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Apple devices extremely sluggish with Motorola SBG6580 modem

35468 Views 40 Replies Latest reply: Nov 30, 2012 5:48 AM by psteinkr RSS
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tasiv Calculating status...
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Dec 6, 2010 9:47 AM
All of my Apple devices (2 iMacs, an iPad and 2 iPhones) when connected to a new Motorola modem SBG6580 Time Warner installed experience frequent slow-downs to dial-up speeds; at other times work fine. My iMacs are directly Ethernetted into the Time Capsule; the iPad and iPhones operate via my WiFi network created by the Time Capsule. Ironically, my ancient Windows-based laptop when connected directly to the modem experiences NO PROBLEM. I tried connecting my iMacs directly into the modem (bypassing the Time Capsule) but that does not cure the severe bottlenecks.

Has anyone else had this problem? The Motorola modems are new and are designed for ulta-highspeed broadband so there many not be many of you out there with this modem in use with your Apple products.
iMac, Mac OS X (10.6.5), See above
  • Bob Timmons Level 9 Level 9 (75,470 points)
    I haven't tried this particular model of modem, but will note that cable modems in general always need a complete reset whenever any type of changes are being made on the network. If you have been connecting different devices to the modem, this may help get things going again.

    If you haven't already done this, push the reset button on the modem and power it off. Pull the internal battery on the modem if its easily accessible. Leave the modem powered down 20-30 minutes.

    Power off everything else on the network as well

    After the power down period, power up the modem first and let it run for a few minutes by itself. Then start the next device that is connected to the modem the same way. Keep powering up devices one at a time until everything is back up

    See if that provides any help.

    If not, the next step would be to reset the Time Capsule back to factory defaults (to clear out any old and possibly conflicting settings) and reconfigure the device again.
    MacBook Pro, iMac, Mac OS X (10.6.5), Time Capsule, AirPort Extreme, AirPort Express, iPhone
  • Bob Timmons Level 9 Level 9 (75,470 points)
    Sorry that this did not work. I think it's at the point where you may want to take the Time Capsule to an Apple store to have it checked out (where it will probably operate just fine). If that's the case, then check with Apple Support or Motorola to see if there are any known compatibility issues between the modem and Apple operating system.

    Message was edited by: Bob Timmons
    MacBook Pro, iMac, Mac OS X (10.6.5), Time Capsule, AirPort Extreme, AirPort Express, iPhone
  • Bob Timmons Level 9 Level 9 (75,470 points)
    Thanks for the info. This will certainly help other users who may have this modem and experience the same kind of problems. Clearly a case of nothing wrong with either the Time Capsule or the modem, just a compatibility issue between the two.

    Glad that you did not have to take the Time Capsule to the Apple store, where it would of course have performed perfectly.
    MacBook Pro, iMac, Mac OS X (10.6.5), Time Capsule, AirPort Extreme, AirPort Express, iPhone
  • Bob Timmons Level 9 Level 9 (75,470 points)
    More good info, thanks.

    It is nice to see that the provider stepped up to help, rather than offer the usual "everything looks good from our end" answer from tech support.
    MacBook Pro, iMac, Mac OS X (10.6.5), Time Capsule, AirPort Extreme, AirPort Express, iPhone
  • saturnino3 Calculating status...
    THANK YOU THANK YOU!!!

    I had the same issue in San Diego, CA using Cox Cable. My previous router died so I bought the Motorola 6580 and had the same issues -- MacBook with fresh install was sluggish over wifi and plugged in. iTunes did not have many issues but still slow.

    I checked my iPhone 4 and it was connecting quite well which led me to this website. Removed the firewall protections on the Motorola router, unplugged it and now I'm getting 40-50 MBPS over wifi!!!

    Spoke to 4 Cox techs who had no idea other than reset the modem.
    iMac C2D 1.83 17" & MacBook Unibody White, Mac OS X (10.6.5)
  • bsmooth Calculating status...
    I just bought the Motorola 6580. My question is that if I disable the Firewall on the modem, Where would I receive my firewall protection?
    iOS 4
  • Bob Timmons Level 9 Level 9 (75,470 points)
    The Time Capsule has a well designed NAT firewall.

    Message was edited by: Bob Timmons
    MacBook Pro, iMac, Mac OS X (10.6.6), Time Capsule, AirPort Extreme, AirPort Express, iPhone
  • bsmooth Level 1 Level 1 (0 points)
    Im not using Time Capsule. Is this issue only when using Time Capsule?
    iOS 4
  • Bob Timmons Level 9 Level 9 (75,470 points)
    The Time Capsule and the AirPort Extreme are basically the same router, except the Time Capsule has a built in hard drive, so this discussion would apply to those products only...unless other users come forth with information about other products.
    MacBook Pro, iMac, Mac OS X (10.6.6), Time Capsule, AirPort Extreme, AirPort Express, iPhone
  • bsmooth Level 1 Level 1 (0 points)
    The idea of me purchasing a Cable Modem Gateway was to avoid having multiple devices connected to receive WiFi for my Pro. Hopefully this will not be an issue to connect.
    iOS 4
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