2.FTTx GPON ONU Troubleshooting

8/17/2019 2.FTTx GPON ONU Troubleshooting

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FTTx GPON ONU Troubleshooting


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display board 0/slot check all the ONUs that belong toone service card

display ont info portid all check all the ONUs that belong toone PON interface

display ont info portid ontid check the detailed information ofone specified ONU

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The ONT status falls into three types: ONT running status, ONT configuration status and ONT matching

status.

The ONT running status refers to the ONT service condition. It indicates whether the ONT is

online and whether the ONT carries the service.

If the ONT running status is DOWN, the ONT does not support the ONT version

query, ONT FE statistics query or GEM port statistics query. The ONT cannot carry

service either.

If the ONT running status is UP, the ONT is online and the three yellow LEDs on the

ONT are on. In this case, whether the service can be forwarded is decided by the

ONT configuration status.

The ONT configuration status indicates whether the configuration restoration is enabled and

whether the configuration restoration is complete. The ONT configuration status has these

states: initial state (initial), normal state (normal), no configuration restoration (no resume),

configuring (config) and configuration failure (failed).

When the actual ONT capability is the same as the configuration of the capability set profile,

the ONT is in the configuration restoration stage.

The first status is "initial". Soon the "initial" ends and the ONT enters the "config" state.

The "config" stage mainly restores the ONT capability data and configuration data. The

duration of the "config" state is decided by the data volume configured on the ONT.

If the configuration restoration succeeds, the ONT transits from the "config" state

to the "normal" state.

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If the configuration restoration fails, the ONT transits from the "config" state to the

"failed" state and the service cannot be forwarded.



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When the actual ONT capability is different from the configuration of the

capability set profile, the ONT is processed based on the ONT

configuration restoration policy that is configured by the ont resume

resource command.

If the restoration policy is enabled, only the configuration allowedby the ONT actual capability is delivered.

If the restoration policy is disabled, the ONT configuration status

is "no resume" and the service cannot be forwarded.

The ONT matching status indicates whether the ONT actual capability is

the same as the capability set profile bound to the ONT. The status

include: initial, mismatch and match. To some extent, the matching status

is decided by the ONT running status and configuration status.

Only when the ONT running status is up, the configuration status

is normal, and the hardware capability is the same as the ONT

capability set profile bound with the ONT, the matching status is

match.

Otherwise, the status is mismatch. In all other configuration states,

the matching status is initial.

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The ONT matching status does not affect the normal forwarding of the

service flow, and only indicates whether the ONT actual capability is the

same as the capability set profile bound to the ONT.



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Failure to Automatically Find an ONU

The ONU auto-find failure is a fault in which an OLT fails to automatically find an ONU after

the ONU is powered on.

ONU Registration Failure

The ONU registration failure is a fault in which the values of Run state, Config state, andMatch state of an ONU are abnormal as queried by running the display ont info command on

the OLT.

ONU Frequently Goes Online and Offline

ONUs connected to a GPON port frequently goes online and offline and thus the OLT reports

a large number of ONU LOS alarms and relevant recovery alarms.

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1.When the ONU fails to register, check whether the following alarms are generated:

0x2e314021 There are illegal incursionary rogue ONTs under the port

0x2e314022 The ONT is rogue ONT

0x2e11a00b The dying-gasp of ONTi DGi) is generated

0x2e112007 The distribute fiber is broken or OLT can not receive expected optical signals from GPON

ONT LOSi)

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

0x2e21a102 The GPON ONT configuration recovery fails

2.Check whether the ONU is configured.

3.In the GPON mode of the OLT, run the display ont info command to query the ONU status.

If the Control flag of the ONU is deactivated, run the ont activate command to activate the ONU

4.Run the display ont capability command to query the actual capability of the ONU. Bind the

capability set profile matching the ONU capability according to the data plan or modify the ONU

capability set profile

5.Check whether 0x2e305015 The authentication information of the ONTs conflicts is generated on theOLT。

6.Check whether there are a lot of ONUs are connected to a splitter.

7.Run the display port info command to query the maximum registered distance of the ONU

connected to a GPON port.

If the actual distance from the OLT to the ONU is beyond the maximum registered distance

preset on the OLT, run the port range command to adjust the maximum distance. This makes

the actual distance shorter than the maximum registered distance.

