Chapter 4: Web configuration 
282  NS3552-8P-2S-V2 User Manual 
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 states, which 
are as follows: 
•  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. A 
1000Base-T Laptop/PC is preferred for testing the cable diagnostic function. 
•  If the link is established in 100BASE-TX or 10BASE-T, the cable diagnostics cause 
the link to drop while the diagnostics are running. This may require the following 
steps: 
•  Select the Auto Refresh check box. 
•  Click the Fresh button 45 seconds after the cable diagnostic function has 
started. 
After the diagnostics are finished, the link is re-established and the following functions 
are available. 
•  Coupling between cable pairs 
•  Cable pair termination 
•  Cable length 
 
The page includes the following fields: 
 
Object  Description 
Port  The port where you are requesting cable diagnostics. 
Cable Status  Port: Port number. 
Pair: The status of the cable pair. 
Length: The length (in meters) of the cable pair. The resolution is 3 meters 
Buttons 
•  Click Start to run the diagnostics.