| Problem | Cause | Solution |
| The application displays a message indicating that a “Non-resolved fiber end” event has been found. | The fiber under test is too long. | Ensure that the fiber under test is shorter than the maximum length the OTDR can measure. |
| The application displays a message indicating that a “live fiber error” occurred and the fiber was not connected to the SM Live port. | Light has been detected on the OTDR port during the acquisition or while you were monitoring a fiber in real-time mode. | Disconnect the fiber from the OTDR port. Press OK to close the message. Start another acquisition without any fiber connected to the OTDR. The message about live fiber error should not appear and the OTDR trace should look “normal”. If you still see the message about live fiber error even if no fiber is connected to the OTDR, contact EXFO. Never connect a live fiber to the OTDR port without a proper setup. Any incoming optical power ranging from –65 dBm to –40 dBm will affect the OTDR acquisition. The way the acquisition will be affected depends on the selected pulse width. Any incoming signal greater than – 20 dBm could damage your OTDR module permanently. For live-fiber testing, refer to the SM Live port specifications for the characteristics of the built-in filter. |
| The application displays a message indicating that a “live fiber error” occurred and the fiber was connected to the SM Live port. | The level of integrated power in the filter bandwidth of the SM Live port is too high. A transmission wavelength from the network could be too close to the SM Live wavelength. | Disconnect the fiber from the OTDR port. Press OK to close the message. Start another acquisition without any fiber connected to the OTDR. The message about live fiber error should not appear and the OTDR trace should look “normal”. If you still see the message about live fiber error even if no fiber is connected to the OTDR, contact EXFO. Singlemode live-fiber testing requires that the integrated power in the test channel (corresponding to the filter bandwidth of the SM Live port) be as low as possible. Any incoming optical power ranging from –65 dBm to – 40 dBm will affect the OTDR acquisition. The way the acquisition will be affected depends on the selected pulse width. Higher power levels will prevent acquisition from running. Verify network compatibility with the SM Live wavelength. Ensure that the network is not transmitting wavelengths greater than 1600 nm. |
Source from EXFO Users Manual
