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SBG7580-AC - slow speed and not compatible with ISP

T
The Many
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I have cox internet service, the modem I have has been working great. Recently cox sent me information telling me it was out dated. I had 1GB service for years. Cox has upgraded to 2GB service and now my modem barley get to 100gb downloads. My streaming services will quit working. Cox tells me I need new modem to fix issue. I am only paying for 500GB service and barley use 300 GB per month.

Best answer by SURFboard Moderator

Could you let me know the current LED light status on the modem?

Are the Wi-Fi networks showing up on your devices?

Please note that the SBG7580-AC is not compatible with speeds up to 2 Gbps. I recommend contacting your service provider to downgrade your speed plan to around 300–400 Mbps for optimal performance.

 

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3 replies

S
Wi-Fi Warriors
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Could you let me know the current LED light status on the modem?

Are the Wi-Fi networks showing up on your devices?

Please note that the SBG7580-AC is not compatible with speeds up to 2 Gbps. I recommend contacting your service provider to downgrade your speed plan to around 300–400 Mbps for optimal performance.

 

SURFboard Community Moderator Team
T
The Many
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  • TeetheriotThe Many
  • Author
  • The Many
  • 1 reply
  • April 15, 2025

I have 500mb service and was only getting 80 to 90mb. I did a complete power down and reset and it is now back to 500mb downloads. Is it still required to change out modem if I only need 500mb downloads.

S
Wi-Fi Warriors
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Since you're getting good speeds after resetting the modem, I recommend monitoring the performance for now.

If the issue persists, try changing the Wi-Fi channels as a next step.

To do this:

  1. Open a web browser and enter 192.168.0.1 in the address bar.

  2. Log in using your credentials.

  3. Go to Basic Setup > select Wireless 2.4 GHz and change the Wi-Fi channel to 1, 6, or 11.

  4. Do the same for 5 GHz, with suggested channels being 36, 48, 153, or 161.

 

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