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Cisco Meraki

Using the Cable Test Live tool

Cisco Meraki MS switches have per-port cable testing capabilities. This can used to troubleshoot a faulty cable or estimate cable length.

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Make sure the cable is connected to devices at both ends, before running this test.

To perform a cable test using Dashboard, navigate to Monitor > Switches > choose a switch > Tools. Then, scroll to the "Cable Test" tool section. Next, enter the port or port range (ie. "1" or "1-24" without quotes) into the test window and click the Run cable test button.



Once the Run cable test button is clicked, you can receive one of several test result outputs:



Good cable and good pair


Unused or terminated pair


The impedance* is not within the expected bounds, either too high or too low


Specified pair too strongly coupled to pair X, indicating a high amount of crosstalk

*Proper termination of Cat5/6 cable requires a 100Ω differential impedance between the positive and negative cable terminals. The IEEE 802.3 allows for a termination of as high as 115 Ω or as low as 85 Ω. If the termination falls outside of this range, it is reported by the cable diagnostics as an anomalous termination.


Example of a cable test output: 



The cable test will also output which pair is open if you have an open pair on your Ethernet cable. The diagram below illustrates how the pairs are numbered in a T568B straight through cable RJ-45 pinout.




This cable test allows for the ability to eliminate common layer 1 cabling issue by outputting cable length and testing the status of each cable pair.


For more information, see Cable Testing using the Meraki MS Ethernet Switch.

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