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Cable Diagnostic
Upon booting up the Switch, a Cable Diagnostic is used to detect three
problems that may prevent successful connection. This feature operates
only on ports that are connected to 1000Mbps devices. If there are
problems on a port connected to a Gigabit Ethernet device (1000Mbps),
try restarting the Switch and watch the speed (100/1000Mbps) LED
indicators to determine is the problem is a fault in the cable or connecting
hardware. For ports operating at 10 or 100Mbps, the LED indicators can
be used for less specific troubleshooting.
The faults detected by the cable diagnostic for 1000Mbps operation are as
follows:
• Open circuit - a lack of continuity between the pins at each end of the
Ethernet cable or a disconnected cable.
• Short circuit - two or more conductors short-circuited.
• Connectivity is checked for each of the eight wires of a cable to
ensure its capability for running 1000Mbps.
During the diagnostic, each port is scanned to determine if the Ethernet
cable and connectors is in good working order. During the diagnostic
process the speed LED for each port blinks green in sequential order. This
port scan takes about 3 seconds. If a cable fault is detected, the
corresponding port’s speed LED will light amber for 5 seconds. The
Switch is then reset for normal operation. It takes about 2 seconds for the
Switch to reset. The entire Cable Diagnostic process takes about 10
seconds from the time the Switch is powered on.
The table below summarizes Cable Diagnostic information.
NOTE: the cable diagnostic 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).