Forum Thread

Asus rt-n16 Poor Wireless Performance

BiG DoGN12 4,866 2,235 February 16, 2011 at 11:50 PM
Hi eveyrone,

I apologize for the lengthy explanation, but I wanted to cover everything and my trouble-shooting steps.

Is there something wrong with my RT-N16?

I'm 5 feet away from the router on my G-enabled laptop.

Stock Asus firmware, wireless shows at 54.0 mbps tha to 11.0 mbps than eventually progresses to less than 8.0 mbps. This in the timeframe of less than 10 minutes.

DD-wrt firmware 14896, defaults settings, nothing changed, even using the dd-wrt ssid, similar trend.

I've tried multiple laptops. Speedtest.net shows as less than 2.0 mbps download speed. DD-wrt firmware shows TX power as default 17 mW, compared to dd-wrt on my linksys wrt54g where TX power shows as default 71 mW.

My wired desktop to this same router, running speedtest.net using the same server shows download speed of 35.0 mbps; a significant difference.


I have my TP LINK wr1043nd router that is being replaced by this Asus rt-n16 router. Both the stock TP link firmware and the dd-wrt firmware did not have these issues with wireless. Same wireless channel, SSID, etc.

On the ASUS, I've tried mixed mode, BG-mode, and G-mode; on both stock and dd-wrt with similar results.

What is the issue? Did I receive a lemon? Anyone else have these similar issues?

EDIT: I just tried dd-wrt 15508 and am experiencing the same issues.

11 Comments

1

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#2
Wireless chip overheating might be the culprit here. See if you can open the cover of the router and use a small usb fan blow on it before you turn the router on and measure the wireless speed.

Ref:
http://www.dd-wrt.com/phpBB2/view...edba03d393


Normally I don't compare wired and wireless speed but in this case since they are on separate chips it makes sense that the wireless(radio) chip overheats and only affects the wireless speed.
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Last edited by teetee1 February 17, 2011 at 03:52 AM
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#3
Quote from teetee1 View Post :
Wireless chip overheating might be the culprit here. See if you can open the cover of the router and use a small usb fan blow on it before you turn the router on and measure the wireless speed.

Ref:
http://www.dd-wrt.com/phpBB2/view...edba03d393


Normally I don't compare wired and wireless speed but in this case since they are on separate chips it makes sense that the wireless(radio) chip overheats and only affects the wireless speed.
Could be overheating but since this is a new router I doubt it. This model had overheating issues in its early release but it was quickly changed and its not be a factor for a while now. Plus opening the router and voiding the warranty should be his last option as he then cant return it or get service.

I own this router bought in November and experienced poor performance with the stock firmware, random disconnects, slowdowns etc. I am a fan of TomatoUSB and flashed to it. Since doing this it has been rock solid and strong. I would recommend doing this.

You could also contact ASUS support, my guess is that they will RMA the router.

In DD-WRT what do you have your transmit power set to? Have you done a site survay to see if other networks are on the same channel? Have you verified files actually slow down in transmit speed and its not just displaying something that is just a display?
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#4
Why would you replace a TL-WR1043ND that works fine with a RT-N16? What does the RT-N16 do that the TL-WR1043ND doesn't?

This is a rhetorical question. The main difference is the ability to run Tomato on the RT-N16 which you don't seem to have done. Other than that, the RT-N16 just has more RAM and Flash. The TL-WR1043ND is a very capable router.
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#5
try tomato, and do a full reset afterwards. then try your speed tests
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#6
Quote from fyu View Post :
try tomato, and do a full reset afterwards. then try your speed tests
And by full reset he means NVRAM clear and restart.
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#7
Quote from LiquidRetro View Post :
In DD-WRT what do you have your transmit power set to? Have you done a site survay to see if other networks are on the same channel? Have you verified files actually slow down in transmit speed and its not just displaying something that is just a display?
Overheating is a valid point, but I don't think it would overheat so quickly; especially in less than 5 minutes.

Transmit power is set to default, which the firmware gui shows 17 mW. Reading the dd-wrt forums, it is in fact a typo and is really 17 dB. Yes, I've done site survey, crowded bands 1 and 11, with band 6 being the most suitable. Speed is in fact slow, as seen loading up slickdeals.net, m.slickdeals.net, and running speedtest.net, even youtube. I may have made some progress, seems like putting the router in "G-mode" in both the stock ASUS firmware and the dd-wrt firmware may possibly be the culprit. I tried AUTO today and it seems better? I currently do not have any N nor legacy B devices, and therefore my reasoning for choosing G-mode.

Quote from fyu View Post :
try tomato, and do a full reset afterwards. then try your speed tests
I've never tried Tomato, I have experience with DD-WRT on many routers. Tomato is not out of the question though. I'm just curious why even the stock firmware exhibits these slow wireless speeds.

On another note, I'm not stating a "subjectively" slow. I have a reference point, and that is speeds with my tplink router, and speeds on wired. Thank you for any input.
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Last edited by BiG DoGN12 February 17, 2011 at 11:50 AM
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#8
Quote from BiG DoGN12 View Post :
Overheating is a valid point, but I don't think it would overheat so quickly; especially in less than 5 minutes.

Transmit power is set to default, which the firmware gui shows 17 mW. Reading the dd-wrt forums, it is in fact a typo and is really 17 dB. Yes, I've done site survey, crowded bands 1 and 11, with band 6 being the most suitable. Speed is in fact slow, as seen loading up slickdeals.net, m.slickdeals.net, and running speedtest.net, even youtube. I may have made some progress, seems like putting the router in "G-mode" in both the stock ASUS firmware and the dd-wrt firmware may possibly be the culprit. I tried AUTO today and it seems better? I currently do not have any N nor legacy B devices, and therefore my reasoning for choosing G-mode.


I've never tried Tomato, I have experience with DD-WRT on many routers. Tomato is not out of the question though. I'm just curious why even the stock firmware exhibits these slow wireless speeds.

On another note, I'm not stating a "subjectively" slow. I have a reference point, and that is speeds with my tplink router, and speeds on wired. Thank you for any input.
I dont remember if this router has an amp in it or not but if it does that is a pretty low signal strength. Ya I dont understand why most routers ship with such crappy firmware either. I did read about some people having issues putting DD-WRT on this router this is why I went with TomatoUSB. They look a bit different but function the same. If you understand DD-WRT you will pickup tomato fast.

Important note, the official release of Tomato is not supported by this router you need to use one of the other builds. The most popular being TomatoUSB.
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#9
17dB would be about ~55mW.

At 17dB or 17mW what happens when you move farther than 5 feet from the antenna(s)? Up the Tx to 50?? and repeat test.

How about updated wireless NIC drivers? I see it works well with the 'old' router, but not the 'new'.
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#10
Has anyone ever found a solution to this problem? I also got an rt-n16 back on some deal and am finding its wireless is about 1/3 the speed of its wired connection as shown by Ookla speed tests. I almost always use wired so I have not noticed till now.
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#11
Quote from BiG DoGN12 View Post :
I've never tried Tomato, I have experience with DD-WRT on many routers. Tomato is not out of the question though. I'm just curious why even the stock firmware exhibits these slow wireless speeds.

On another note, I'm not stating a "subjectively" slow. I have a reference point, and that is speeds with my tplink router, and speeds on wired. Thank you for any input.
I have tomato on my N16 and it is definitely the way to go.

http://tomatousb.org/
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