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13. Cable Diagnostics Commands11313.Cable Diagnostics CommandsThe commands are used to diagnose the link status, failure status, andpossible failure position of copper cabling connected to ports of thisSwitching Hub. After diagnosing open, short, and crosstalk of thecable, the cable length can be measured if there is no open or short.Optical fiber cables are not diagnosed.13.1. cable_diag ports DescriptionThis command is used to test copper cabling.For 10/100Based-TX link speed RJ45 cables, two pairs of cables will be diagnosed.For 1000Base-T link speed RJ45 cables, four pairs of cables will be diagnosed.The type of cable errors can be open, short, or crosstalk.• Open means that the cable in the error pair does not have a connection at thespecified position.• Short means that the cables in the error pair has a short problem at the specifiedposition.• Crosstalk means that the cable in the error pair has a crosstalk problem at thespecified position.For Fast Ethernet ports:• Where the link partner is powered on with no errors and the link is up, thiscommand cannot detect the cable length.• Where the link partner is powered on with errors, this command can detectwhether the error is open, short, or crosstalk. In this case this command can alsodetect the distance of the error.• Where the link partner is powered down with no errors and the link is down, thiscommand cannot detect the cable length.• When the link partner is powered down with errors, this command can detectwhether the error is open, short, or crosstalk. In this case this command can alsodetect the distance of the error.• When there is no link partner with no errors and the link is up, this command candetect the cable length.• When there is no link partner with errors, this command can detect whether theerror is open, short, or crosstalk. In this case this command can also detect thedistance of the error.cable_diag ports [ | all]ワヰヵユワヰヵユ
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