Configuration Guide (Supporting R2.2.0.0) Owner's manual

Brocade 6910 Ethernet Access Switch Configuration Guide 721
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Port Configuration
FIGURE 50 Configuring Transceiver Thresholds
Performing Cable Diagnostics
Use the Interface > Port > Cable Test page to test the cable attached to a port. The cable test will
check for any cable faults (short, open, etc.). If a fault is found, the switch reports the length to the
fault. Otherwise, it reports the cable length. It can be used to determine the quality of the cable,
connectors, and terminations. Problems such as opens, shorts, and cable impedance mismatch
can be diagnosed with this test.
CLI References
• “Interface Commands” on page 255
Command Usage
• Cable diagnostics are performed using Digital Signal Processing (DSP) test methods. DSP
analyses the cable by sending a pulsed signal into the cable, and then examining the reflection
of that pulse.
• Cable diagnostics can only be performed on twisted-pair media.
• This cable test is only accurate for cables 7 - 140 meters long.
• The test takes approximately 5 seconds. The switch displays the results of the test immediately
upon completion, including common cable failures, as well as the status and approximate
length to a fault.
• Potential conditions which may be listed by the diagnostics include:
• OK: Correctly terminated pair
• Open: Open pair, no link partner
• Short: Shorted pair
• Not Supported: This message is displayed for any Gigabit Ethernet ports linked up at a
speed lower than 1000 Mbps.
• Impedance mismatch: Terminating impedance is not in the reference range.
• Ports are linked down while running cable diagnostics.