16. Ethernet Ports
ROX™ v2.2 User Guide
162
RuggedBackbone™ RX5000
1.
Configure the PUT’s cable diagnostics state to “Stopped”. Diagnostics may be stopped at any point.
If a stop is issued in the middle of a diagnostics run, it will nevertheless run to completion and the
results will be updated.
Both the port under test (PUT) or partner port (PT) can be configured to be either in Enabled
mode with auto-negotiation or in Disabled mode. Other modes may interfere with the cable
diagnostics procedure and are not recommended.
16.2.4.2. Interpreting Cable Diagnostics Results
Four different conditions are reported for the state of a cable under examination:
• Good – No fault is detected on the tested cable.
• Open – Opened cable pair(s) is/are detected on the tested cable.
• Short – Short cable pair(s) is/are detected on the tested cable.
• Imped – Impedance Mismatch is detected on the tested cable.
The corresponding counts for each of these status conditions indicates the number of occurrences of
each type of fault. For a typical “no fault” Category 5 cable plugged into a 100BASE-T port, ‘Good’ will be
incremented by two after every run of cable diagnostics, once for each cable pair used by a 100BASE-T
port. Note that for a 1000BASE-T port, four cable pairs will be tested and so ‘Good’ will be incremented
by four after every successful run.
For a fault condition, an estimated distance to the fault will be calculated and recorded in the system
log. For detailed information about which cable pair has been detected to have experienced which type
of fault and the corresponding distance to the fault, please refer to the system log file.
The “Runs” parameter cannot be changed while cable diagnostics are running on a port.
In order to change the value, stop the diagnostic run on the port, change the “Runs”
parameter, and restart diagnostics.
On ports that do not support cable diagnostics, “N/A” will be shown as the cable diagnostics
state and any settings made to the “Runs” and “Calibration” fields will be discarded.
16.2.4.2.1. Cable Diagnostics Testing
To test cable diagnostics, navigate to interfaces/switch/{line module}/diagnostics/start-cable-test and
follow the procedure outlined below.
