Management Guide - Kamery IP

3Configuring the SwitchPerforming Cable DiagnosticsYou can use cable diagnostics to test the cable attached to a port. The cable test willcheck for any cable faults (short, open, etc.). If a fault is found, the switch reports thelength to the fault. Otherwise, it reports the cable length. It can be used to determinethe quality of the cable, connectors, and terminations. Problems such as opens,shorts, and cable impedance mismatch can be diagnosed with this test.Command Usage• Cable diagnostics are performed using Time Domain Reflectometry (TDR) testmethods. TDR analyses the cable by sending a pulsed signal into the cable, andthen examining the reflection of that pulse.• This cable test is only accurate for cables 7 - 140 meters long.• The test takes approximately 5 seconds. The switch displays the results of the testimmediately upon completion, including common cable failures, as well as thestatus and approximate length to a fault.• Potential conditions which may be listed by the diagnostics include:• OK: Correctly terminated pair• Open: Open pair, no link partner• Short: Shorted pair• Test failed: This message is displayed for any Fast Ethernet ports that are linkedup, or for any Gigabit Ethernet ports linked up at a speed lower than 1000 Mbps.• Impedance mismatch: Terminating impedance is not in the reference range.• Ports are linked down while running cable diagnostics.Command AttributesThese parameters are displayed in the web interface:• Port – Switch port identifier. (Range: 1-28)• Type – Displays media type. (FE – Fast Ethernet, GE – Gigabit Ethernet)• Link Status – Shows if the port link is up or down.• Test Result – The results include common cable failures, as well as the status andapproximate distance to a fault, or the approximate cable length if no fault is found.• Last Updated – Shows the last time this port was tested.3-180