3Com MSR 50, MSR 30 manual Parameter None, 185

185

Parameter None

Description Use the virtual-cable-testcommand to enable the virtual cable test for an Ethernet interface and to display the testing result. The tested items include:

■Cable status: Could be normal, abnormal, abnormal-open, abnormal-short, and failure;

■Cable length;

■Pair Impedance mismatch;

■Pair skew;

■Pair swap;

■Pair polarity;

■Insertion loss;

■Return loss;

■Near-end crosstalk.

By default, virtual cable test is disabled.

Note:

■When the cable is functioning properly, the cable length in the test result represents the total cable length;

■When the cable is not functioning properly, the cable length in the test result represents the length from the current interface to the failed position.

n ■ The optical interface of a Combo port does not support this command.

■A link in the up state goes down and then up automatically if you execute this command on one of the Ethernet interfaces forming the link.

Example # Enable the virtual cable test for the interface Ethernet 1/0.

<Sysname> system-view

[Sysname] interface ethernet 1/0 [Sysname-Ethernet1/0] virtual-cable-test Cable status: abnormal(open), 7 metres Pair Impedance mismatch: yes

Pair skew: 4294967294 ns

Pair swap: swap

Pair polarity: normal

Insertion loss: 7 db

Return loss: 7 db

Near-end crosstalk: 7 db