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xStack® DGS-3420 Series Layer 2 Managed Stackable Gigabit Switch CLI Reference Guide
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• 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.
The Cable length range that can be detected is as follows:
• Smaller than 50m (<50m)
• Between 50m and 80m (50m~80m)
• Between 80m and 100m (80m~100m)
• Greate than 100m (>100m)
The cable length deviation value is 5m, therefore if the cable length is lest than 5m, ‘No Cable’
may be displayed under the ‘Test Result’ column.
Note: This test will consume a low number of packets. Since this test is for copper cable,
the port with fiber cable will be skipped from the test.
Format
cable_diag ports [<portlist> | all]
Parameters
<portlist> - Specify a range of ports to be configured.
all – Specify to set all ports in the system.
Restrictions
Only Administrator, Operator and Power-User level users can issue this command.
Example
To test the cable on ports 1 to 4, and 8: