User guide

694 Brocade 6910 Ethernet Access Switch Configuration Guide
53-1002581-01
Port Configuration
33
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.
Parameters
These parameters are displayed:
• Port – Switch port identifier.
• Type – Displays media type. (GE – Gigabit Ethernet, Other – SFP)
• Link Status – Shows if the port link is up or down.
• Test Result – The results include common cable failures, as well as the status and approximate
distance to a fault, or the approximate cable length if no fault is found.
To ensure more accurate measurement of the length to a fault, first disable power-saving
mode on the link partner before running cable diagnostics.
For link-down ports, the reported distance to a fault is accurate to within +/- 2 meters. For
link-up ports, the accuracy is +/- 10 meters.
• Last Updated – Shows the last time this port was tested.
Interface
To test the cable attached to a port:
1. Click Interface, Port, Cable Test.
2. Click Test for any port to start the cable test.