OLT

A single ONU or some ONUs connected to an OLT fail to go online.

• The SN or password configured on the OLT is different from the actual SN or password of the ONU; hence, the ONU fails to pass authentication and go online.

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

• The OLT deactivates the ONU.

All the ONUs connected to a PON port of an OLT fail to go online.

• The laser on the PON port is disabled.

• The pluggable optical module of the PON is faulty.

• The PON port is faulty.

All the ONUs connected to a board of an OLT fail to go online.

• The board or the slot is faulty.

ODN

The PON port reports alarms described in ODN-Related Alarms, including:

• 0x2e11a001 The feeder fiber is broken or OLT can not receive any expected optical signals(LOS)

• 0x2e112007 The distribute fiber is broken or the OLT cannot receive expected optical signals from the ONT(LOSi/LOBi)

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

• If a single ONU or multiple ONUs fail to go online, the branch fiber and the optical component may have faults.

• If all ONUs fail to go online, the backbone fiber and the optical component may have faults.

ONU

A single ONU or some ONUs connected to an OLT fail to go online.

• The ONU is not powered on.

• The information (including SN and password) for ONU authentication conflicts; hence, the later power-on ONU fails to go online.

• 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.

• The ONU is incorrectly connected to another PON port.