Viewing The Results Of The Cable Analysis - Brocade Communications Systems ICX 6610 Installation Manual

Troubleshooting network connections
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
Port Speed Local pair Pair Length Remote pair Pair status
--------- ----- ---------- ----------- ----------- -----------
-- ----- -------
01 UNKWN
76
----- ------
Pair A <=3 M
Pair B <=3 M
Pair C <=3 M
Pair D <=3 M
----------
Open
Open
Open
Open
Brocade ICX 6610 Stackable Switch Hardware Installation Guide
53-1003620-03