DWS-3160 Series Gigabit Ethernet Unified Switch CLI Reference Guide
156
Chapter 14
Cable Diagnostics
Command List
cable_diag ports
[<portlist> | all]
14-1
cable_diag ports
Description
This command is used to run a cable diagnostics report for all the ports or only for selected ports
on this Switch. For Fast Ethernet ports, two pairs of the cable will be diagnosed. For Gigabit
Ethernet ports, four pairs of the cable will be diagnosed. The type of cable error can be open, short,
or crosstalk.
1. Open means that the cable in the error pair does not have a connection at the specified
position.
2. Short means that the cables in the error pair has a short problem at the specified position,
3. Crosstalk means that the cable in the error pair has a crosstalk problem at the specified
position.
When a port is in link-up status, the test will obtain the distance of the cable. Since the status is
link-up, the cable will not have the short or open problem. But the test may still detect the crosstalk
problem.
When a port is in link-down status, the link-down may be caused by many factors.
•
When the port has a normal cable connection, but the remote partner is powered off, the
cable diagnosis can still diagnose the health of the cable as if the remote partner is
powered on.
•
When the port does not have any cable connection, the result of the test will indicate no
cable.
•
The test will detect the type of error and the position where the error occurs.
NOTE:
This test will consume a low number of packets. Since this test is for copper
cables, the ports with fiber cables will be skipped from the test. For combo port, the
test will always be applied to the copper media only.
Format
cable_diag ports [<portlist> | all]
Parameters
<portlist>
- Enter a list of ports used for the configuration here.
all
– Specifies that all the ports will be used for this configuration.
Restrictions
Only Administrators, Operators and Power-Users can issue this command.
