Virtual Cable Testing configuration notes
• VCT is supported on copper ports only. It is not supported on fiber ports.
• VCT is only supported when Ethernet port speed is configured to Auto. VCT does not work on ports
with fixed speeds.
• VCT is not supported on the following:
‐ ICX 6610-24F
‐ SX-FI24GPP
‐ SX-FI48GPP
‐ SX-FI2XG
‐ SX-FI8XG
‐ SX-FI24HF
• The port to which the cable is connected must be enabled when you issue the command to
diagnose the cable. If the port is disabled, the command is rejected.
• If the port is operating at 100 Mbps half-duplex, the TDR test on one pair will fail.
• If the remote pair is set to forced 100 Mbps, any change in MDI/MDIX may cause the device to
interpret the Multilevel Threshold-3 (MLT-3) as a reflected pulse, in which case, the device will
report a faulty condition. In this scenario, it is recommended that you run the TDR test a few times,
clearing the registers before each test, for accurate results.
Virtual Cable Test command syntax
To diagnose a cable using TDR, enter commands such as the following at the Privileged EXEC level
of the CLI.
device# phy cable-diagnostics tdr 1/1/1
The clear-diag tdr command clears results of any previous TDR test from test registers for port 1/1/1
(port 1 on slot 1 on device 1).
NOTE
It is recommended that you clear the TDR test registers before each test.
device# clear cable-diagnostics tdr 1/1/1
The command in the previous example diagnoses the cable attached to port 1/1/1.
When you issue the phy cable-diagnostics command, the command brings the port down for a
second or two, and then immediately brings the port back up.
Syntax: clear cable-diagnostics tdr stackid/slot/port
Syntax: phy cable-diagnostics tdr stackid/slot/port
Viewing the results of the cable analysis
To display the results of the cable analysis, enter a command such as the one shown in the following
examples at the Privileged EXEC level of the CLI.
In the first example, the command displays TDR test results for port 1, slot 1 on device 1 in the stack.
The results indicate that the port is down or the cable is not connected.
device>show cable-diagnostics tdr 1/1/1
Virtual Cable Testing configuration notes
218 FastIron Ethernet Switch Administration Guide
53-1003625-01
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