Huawei HG8245T Router Manual PDF (Setup & Configuration Guide)

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–

If the OLT works in the distributed mode, the profiles that are bound to the ONU cannot

be modified or deleted. In this case, bind matching ONU profiles to the ONU.

–

If the OLT works in the profile mode:

1.

Run the

display ont-srvprofile

command to query the information about the ONU

service profile and run the

display ont-lineprofile

command to query the

information about the ONU line profile.

2.

Modify the ONU profiles by referring to

Configuring a GPON ONT Profile

in the

Commissioning and Configuration Guide

.

l

If this problem occurs on only one ONU, it is suggested to bind matching ONU profiles to

the ONU.

–

If the OLT works in the distributed mode:

1.

Run the

display ont-profile

command to query the current ONU profiles that are

configured on the OLT.

2.

If the OLT does not have matching ONU profiles, run the

ont-profile add

command

to add matching ONU profiles.

3.

Run the

ont modify

command to bind the ONU profiles to the ONU.

–

If the OLT works in the profile mode:

1.

Run the

display ont-srvprofile

command to query the information about the ONU

service profile and run the

display ont-lineprofile

command to query the

information about the ONU line profile.

2.

If the OLT does not have matching ONU profiles, add matching ONU profiles by

referring to

Configuring a GPON ONT Profile

in the

Commissioning and

Configuration Guide

.

3.

In the GPON mode of the OLT, run the

ont modify

command to bind the ONU

profiles to the ONU.

Step 2

Check whether

Match state

of the ONU is displayed as

match

.

l

If

Match state

of the ONU is displayed as

match

, go to

Step 4

.

l

If

Match state

of the ONU is displayed as

mismatch

, proceed to

Step 3

.

Step 3

Record the results of the preceding steps in the form for reporting a fault, fill in the form

completely, and then submit the form to Huawei for technical support.

Step 4

The fault is rectified.

----End

Failure to Auto Discover an ONU

The ONU auto discovery failure is a fault in which an OLT fails to auto discover an ONU after

the ONU is powered on.

Location Method

NOTE

The ONU auto discovery is a feature in which a pre-configured ONU automatically registers with an OLT

after the ONU is powered on; if the OLT does not pre-configure the ONU, the ONU enters the auto

discovery state and waits to be configured by the OLT.

When an OLT fails to auto discover an ONU, locate the fault based on the following fault

symptoms and possible causes.

EchoLife HG8010/HG8240B/HG8245T/HG8247T GPON

Terminal

Service Manual

5 Maintenance and Troubleshooting

Issue 01 (2011-10-18)

Huawei Proprietary and Confidential

363

Page 372 / 429

Fault

Scope

Symptom

Possible Cause

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.

l

The ONU auto discovery function is disabled

on the PON port.

l

The laser on the PON port is disabled.

l

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

A single ONU or some

ONUs connected to an

OLT fail to be auto

discovered by the OLT.

l

The branch fiber is bent excessively.

l

The branch fiber connector is not clean.

l

Different types of branch fiber connectors are

interconnected.

l

The multi-mode optical fiber is used as the

branch fiber.

l

The ODN is not properly planned. For

example, the split ratio, network coverage and

attenuation difference are not planned within

the proper ranges.

l

The optical attenuation of the optical path is

excessively small.

l

A branch fiber break occurs.

l

The optical splitter is faulty or the connectors

on the optical splitter are not clean.

All the ONUs connected

to a PON port on an OLT

fail to be auto discovered

by the OLT.

l

The backbone fiber is bent excessively.

l

The backbone fiber connector is not clean.

l

Different types of backbone fiber connectors

are interconnected.

l

The multi-mode optical fiber is used as the

backbone fiber.

l

A backbone fiber break occurs.

l

The optical splitter is faulty or the connectors

on the optical splitter are not clean.

EchoLife HG8010/HG8240B/HG8245T/HG8247T GPON

Terminal

Service Manual

5 Maintenance and Troubleshooting

Issue 01 (2011-10-18)

Huawei Proprietary and Confidential

364

Page 373 / 429

Fault

Scope

Symptom

Possible Cause

ONU

A single ONU or some

ONUs connected to an

OLT fail to be auto

discovered by the OLT.

l

The ONU is not powered on.

l

A rogue ONU (such as a continuous-mode

ONU) exists on the network and affects other

ONUs.

l

The ONU hardware is faulty.

l

The optical module of the ONU is faulty.

l

The Patch cord of the ONU is broken or bent

excessively.

CAUTION

To facilitate fault report, save the results of the following steps.

The parameters of the optical module in this topic comply with Class B+. Note that such

parameters are slightly different from the parameters in Class C.

Procedure

Step 1

Check for the possible causes on the OLT and troubleshoot the faults accordingly. If the ONU

still fails to be auto discovered by the OLT after that, proceed to

Step 2

.

