Fault Identification and Demarcation

OLT

A single ONU or some ONUs connected to an OLT fail to be auto discovered by the OLT.

The actual distance between the ONU and OLT exceeds the ranging compensation distance configured on the OLT.

All the ONUs connected to a PON port on an OLT fail to be auto discovered by the OLT.

• The ONU auto discovery function is disabled on the PON port.
• The laser on the PON port is disabled.
• The PON port is faulty.

All the ONUs connected to a board on an OLT fail to be auto discovered by the OLT.

The board or the slot is faulty.

ODN

The PON port reports alarms described in ODN-Related Alarms, including 0x2e11a001 The feed fiber is broken or OLT can not receive any expected optical signals(LOS) and etc.

ODN failures are generally caused by large reflection and attenuation caused by improper optical components, design, or construction. For details, see Common ODN Faults.

• If a single ONU or multiple ONUs connected to an OLT fail to be auto discovered by the OLT, the branch fiber and the optical component may have faults.
• If all ONUs connected to a PON port on an OLT fail to be auto discovered by the OLT, the backbone fiber and the optical component may have faults.

ONU

A single ONU or some ONUs connected to an OLT fail to be auto discovered by the OLT.

• The ONU is not powered on.
• A rogue ONU exists on the network and affects other ONUs.
• The ONU hardware is faulty.
• The optical module of the ONU is faulty.
• The Patch cord of the ONU is broken or bent excessively.