Streaming Audio to Airport Express with e3000 - I get Pauses

Discussion in 'Tomato Firmware' started by robertsm, May 25, 2012.

  1. robertsm

    robertsm Addicted to LI Member

    The problem: I have a Linksys E3000 (running E3000USB-NVRAM60K-1.28.7493MIPSR2-Toastman-RT-VPN) as a base station hooked up to 2 Airport Expresses via WDS. Wireless printing and internet work fine via the AE's, but audio streaming stutters/pauses every 30 seconds. What's interesting about that, is that it's not a random 30 seconds, when watching on my computer's clock, it happens at the 55 and 25 second marks… consistently.
    Additional Details on config:
    • I'm running the WDS on the 2.4GHz band, with no security, G wireless mode,
    • I access the router/network via the 5GHz band and/or Cat5. Doing this I'm still able to access the WDS network for wireless printing.
    • The 5GHz band is running WPA2 Personal with AES encryption.
    • Beacon interval is set to 25 (for both 2.4 & 5 GHz bands)
    • I don't have QoS enabled.
    • I just found out that when running the 2.4GHz band as AP+WDS I get pauses when accessing via 5GHz. When I change 2.4GHz to WDS only, wireless streaming through 5GHz works fine.
    Further clarification
    • I've tried changing wireless channels (EG 1, 5, 6, 11) for the WDS setup, with no change/benefit.
    • I DO NOT have this issue when…
      • I stream directly to the AE (i.e. not through the E3000 using WDS)
      • When I connect directly to the 2.4GHz band everything runs fine. This seems to only happen on PCs connecting by Cat5, as well as when I connect through the 5GHz band.
    • I'm currently using iTunes on Mac (5GHz band) and Win7 (Cat5) machines. After I get rid of the pause issue I'm planning on using Airfoil to stream Spotify from the Win7 pc.
    • So why the setup with separate bands with separate wireless modes? The Win7 pc is setup as a Plex server, so I want to have "N" speed for the wireless devices (laptops, iPad, etc). I can't run N speed through the WDS because the AEs are older G units.
    So, to me it seems like…
    • it's tied to some sort of clock cycle in the E3000?
    • something might be happening during the pass-off between wired and the 2.4GHz band?
    I dunno... I'm stumped. Thanks for any thoughts/input/help.
  2. gfunkdave

    gfunkdave LI Guru Member

    Each WDS connection halves your available bandwidth. Using 802.11G with two WDS connections will result in about 2.5 Mbps total available bandwidth (802.11G gets 54 Mbps only in a lab - 11 Mbps is about the real world max).

    Wire your AEs to the router or upgrade to an all-N network.
  3. robertsm

    robertsm Addicted to LI Member

    first: thanks for the reply.
    To be clear, though:
    • this happens even when I'm only using one AE on the WDS
    • this no longer occurs on the wireless streaming (i.e. streaming through the 5GHz N band). It only happens on the wired connection that's connected to the e3000 running the WDS on the 2.4GHz band.
    • it happens at specific clock times, irrespective of when I start the stream. That is, it's not occurring 30 seconds after I start the stream, it's happening at specific clock intervals no matter when I start the stream. So, if watch my digital clock and start the stream at any given time, the pauses will occur at the 25 & 55 sec marks on my clock.
    • The reduced bandwidth on the AE WDS network is why I'm only using that half of the e3000 (the 2.4GHz band) for music streaming and wireless printing on the WDS. I'm running N on the 5GHz network for the greater bandwidth for internet and plex (the plex server is connected via cat5 to the e3000).
    Sorry, I'm not understanding how the reduced bandwidth would cause this anomaly. Am I missing something?
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