D-Link dgs-1016d/g [16/41] Cable diagnostic

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).