Fun fact - cable testing

cmr
Kind of a big deal
Kind of a big deal

Fun fact - cable testing

If you ever perform a cable test on a port that is down and you see something like the below, it means that there is a device on the other end, in my case another Meraki switch, that has no power to it:

cmr_0-1728936752617.png

This is what the same cable test looks like with the remote switch powered back up:

cmr_1-1728936821000.png

Just in case anyone wonders why they suddenly have a failed cable with open and abnormal pairs! 

 

 

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3 Replies 3
JGill
Building a reputation

That is odd.  We normally see the cable length to the device powered down.   Can't say I've tried it with a down steam Meraki switch.  Good to know!   

JGill_0-1728937724278.png

 

RWelch
Head in the Cloud

It appears in the example above that the cable length grew .75m when the device was powered on. 😆

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cmr
Kind of a big deal
Kind of a big deal

The electron flow stretched the cable, before it was just relaxing 😉

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