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I have a Cisco E3200 Wireless N dual band router and external drive with USB2 support attached to it. The drive is shared across my network. My laptop has G WiFi adapter, so it can connect with 54Mbps only (which is ~6MB per second). I also have USB Wireless N adapter that supports up to 150Mbps.

When I copy my files from shared hard drive to my local folders it copies with speed 2.5MB/s and changing my WiFi adapter has no effect. It doesn't matter whether I am connected with 150Mbps or 54, the copying speed is the same - 2.5MB/s which is not enough for HD streaming; I have serious lag issues when I try to watch HD movies. When I disable WiFi and connect with a network cable, I see the speed is about 10-11MB/s - this is good enough. I can't understand what the problem is. Signal quality is 100%, security is WPA2 Personal.

  1. Why is there no difference between 54Mbps and 150Mbps?
  2. Why are files copied with a speed of 2.5MB/s in the 54Mbps network?
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migrated from stackoverflow.com Dec 9 '11 at 13:23

This question came from our site for professional and enthusiast programmers.

    
Can't you post not programming questions here? – axe Dec 2 '11 at 19:38
    
You can, but they will get magically migrated – Oleg Mikheev Dec 2 '11 at 19:39
    
Do you mean it's not allowed? I don't see where it says that this is only programming forum. I can see corresponding tags. Is there any other forum for that? – axe Dec 2 '11 at 19:41
1  
stackoverflow.com/faq – Oleg Mikheev Dec 2 '11 at 19:43
    
Thanks. Then where should I move it and how? – axe Dec 2 '11 at 19:44

This sounds like the case of a bottlekneck of your external drive.

It doesn't matter whether I am connected with 150mbps or 54, copying speed is the same - 2.5mb/s which is not enough for HD streaming,

Actually, this is fast enough, sounds like your issues have something to do with the channel though.

This router also uses both N and G...What I did was set the N channel to the lowest and the G channel to the highest. I am also going to guess that your dealing with a USB bottlekneck with the N Wireless Device.

How are you watching these streams? Your local device or a service like Netflix/Amazon/iTunes?

I am able to watch 1080p on my Xbox using this same router, have 5+ devices on it.

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This sounds like the case of a bottlekneck of your external drive. No, copy using network cable is fast enough, it goes up to 11mbs per second. – axe Dec 14 '11 at 12:53
    
I am also going to guess that your dealing with a USB bottlekneck with the N Wireless Device. It's a USB 2 device, it should allow up to 480mbps, but of course I'm not sure that my wireless N adapter is good. I would like to buy one, but as far as I see first wireless adapter that I tested did not match my requirements, so why should I think that another one will? – axe Dec 14 '11 at 12:54
    
How are you watching these streams? Your local device or a service like Netflix/Amazon/iTunes? My local hard drive. – axe Dec 14 '11 at 12:55

The Router: Little known fact about most wireless routers is that they are "oldest technology wins" This means if you have a single band router and there is the presence of a wireless-G device then that sets the wireless protocol for ALL devices to wireless-G. The only routers that work around this are the multiband routers where you have to set up two SSIDs (one typically is defaulted as " 5g" (ex: Nexus 5G). Your best bet for a fast data transfer is to set the WiFi to 'N-only' and connect the 'G' laptop to an Ethernet port.

The USB: USB 1.1 have a limit of about 12 Mbit/s (1.5 MB/s) check that the device that you are plugged into can support the USB2 device you are plugging into it.

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