How to Test Internet Signal Strength

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If you're having problems with your Internet connection, you may need to check your cable modem's Internet signal strength. Low power levels or a low signal-to-noise ratio (SNR) may cause your cable modem to perform poorly. On most modems, you can check the diagnostic page and record the overall signal strength.

This information can be used by a trained service technician to diagnose any wiring or connection issues that may be affecting the Internet signal strength.

Open your Internet browser. In the address bar, type "" and press "Enter." Most Internet modems use this address for accessing the diagnostic page.

Locate the signal-to-noise ratio (SNR) and power level for both upstream and downstream channels. Write these values down on a piece of paper.

Consult a trained service technician and provide the recorded values for both upstream and downstream channels. This information can be used to properly diagnose the Internet modem.