Interlogix NS3500-28T-4S User Manual - Manual (Page 337)

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4.13.1 Cable Diagnistics
The Cable Diagnostics performs tests on copper cables. These functions have the ability to identify the cable length
and operating conditions, and to isolate a variety of common faults that can occur on the Cat5 twisted-pair cabling.
There might be two statuses as follow:
 If the link is established on the twisted-pair interface in 1000Base-T mode, the Cable Diagnostics can run
without disruption of the link or of any data transfer.
 If the link is established in 100Base-TX or 10Base-T, the Cable Diagnostics cause the link to drop while the
diagnostics are running.
After the diagnostics are finished, the link is reestablished. And the following functions are available.
 Coupling between cable pairs.
 Cable pair termination
 Cable Length
Cable Diagnostics is only accurate for cables of length from 15 to 100 meters.