Not trying to necro a post, but I came across this thread trying to figure out an XXX result that we received from a cable test on pair 2 when troubleshooting a device not connecting to the switch and this post was the only reference I found to it. I contacted support, and they gave me the following answer: "XXX means pair 2 are failed to report voltage for unknown reason." Hope this helps if anyone else comes across this. We're pretty sure the contractor installed two bad cables (the other one shows open on pair 4, so we have to force it onto 100Mbps), so we believe the result is likely accurate.
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