Zyxel OLT2412 [299/326] Troubleshooting

Zyxel OLT2412 [299/326] Troubleshooting
OLT2412 User’s Guide 299
CHAPTER 45
Troubleshooting
This section describes how to troubleshoot problems occurring on this OLT, the ONTs/ONUs, the
ODN, or the other devices involved in the GPON network.
General Checking on the OLT.
Check if all the LEDs on the MSC cards, fan module, uplink cards, and GPON cards are behaving
normally.
Use the show lc stats command to make sure each installed card is active. You may need to
reinstall the card or re-configure the slot if it is not.
Check if ONTs/ONUs are up. Contact your local vendor to make sure the ONT/ONU models are
supported.
Check the receiving and transmitting optical power on both the OLT and ONT/ONU devices. They
should be in the normal range. See The OLT cannot detect an ONU or an ONU cannot connect to the
OLT. on page 300 for the range.
Make sure the fiber cable length between the OLT and each ONT/ONU is not too long (< 20 km).
Check if there is a rogue ONT/ONU. See Section 45.1 on page 301.
Check if the connected ONTs/ONUs status is stable.
Check for any alarms related to an ONT/ONU by using the show logging command.
Check if the settings on the GPON port and the ONTs/ONUs are properly configured. See the Initial
Setup and Provisioning chapters.
The PWR LED does not turn on or is blinking.
The PWR light blinks if the input power for the fans is not stable and is off if there is no input
power. The PWR light stays on if the input for the fans is normal.
Table 172 PWR LED Troubleshooting
STEP CORRECTIVE ACTION
1 Make sure the power wires are properly connected to the power supply and the power supply is
operating normally. Make sure you are using the correct power source (refer to Chapter 46 on page
315). Make sure the power supply modules are turned ON. Refer to Section 2.4 on page 38.
2 The LED itself, the fan module, or the unit may be faulty; contact your vendor.

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