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Configuring Virtual Cable Test
Context
Virtual cable test (VCT) technology uses time domain reflectometry (TDR) to detect the cable status. When a pulse is transmitted to the end of a cable or a failure point in the cable, some pulse energies are reflected to the transmitting end. The VCT algorithm measures the time spent on transmitting pulses over a cable, reaching a failure point, and returning the pulses. The measured time is converted to a distance.
VCT can detect the fault type of a network cable and identify failure points, facilitating network cable fault diagnosis.
- V300R019C00 version:
- The combo port about AR1600 series, AR651C, AR6140-9G-2AC, do not support the VCT configuration.
- AR6140-S do not support the VCT configuration.
- The SRU-100H, SRU-200H, SRU-400H, and SRU-600H MPU devices do not support the VCT configuration.
- V300R019C10 and later version:
- The combo port about AR1600 series, AR611W (except GE0/0/4), AR611W-LTE4CN (except GE0/0/4), AR617VW (except GE0/0/4), AR617VW-LTE4CN (except GE0/0/4), AR6120, and AR6120-VW do not support the VCT configuration.
- The SRU-100H and SRU-200H MPU devices do not support the VCT configuration.
- Interfaces on the 4GE-2S cards do not support the VCT configuration.
Procedure
- Run system-view
The system view is displayed.
- Run interface interface-type interface-number
The interface view is displayed.
- Run virtual-cable-test
The VCT function is configured.
- The test result is only for reference and may be inaccurate for cables from some vendors.
- Running the virtual-cable-test command may affect services on the interface in a short period of time.
- Combo electrical interfaces support VCT.
- Before performing a virtual cable test, shut down the remote interface or remove the network cable between the local and remote interfaces. Otherwise, signals from the remote interface may make the test result inaccurate.