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1.Check whether the following alarm is generated in the system.

0x2e11a001 The feed fiber is broken or OLT can not receive any expected optical

signals LOS)

2.Run the display port info command to query the port status.

If the "Laser switch" is "Off", run the undo shutdown command to enable the optical

transceiver. After the optical transceiver is enabled, if the "Laser switch" is still in the

"Off" state, replace the optical transceiver.

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OLT:

1. The ONU auto-find function is disabled on the PON port.

Run the port ont-auto-find command to enable the auto-find function of the PON port.

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

Run the port range command to adjust the minimum logical reach and maximum logical reach sothat the actual distance between the ONU and OLT is within the ranging compensation distance.

3. The laser on the PON port is disabled.

Replace the optical transceiver of the PON port or replace the board.

4. The board is faulty.

Replace the board.

ODN:

1. The optical fiber connector is not clean.

Clean the optical fiber connector.

2. The optical fiber is bent excessively.

Route and bundle the optical fiber in a proper manner.

3. The optical fiber is not firmly connected or different types of optical fiber connectors areinterconnected.

If the optical fiber is not firmly connected, reconnect the optical fiber firmly.

If different types of optical fiber connectors are interconnected, replace the incompatible connectorwith a compatible one or replace

relevant devices, such as the optical splitter.

4. The multi-mode optical fiber is used as the backbone or branch optical fiber.

Replace the multi-mode optical fiber with the single-mode optical fiber.

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5. The optical attenuation of the optical path is excessively small.

Add an optical attenuator on the optical path between the OLT and ONU.

6. The ODN is not properly planned.

Optimize the ODN to meet Huawei's ODN planning requirements and protocol

requirements.

7. The optical splitter is faulty or the connectors on the optical splitter are not clean.

Replace the faulty optical splitter or clean the connectors on the optical splitter.

8. A backbone fiber break occurs.

Reconnect the backbone optical fiber.

9. A branch fiber break occurs.

Reconnect the branch optical fiber.

ONU:

1. The ONU is not powered on. Restore the power supply of the ONU.

2. The ONU hardware is faulty.

Replace the faulty ONU or the optical transceiver of the ONU.

3. The optical transceiver of the ONU is abnormal. For example, the transmit optical power of

the optical transceiver is excessively small or its receiver sensitivity is low.

Replace the faulty ONU or the optical transceiver of the ONU.

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OLT:

1. The PON port is faulty.

Replace the optical transceiver of the PON port or replace the board.

2. The board is faulty.

Replace the board.

ODN:

1. The optical fiber connector is not clean.

Clean the optical fiber connector.

2. The optical fiber is bent excessively.

Route and bundle the optical fiber in a proper manner.

3. The optical fiber is not firmly connected or different types of optical fiber connectors are

interconnected. If the optical fiber is not firmly connected, reconnect the optical fiber firmly.

If different types of optical fiber connectors are interconnected, replace the incompatible

connector with a compatible one or replace relevant devices, such as the optical splitter.

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4. The multi-mode optical fiber is used as the backbone or branch optical fiber.

Replace the multi-mode optical fiber with the single-mode optical fiber.

5. The optical splitter is faulty or the connectors on the optical splitter are not clean.

Replace the faulty optical splitter or clean the connectors on the optical splitter.

6. The ODN is not properly planned.

Optimize the ODN to meet Huawei's ODN planning requirements and protocol

requirements.

ONU:

1. A rogue ONU (such as a continuous-mode ONU) exists on the network and affects other

ONUs.

Replace the rogue ONU with a normal one.

2.The ONU is restarted repeatedly.

Replace the ONU or ensure that the power supply of the ONU is normal.

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A1:“Match status” indicate the matching condition of NOT’s real hardware capabilityand the configuration in service profile that bound to ONT. When the statusis“mismatch”, we can run command “display ont capability”to check the realcapability, and then modify the service profile to make it identical with real capability.

A2. Optical module fault

Feed fiber or the splitter fault

PON interface disable the auto-find function

The permission accessing distance configuration incorrect

Other causes

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33FTTx GPON ONU Troubleshooting

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2.FTTx GPON ONU Troubleshooting