The VCT function controls the hardware interfaces and displays the cable status on the GUI so that you can conveniently and quickly locate faults and check lengths of cables.
Context
The VCT function helps to detect the type of a network cable fault and locate the faulty point. In this manner, network cable faults can be conveniently located.
- If the cable works properly, the total length of the cable is displayed.
- If the cable cannot work properly, the distance between the interface and the fault point is displayed.
The VCT test result is only for reference and may be inaccurate for cables of some vendors.
VCT takes effect only on optical interfaces that have GE copper modules installed or GE electrical interfaces on the device.
Procedure
- Click Maintenance in the function area and choose from the navigation tree in the left. The VCT is displayed.
- Select the interface that you want to configure. Perform
either of the following operations as required.
- Click an interface icon to select an interface.
- Click Start.
NOTICE: After you click Start, the message "The operation may cause Web NMS disconnected from the server. Continue?" is displayed on the system. Exercise caution when you perform this operation.
- Click Confirm. The check result
is displayed.
Table 1 describes the parameters in the returned check result.
Table 1 Parameters in the returned check result Item
Description
Pair A/B/C/D
Four pairs of circuits in a network cable.
Pair A length
Length of a network cable:- The length is the distance between the interface and the fault point if a fault occurs.
- The length is the actual length of the cable when the cable works properly.
- The default length is 0 m if the interface is not connected to any network cable.
Pair A state
Network cable status: - Ok: The circuit pair is terminated properly.
- Open: The circuit pair is not terminated.
- Short: The circuit pair is short-circuited.
- Crosstalk: The cable sequence is incorrect.
- Unknown: An unknown fault occurs on the circuit pair.