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I have cable and internet service with Comcast. I'm experiencing really slow speeds when an HD channel is on on my TV. I thought this may have to do with my splitter, but I foudn that this happens only when I'm using wireless though. When my laptop is directly connected to the cable modem, the speed is fine even when the HD channel is on. My setup is this:

  • Cable from the wall is connected to a splitter
  • On the other end of the splitter, from one side, a cable goes into the internet cable modem, and from the other it goes to my TV Comcast Cable box (HD).
  • An Ethernet cable goes from my cable modem to my Dlink wireless router.
  • An Ethernet cable goes from my wireless router to a PlayStation, and another cable goes to a vonage device.

What could be the problem? How is my wireless getting affected when my TV channel is on? I don't see any relation here.

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closed as off topic by jscott, Holocryptic, voretaq7, Oskar Duveborn, RobM May 25 '11 at 16:18

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Have you spoken to Comcast about this? – voretaq7 May 25 '11 at 16:13
Yeah I did but they will help only when wireless is not in the equation--and when I remove the wireless router from the setup, everything is fine. – Prabhu May 25 '11 at 16:20
it's probably something with your wireless router (or the device connecting to it, ex. your laptop). Your wireless isn't Comcast's responsibility and there's very little chance that your TV or Cable Box is interfering with your wireless, though it's possible. – Chris S May 25 '11 at 17:30
@Chris That's what I thought too but then my wireless is fine when a HD channel is not there is some relationship between the two. It's not so bad when a non-HD channel is on. – Prabhu May 25 '11 at 17:44
The only possible relationship would be the Cable box putting noise on the line when in digital mode, but that would affect your Internet service using wired or wireless connection equally. – Chris S May 25 '11 at 19:40

Not sure this is the right forum, but it may not due to your wireless specifically, but rather your entire Internet being affected by your cable connection having a problem. I would do a speed test while wired with HD on and off and see if the problem is more widespread than just your wireless. If that turns out to be the case, call your cable company.

Also, one more thing comes to mind: Some new TVs can connect to your WAP. Make sure that yours is not.

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I did a speed test when directly connected and it's normal. Only with wireless am I getting slower speeds. – Prabhu May 25 '11 at 16:18

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