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Slow transfer speeds over a wireless bridge

Discussion in 'General Wireless Discussion' started by DonWie63, Jan 15, 2013.

  1. DonWie63

    DonWie63 New Around Here

    Jan 15, 2013
    I have had three different 802.11AC wireless setups and they all have the same problem so I know it is not an issue with my current setup so I decided to post this question here in the general questions section so here it goes.
    My hardware is as follows:
    Cable modem connected to internet
    CAT 6 Ethernet cable from cable modem to First ASUS RT-AC66U Wireless 802.11AC Router
    CAT 6 Ethernet cable from AUS Router to Main PC
    Second ASUS RT-AC66U Wireless 802.11AC Router setup up as Wireless Bridge
    CAT 6 Ethernet cable from Second Router to Home Theater PC
    CAT 6 Ethernet cable from Second Router to Synology Diskstation DS +1812 networked hard disk

    Here is my problem - if I log into my "Main PC" and try to transfer files wirelessly from the "Main PC" to the Synology networked hard disk, I get transfer speeds around 4 MBps, way too slow. But if I login into my "Home Theater PC" and initiate the same transfer from my "Main PC" to the "Synology", I get a 40 MBps transfer speed. Am I missing something? Is there a setting I need to change?

    If there is any more info anyone needs just let me know.


  2. CaptainSTX

    CaptainSTX Very Senior Member

    May 2, 2012
    Test Signal Strength

    Use an application or program such as inSSIDer and check your signal strength and look for other nearby SSIDs.

    If necessary move antennas and even change locations of wireless equipment. Test using various channels. While 1,6 or 11 are often recommended sometimes another channel may work better.
  3. thiggins

    thiggins Mr. Easy Staff Member

    May 18, 2008
    I have seen much higher wireless throughput running uplink vs. downlink in AC and some "N900" routers. Compare the downlink chart for draft 11ac products with uplink. This is only a 2X difference, however.

    I asked about this phenomenon during my visits at CES this year. The explanation I got was that some of the processors that manufacturers are putting in draft 11ac routers don't have enough compute power to keep up with the demands of large file transfers on transmit. But since you are using the same product on both ends of your wireless connection, this doesn't explain what you are seeing.

    What are the processor, OS and memory configuration of your "Main" and "Home Theater" PCs? Also, how do you have your wireless configured?
  4. sfx2000

    sfx2000 Part of the Furniture

    Aug 11, 2011
    San Diego, CA
    Interesting problem...

    The HTPC to NAS, this is ethernet connection, so the bandwidth there is expected.

    Confirm that you're actually connected on the bridge in 5GHz between the two ASUS boxen - sounds like you might not be.

    As Tim also suggested - some of the early 802.11ac implementation - 600Mhz MIPS might not be enough horsepower - the SW stacks might not be completely optimized yet... I think there's a lot of work left to do there...
  5. tipstir

    tipstir Very Senior Member

    Aug 16, 2008
    South Florida
    802.11ac still in draft mode not standard yet so you have to overlook that, but what type of PC you have there as the Main PC.

    What OS?
    What NIC (network interface card)?
    Is the NIC on-the MOBO (motherboard)?
    Is the NIC in a slot?
    Does this NIC have TX and RX Buffering?
    Have you changed any settings on the Main PC?
    Are you just running the defaults on it?

    Is the Home Theater PC and the Main PC what is the difference between the two in and OS hardware wise?

    Every PC on your network should have the same type of tweaks. WiFi tweaks the defaults are okay for the NIC, but the TCP/IP for the OS should be tweak to match all PC. A lot of people don't even bother to off-load the CPU to use NPU instead to make transfers go faster.

    Another issue is the main PC HDD is that IDE or SATA which SATA is that first gen or second gen? Is that spinning at 7200rpm or 5400rpm. Is the NIC PCI or PCI-E. A lot of factors to consider.

    WiFi have you done a site to site survey to make sure the WiFi Signal is strong enough and has good quality to get to your clients devices. Bad signal can run into issues too.
  6. DonWie63

    DonWie63 New Around Here

    Jan 15, 2013
    Slow Transfer Speed

    I don't think I explained it as indepth as I should have, when I am sitting in front of my main pc, pc "A" and open explorer and copy files from pc "A" to NAS I get transfer speeds of about 4 MBps. When I log into pc "B" and open explorer and navigate wirelessly to the networked computers and click on pc "A" files and right click on them to copy and then paste them onto NAS I get transfer speeds of 40 MBps. Essentialy, the files are going the same route, it is just a different pc telling them to copy. In that instance I am not transferring between "B" and NAS. If I were to transfer between "B" and NAS I get around 80MBps which is normal. I just don't understand why the difference from the other transfer.

    Thanks for all the help, when I get home I will post all the specs for the other posters on this thread.

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