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DGS-3600 Series Layer 3 Gigabit Ethernet Managed Switch CLI Manual
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CABLE DIAGNOSTICS COMMAND LIST
The Cable Diagnostics commands in the Command Line Interface (CLI) are listed (along with the appropriate
parameters) in the following table.
Command Parameters
cable_diag ports [<portlist> | all]
Each command is listed, in detail, in the following sections.
cable_diag ports
Purpose This command is used to configure the cable diagnostics.
Syntax
cable_diag ports [<portlist> | all]
Description For FE port, two pairs of cable will be diagnosed. For GE port, four pairs of cable will be
diagnosed. The type of cable error 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.
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.
Note that 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. For combo port, the test will always be
applied to the copper media only.
Parameters
<portlist> - Enter a list of ports used for the configuration here.
all – Specifies that all the ports will be used for this test.
Restrictions Only Administrator and Operator-level users can issue this command.
Example usage:
Test the cable on port 1-2: