Skip to content
Any configuration changes made locally on the switch won't be synchronized with Sophos Central. We recommend making changes from the Sophos Central control panel instead.

Page permalink

Always use the following permalink when referencing this page. It will remain unchanged in future help versions.

https://docs.sophos.com/nsg/switch/help/en-us/index.html?contextId=user-guide-features-analyze-diagnostic-tools-cable

Cable Diagnostics

Cable Diagnostics helps you to detect whether your cable has connectivity problems and provides information about where errors have occurred in the cable. The tests use Time Domain Reflectometry (TDR) technology to test the quality of a copper cable attached to a port. TDR detects a cable fault by sending a signal through the cable and reading the reflected signal. All or part of the signal is reflected back either by cable defects or by the end of the cable and shows when an issue is present. Cables are tested when the ports are in the down state, except for the cable length test.

To verify the accuracy of the test, we recommend that you run multiple tests in case of a test fault or user error.

Click Test to perform the cable tests for the selected port.