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[gajets]

Hi,
 when I set the router to 20/40 BW, I get a reliable indication of 300Mbps and it works OK on web browsing , but if I try and transfer a large file to or from my server,  it starts fast, then the link speed goes all over the place ,mostly slower and slower, until the connection fails entirely.  At this point ,the router disconnects and reconnects but the transfer is now locked up and I have to wait for a timeout error before my laptop is functional again.
 The laptop has a Gigabyte GN-WI06N-RH card with the latest driver {Atheros AR5418 wireless chipset }.

But If I set the BW to 20MHz , everything is fine and the speed stays good. but obviously limited to 130Mbps.

I would like to uses it at MAX speed, Any clues??

[EddieZ]

300 mbps stability depends on the stability of the signal. Seems like the signal is not stable enough on the max. setting. Try setting the speed manually in the router (wireless network settings) to a lower max. speed and see which max speed works.

[gajets]

I question that statement simply because the router is less than 10 feet away and the signal is VERY strong, and this behavior is there even if I am sitting on top of it.

the only change I made to stop the problem is to change from 20/40 Mhz BW to 20 MHZ BW and then  the speed is constant and stable at 130Mbps.

Please note, that the 300 Mbps is good and pretty stable as long as I only transfer smaller things, like web pages and smaller files. under about 1meg goes OK. I do not see to much trouble browsing the Internet and it stays at high speed consistently.

If I try and move a 100MB file, it first starts fast , then drops to lower speeds as the transfer progresses , and it keeps dropping speed to as lows as 1 Mbps until the sort of locks up, if I cancel the transfer. the speed cranks instantly back up on any simple access.

 Its act just like a sprinter doing the Marathon, real fast out of the gate but after the first mile , it starts to collapses and pass out, unless I force it to take a rest ever few hundred yards.
But  if I set the bandwidth to 20 Mhz  , it is a marthon runner and never quites till the race is done.

[EddieZ]

I question that statement simply because the router is less than 10 feet away and the signal is VERY strong, and this behavior is there even if I am sitting on top of it.

You might have mentioned that first in your post, don't you think?

So before any more guesses on missing info: How is your client configured (brand, settings)and what kind of PC and OS do you have? Please post the logs to see what happens insode the router.

[gajets]

Laptop is Dell XPS M1710 , 2 GHZ core duo ,4GB ram.......blah blah blah
OS is windows XP pro SP3, all latest updates...
PCIe card is Gigabyte GN-WI06N-RH {AR5418 chiset} latest drivers from gigabyte.
DIR-655 firmware is 1.21 from Dlink
used as a access point, not a router, nothing on Wan port.
Mixed mode 802.11n,g,b
auto channel
auto power
security is WPA-personal, wpa2 only ,AES

dir-655 logs have nothing relevent , unless your interested in who connected and a long list of my sons WII connecting a lot.


When channel width = 20 MHZ , no problems detectable.
When channel width = 20/40 MHZ , problem is prevalent.


Again , problem only shows up on channel width = 20/40 MHZ , and large and constant data stream of a large file.

[davevt31]

Does it happen if router is switched to mixed n and g ?

[EddieZ]

Try updating to the 1.22b05 version and see if it is still the same. Also do a search  for the NIC chipset compatibilities, it may have issues with 40 mHz (or not support it). You can also set a channel manually, often that results in much better connections (different everywhere and also depending on surrounding AP's) than the auto-setting

[gajets]

since the dir-655 uses the same atheros AR5008 Xspan chipset as my card ,I can assume compatability. so that leaves me trying the firmware change...

[EddieZ]

since the dir-655 uses the same atheros AR5008 Xspan chipset as my card ,I can assume compatability. so that leaves me trying the firmware change...

Not if you haven't tried different channels setting. Do you have security enabled? Is the AR5418 chipset the same as the AR5008. The AR5418 is 802.11a/b/g/n which the DIR 655 is not...(b/g/n)

[Kanako]

You might get interference from other wireless signals around you. Try scanning to check if you can find a channel that is not used, or one that is less used than channel 6 at least.

[lotacus]

I tried reproducing your problem, and could not do so.

I think that one of the computer may be incompatible with the 40mhz width.

Could honestly be the drivers in your laptop. Try this. clear the log file, only have the two computers on. do the xfer, copy the log files and paste them here.

Maybe the log files will indicate something. if the router is rebooting the timestamp and such should be pre-pended with [warning] or [error] or something like that.

[gajets]

thanks for the attempts at help,
I have not really identified whether the problem is the router of the mini PCIe card,
 so I guess I will refrain till I evaluate this further, I Was hoping that someone else saw this issue. 
Thank anyway.