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Cable / Fiber Modem & ONT diagnostics

Test what the browser can see. Know when it cannot.

Use browser network evidence to determine whether the problem is local to one device or more consistent with the gateway, modem, ONT or ISP path.

Run these first

Relevant live checks

Browser Online Status TestCheck the browser online state, available connection hints, and a short round trip to DeviceOK.
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Browser Latency TestMeasure several browser-to-DeviceOK request round trips as a quick connection responsiveness check.
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Browser Network Timing Variation CheckRun repeated HTTP round trips to DeviceOK and show timing variation between samples.
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Public IP Address CheckSee the public-facing IP address DeviceOK receives for this web request.
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First diagnostic sequence

Do the high-signal checks before risky changes

  1. 1

    Check gateway/modem status lights against the provider manual

  2. 2

    Test another device on the same connection

  3. 3

    Contact the ISP when multiple devices fail and modem/ONT status indicates loss of service

What DeviceOK/browser can help check
  • Confirm web reachability
  • Time requests to DeviceOK
  • Show the public-facing address seen by DeviceOK
What this browser page cannot prove
  • Read DOCSIS or optical signal levels generically
  • See ISP provisioning state
  • Restart or reprovision protected provider equipment