39 
2015/02/19 19:50:58 WIRELESS wl1: wlc_ampdu_tx_recv_delba: AMPDU OFF: tid 0 initiator 0 reason 39 
2015/02/19 19:50:44 WIRELESS wl1: wlc_ampdu_tx_recv_delba: AMPDU OFF: tid 0 initiator 0 reason 39 
2015/02/19 19:50:11 WIRELESS wl1: wlc_ampdu_tx_recv_delba: AMPDU OFF: tid 0 initiator 0 reason 39 
2015/02/19 19:50:01 WIRELESS wl1: wlc_ampdu_tx_recv_delba: AMPDU OFF: tid 0 initiator 0 reason 39 
2015/02/19 19:49:26 WIRELESS wl1: wlc_ampdu_tx_recv_delba: AMPDU OFF: tid 0 initiator 0 reason 39 
2015/02/19 19:48:45 WIRELESS wl1: wlc_ampdu_tx_recv_delba: AMPDU OFF: tid 0 initiator 0 reason 39 
2015/02/19 19:48:35 DHCPS Request incoming from HP-8570w(len:12)
"


HOW CAN I SOLVE all these problems totally ?

THANKS~~~

jaaason

  • Calf
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Re: WZR-1750DHP firmware v2.24, 2.4GHz performance dropped off rapidly.
« Reply #3 on: February 21, 2015, 01:59:03 pm »
Just curious, why are you using 20MHz?  Do you have some devices that don't work with 40?  To get the fastest speeds, 40MHz channel width is required.

One thing to check, make sure Basic Rate is not 1-2 on the WL1-Advanced tab.

esper

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Re: WZR-1750DHP firmware v2.24, 2.4GHz performance dropped off rapidly.
« Reply #4 on: February 22, 2015, 09:57:04 am »
BSS Basic Rate Set (use factory default)
2.4 GHz:1, 2, 5.5, 11 Mbps
5 GHz:6、12、24 Mbps

PS:
There are too many other 2.4GHz wireless networks around .
2.4GHz, 20MHz, channel 3  seems minimize the interference .

5GHz, I use 40 MHz , channel 161+157.
« Last Edit: February 22, 2015, 09:59:27 am by esper »

esper

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Re: WZR-1750DHP firmware v2.24, 2.4GHz performance dropped off rapidly.
« Reply #5 on: February 25, 2015, 08:42:51 am »
Today, my laptop shows 2.4GHz wireless speed down to  5.5Mbps~13Mbps again.
No change in 1750DHP settings.
(20MHz , channel 3 , signal -61dbm , 6300AGN with intel proset v17.14)


2.4Ghz wireless speed stability is not as good as AG300H. 

error log:

2015/02/25 22:41:30 WIRELESS wl1: wlc_ampdu_tx_recv_delba: AMPDU OFF: tid 0 initiator 0 reason 39 
2015/02/25 22:41:21 WIRELESS wl1: wlc_ampdu_tx_recv_delba: AMPDU OFF: tid 0 initiator 0 reason 39 
2015/02/25 22:41:08 WIRELESS wl1: wlc_ampdu_tx_recv_delba: AMPDU OFF: tid 0 initiator 0 reason 39 
2015/02/25 22:40:56 WIRELESS wl1: wlc_ampdu_tx_recv_delba: AMPDU OFF: tid 0 initiator 0 reason 39 
2015/02/25 22:40:48 WIRELESS wl1: wlc_ampdu_tx_recv_delba: AMPDU OFF: tid 0 initiator 0 reason 39 
2015/02/25 22:40:31 WIRELESS wl1: wlc_ampdu_tx_recv_delba: AMPDU OFF: tid 0 initiator 0 reason 39 
2015/02/25 22:40:24 DHCPS Request incoming from HP-8570w(len:12) 


HOW CAN I SOLVE THIS??

THANKS~~~

esper

  • Calf
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Re: WZR-1750DHP firmware v2.24, 2.4GHz performance dropped off rapidly.
« Reply #6 on: February 25, 2015, 09:51:58 am »
I am wondering that WZR-1750DHP use the SHORT GI (400ns) and WZR-HP-AG300H use the LONG GI (800ns)?
How can I change 1750DHP to LONG GI (800ns) ?

Because there are too many other 2.4GHz wireless networks around and my environment may has serious multiplepath effect, using SHORT GI is not a good idea .

AM I RIGHT ?

HOW CAN I SOVLE THIS PROBLEM ?     

esper

  • Calf
  • *
  • Posts: 12
Re: WZR-1750DHP firmware v2.24, 2.4GHz performance dropped off rapidly.
« Reply #7 on: February 25, 2015, 08:58:45 pm »
WZR-1750DHP firmware v2.24 2.4GHz performance is worse than WZR-HP-AG300H.

WHAT A PITY~~~

davo

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Re: WZR-1750DHP firmware v2.24, 2.4GHz performance dropped off rapidly.
« Reply #8 on: February 26, 2015, 09:46:45 am »
Using DDWRT 23919 -> No issues.
PM me for TFTP / Boot Images / Recovery files  LSRecovery.exe file.

esper

  • Calf
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Re: WZR-1750DHP firmware v2.24, 2.4GHz performance dropped off rapidly.
« Reply #9 on: March 22, 2015, 05:49:08 am »
Will buffalo launch new firmware v2.25 ?

esper

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Re: WZR-1750DHP firmware v2.24, 2.4GHz performance dropped off rapidly.
« Reply #10 on: March 22, 2015, 09:20:41 am »
Does 1750DHPD with dd-wrt 23709c have the same problem ?