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13.Cable Diagnostics Commands
The commands are used to diagnose the link status, failure status, and
possible failure position of copper cabling connected to ports of this
Switching Hub. After diagnosing open, short, and crosstalk of the
cable, the cable length can be measured if there is no open or short.
Optical fiber cables are not diagnosed.
cable_diag ports [<portlist> | all]
13.1. cable_diag ports
Description
This 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 the
specified position.
• Short means that the cables in the error pair has a short problem at the specified
position.
• Crosstalk means that the cable in the error pair has a crosstalk problem at the
specified position.
For Fast Ethernet ports:
• Where the link partner is powered on with no errors and the link is up, this
command cannot detect the cable length.
• Where the link partner is powered on with errors, this command can detect
whether the error is open, short, or crosstalk. In this case this command can also
detect the distance of the error.
• Where the link partner is powered down with no errors and the link is down, this
command cannot detect the cable length.
• When the link partner is powered down with errors, this command can detect
whether the error is open, short, or crosstalk. In this case this command can also
detect the distance of the error.
• When there is no link partner with no errors and the link is up, this command can
detect the cable length.
• When there is no link partner with errors, this command can detect whether the
error is open, short, or crosstalk. In this case this command can also detect the
distance of the error.
13. Cable Diagnostics Commands
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