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25D-Link DGS-1016D/DGS-1024D User Manual
Section 4 - Cable Diagnostics
Cable Diagnostics
The Cable Diagnostics function helps network administrators to diagnose network connectivity issues. This function is initialized
when the switch is rst powered on. Each port is scanned to determine if the Ethernet cable and connectors are in good working
order. This diagnostic test looks for two types of common faults in Ethernet cable: an open circuit or a short circuit. An open
circuit is usually caused by a lack of continuity between the pins at each end of the Ethernet cable or a disconnected cable,
while a short circuit occurs when two or more conductors have an unintended connection. Either of these common cable
faults will be detected by the Cable Diagnostics function.
During the diagnostics the LED for each port blinks green in sequential order. If a cable fault is detected, the corresponding
port’s Link/Act/Speed LED will light amber. Once the cable diagnostic function has completed, the switch then proceeds with
normal operation.
NOTE: the Cable Diagnostics function does not detect the length of Ethernet cabling. Remember that the length of
cabling between two Ethernet devices may not exceed 100 meters (or 300 feet).
Link/Act/Speed LED Color Status
Green No Fault/Good Cable Connection
Amber Open or Short Circuit
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