3com S7906E Guide De Référence

 

1-35 

Layer 2 Ethernet interface view 

2: System level 

None 

Use the virtual-cable-test command to test the cable connected to the Ethernet interface once and to 

display the testing result. The tested items include: 

Note that: 

z 

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

length; 

z 

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. 

 

z 

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

Ethernet interfaces for this command varies with device models. 

z 

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. 

z 

The test result is for your information only. The maximum error in the tested cable length is 5 m. A 

hyphen “-” indicates that the corresponding test item is not supported. 

 

# Enable the virtual cable test for the interface Ethernet 2/0/1. 

<Sysname> system-view 

[Sysname] interface ethernet 2/0/1 

[Sysname-Ethernet2/0/1] virtual-cable-test 

Cable status: normal, 1 metres 

Pair Impedance mismatch: - 

Pair skew: - ns 

Pair swap: - 

Pair polarity: - 

Insertion loss: - db 

Return loss: - db