Chapter 12 Cable Diagnostics Command List - D-Link DGS-1510/ME Series Reference Manual

Chapter 12 Cable Diagnostics Command List

cable_diag ports [<portlist> | all]
12-1 cable_diag ports
Description
This command is used to configure cable diagnostics on ports. For FE port, two pairs of cable will be diagnosed.
For GE port, four pairs of cable will be diagnosed.
The following test result can be displayed.
•
Open - The cable in the error pair does not have a connection at the specified position.
•
Short - The cable in the error pair has a short problem at the specified position.
•
Crosstalk - The cable in the error pair has a crosstalk problem at the specified position.
•
Shutdown - The remote partner is powered off.
•
Unknown - The diagnosis does not obtain the cable status. Please try again.
•
OK - The pair or cable has no error.
•
No cable - The port does not have any cable connected to the remote partner.
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.
1. 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.
2. When the port does not have any cable connection, the result of the test will indicate no cable.
3. The test will detect the type of error and the position where the error occurs.
When the link partner is 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
When the link partner is Gigabit Ethernet ports:
DGS-1510/ME Series Metro Ethernet Switch CLI Reference Guide
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