Possible Cause

Judgment Criterion

Troubleshooting Method

The ONU auto discovery

function is disabled on

the PON port.

Run the

display port info

command to query the

information about the PON

port. It is found that

Autofind

is in the

Disable

state.

Run the

port ont-auto-find

command to enable the auto

discovery function of the PON

port.

NOTE

By default, the ONU auto

discovery function is disabled on

a PON port.

EchoLife HG8010/HG8240B/HG8245T/HG8247T GPON

Terminal

Service Manual

5 Maintenance and Troubleshooting

Issue 01 (2011-10-18)

Huawei Proprietary and Confidential

365

Page 374 / 429

Possible Cause

Judgment Criterion

Troubleshooting Method

The actual distance

between the ONU and

OLT exceeds the ranging

compensation distance

configured on the OLT.

Run the

display port info

command to query the

minimum logical reach (

Min

distance

) and maximum

logical reach (

Max distance

)

configured for the PON port. It

is found that the actual distance

between the ONU and OLT

exceeds the ranging

compensation distance.

For example, the actual length

of the optical fiber between the

ONU and OLT is about 25 km,

which exceeds the ranging

compensation distance of 0-20

km.

Run the

port range

command

to adjust the minimum logical

reach and maximum logical

reach so that the actual distance

between the ONU and OLT is

within the ranging

compensation distance.

NOTE

l

By default, the ranging

compensation distance of a

GPON port is from 0 km to 20

km.

l

According to Class B+, the

maximum logical reach of a

GPON port must not exceed

60 km, and the difference

between the minimum logical

reach and maximum logical

reach must not exceed 20 km.

The laser on the PON

port is disabled.

Run the

display port info

command to query the

information about the PON

port. It is found that

Laser

switch

is in the

Off

state.

Run the

port laser-switch

command to enable the laser on

the PON port.

NOTE

By default, the laser on a GPON

port is enabled.

The PON port is faulty.

If either of the following two

situations occurs, the PON port

is faulty.

l

Run the

display port state

command to query the

status of the PON port. It is

found that abnormal items

exist in the query result. For

example, the laser status

(

Laser state

) is abnormal

and the transmit optical

power (

TX power

) exceeds

the normal range (1.5-5.0

dBm).

l

Migrate the service to

another port. It is found that

the ONU is auto discovered

by the OLT.

Replace the optical module of

the PON port or replace the

board.

The board or the slot is

faulty.

All the ONUs connected to the

board fail to be auto discovered

by the OLT.

Change the board to another

slot. If the fault persist, replace

the board.

EchoLife HG8010/HG8240B/HG8245T/HG8247T GPON

Terminal

Service Manual

5 Maintenance and Troubleshooting

Issue 01 (2011-10-18)

Huawei Proprietary and Confidential

366

Page 375 / 429

Step 2

Check for the possible causes on the ODN and troubleshoot the faults accordingly. If the ONU

still fails to be auto discovered by the OLT after that, proceed to

Step 3

.

Possible Cause

Judgment Criterion

Troubleshooting Method

The optical fiber

connector is not clean.

NOTE

An unclean optical fiber

connector will cause

excessive attenuation and

abnormal reflection.

1.

Test the backbone fiber and

branch fiber by using the

OTDR. It is found that the

reflection and return loss

are abnormal.

2.

Check the optical fiber

connector on site by using

the optical fiber endface

detector. It is found that the

optical fiber connector is

not clean.

Clean the optical fiber

connector. For details about

how to clean the connector, see

Cleaning the Connector of an

Optical Fiber.

The optical fiber is bent

excessively.

NOTE

Optical signals attenuate

seriously on an optical

fiber with an excessively

small bending radius.

1.

Test the backbone fiber and

branch fiber by using the

OTDR. It is found that

abnormal return loss points

exist on the optical fiber.

2.

Check the optical fiber on

site. It is found that the

optical fiber is bent

excessively.

Route and bundle the optical

fiber in a proper manner.

The optical fiber is not

firmly connected or

different types of optical

fiber connectors are

interconnected.

NOTE

If the optical fiber is not

firmly connected or

different types of optical

fiber connectors are

interconnected, the

attenuation and reflection

will be excessively large.

1.

Test the backbone fiber and

branch fiber by using the

OTDR. It is found that

abnormal return loss points

exist on the optical fiber.

2.

Check the optical fiber

connectors on site. It is

found that the optical fiber

is not firmly connected or

PC connector (blue) and

APC connector (green) are

interconnected.

l

If the optical fiber is not

firmly connected, reconnect

the optical fiber firmly.

l

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.

NOTE

In the scenario of the CATV

service, it is recommended that

you use APC connectors (green)

only.

EchoLife HG8010/HG8240B/HG8245T/HG8247T GPON

Terminal

Service Manual

5 Maintenance and Troubleshooting

Issue 01 (2011-10-18)

Huawei Proprietary and Confidential

367

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