Huawei HG8245T Router Manual PDF (Setup & Configuration Guide)

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Step 6

The fault is rectified.

----End

?.2. Failure to Recover ONU Configurations

An ONU connected to a GPON port of an OLT can go online successfully, but the queried

Config state

of the ONU is displayed as

failed

by running the

display ont info

command on

the OLT.

Location Method

NOTE

Configuration recovery refers to a process in which, after an ONU goes online, the OLT issues

configurations to the ONU and then the ONU adjusts its operating parameters based on the issued

configurations.

Fault

Scope

Judgment Criterion

Possible Cause

OLT

ONUs of the same type fail

to recover their

configurations.

l

The configurations issued by the OLT

mismatch the actual ONU capabilities.

ODN

NOTE

ODN

failures

are

generally

caused by

large

reflection

and

attenuatio

n caused

by

improper

optical

compone

nts,

design, or

constructi

on.

A single ONU fails to

recover its configurations.

The optical attenuation is over large or small and

the ONU can normally go online but fails to

recover its configurations. The possible causes are

as follows:

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 splitter is faulty or the connectors

on the optical splitter are not clean.

Multiple ONUs connected

to the same PON port of an

OLT fail to recover their

configurations.

The optical attenuation is over large or small and

the ONU can normally go online but fails to

recover its configurations. The possible causes are

as follows:

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.

EchoLife HG8010/HG8240B/HG8245T/HG8247T GPON

Terminal

Service Manual

5 Maintenance and Troubleshooting

Issue 01 (2011-10-18)

Huawei Proprietary and Confidential

358

Page 367 / 429

Fault

Scope

Judgment Criterion

Possible Cause

ONU

A single ONU fails to

recover its configurations.

l

The ONU functions improperly or is faulty.

l

The ONU has been configured at local and the

configurations conflict with configurations

issued by the OLT.

CAUTION

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

Procedure

Step 1

When

Config state

of the ONU is displayed as

failed

, check whether the OLT generates the

following alarm. If such an alarm is generated, clear it and check whether the fault is rectified.

If the fault persists, proceed to

Step 2

.

l

0x2e21a102 The GPON ONT configuration recovery fails

Step 2

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

fails to recover its configurations, go to

Step 3

.

Possible Cause

Judgment Criterion

Troubleshooting Method

The configurations

issued by the OLT

mismatch the actual

ONU capabilities.

Check configurations issued to

the ONU by the OLT. It is

found that some configurations

are not supported by the ONU.

For example, the number of

GEM ports exceeds the number

supported by the ONU.

Modify OLT configurations

based on actual ONU

capabilities.

Step 3

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

still fails to recover its configurations after that, go to

Step 4

.

EchoLife HG8010/HG8240B/HG8245T/HG8247T GPON

Terminal

Service Manual

5 Maintenance and Troubleshooting

Issue 01 (2011-10-18)

Huawei Proprietary and Confidential

359

Page 368 / 429

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.

The return loss points of the

backbone fiber and branch

fiber are abnormal tested by

using the OTDR.

2.

The optical fiber is bent

excessively onsite.

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.

The return loss points of the

backbone fiber and branch

fiber are abnormal tested by

using the OTDR.

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.

The multi-mode optical

fiber is used.

NOTE

If the multi-mode optical

fiber is used as the

backbone or branch optical

fiber, the optical signal

attenuates quickly and the

return loss increases.

1.

Optical signals of the

backbone fiber and branch

fiber attenuate seriously by

using the OTDR.

2.

The multi-mode optical

fiber is used onsite. The

multi-mode optical fiber

can be recognized by its

physical features such as its

color.

Replace the multi-mode optical

fiber with the single-mode

optical fiber.

EchoLife HG8010/HG8240B/HG8245T/HG8247T GPON

Terminal

Service Manual

5 Maintenance and Troubleshooting

Issue 01 (2011-10-18)

Huawei Proprietary and Confidential

360

Page 369 / 429

Possible Cause

Judgment Criterion

Troubleshooting Method

The ODN is not properly

planned.

NOTE

l

The split ratio of the

ODN link is not

determined by the

number of ONUs

connected but by the

split ratio of optical

splitters. When an

optical splitter is

connected to the ODN,

attenuation occurs and

the split ratio of the

optical splitter needs to

be calculated.

l

Protocols specify that

the receive optical

power of the OLT

should not exceed 15

dB. In addition, the

difference between the

maximum optical

power and the

minimum optical

power should not

exceed 15 dB.

The ODN does not meet the

requirements of the ODN link

plan or GPON.

l

Three-level splitting exists

in the ODN.

l

The network coverage of

the ODN exceeds 20 km by

far.

l

The split ratio exceeds the

specification. For example,

a board supports a

maximum of 1:64 split

ratio. If the first-level split

ratio is 1:8, the second-level

is 1:16, the actual split ratio

is 1:128. This exceeds the

specification (1:64).

l

The optical attenuation

difference of two optical

lines exceeds 15 dB.

Optimize the ODN to meet

Huawei's ODN planning

requirements and protocol

requirements.

The optical splitter is

faulty or the connectors

on the optical splitter are

not clean.

Measure the input and output

optical power of the optical

splitter by using the optical

power meter. It is found that the

actual attenuation exceeds the

theoretical attenuation.

NOTE

The faults in the optical splitter

cannot be located by the OTDR

because the OTDR cannot

penetrate the optical splitter.

Replace the faulty optical

splitter or clean the connectors

on the optical splitter.

Step 4

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

still fails to recover its configurations after that, go to

Step 5

.

Possible Cause

Judgment Criterion

Troubleshooting Method

The ONU has been

configured at local and

the configurations

conflict with

configurations issued by

the OLT.

The management-related ONU

configurations such as IP

address and management mode

are configured on the web page.

Delete the web page

configurations and issue

configurations to the ONU by

the OLT.

EchoLife HG8010/HG8240B/HG8245T/HG8247T GPON

Terminal

Service Manual

5 Maintenance and Troubleshooting

Issue 01 (2011-10-18)

Huawei Proprietary and Confidential

361

Page 370 / 429

Possible Cause

Judgment Criterion

Troubleshooting Method

The ONU functions

improperly or is faulty.

Run the

ont reset

command to

reset the ONU. It is found that

the ONU fails to recover its

configurations.

Replace the faulty ONU with a

functional one.

Step 5

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 6

The fault is rectified.

----End

?.3. ONU Profile Mismatch

An ONU connected to a GPON port of an OLT can go online successfully, but the queried

Match state

of the ONU is displayed as

mismatch

by running the

display ont info

command

on the OLT.

Location Method

NOTE

Match state

indicates the consistency between the actual ONU capabilities and the capability set (including

the port type and port quantity) configured in the ONU profiles. If an inconsistency exists,

Match state

is

displayed as

mismatch

.

In practice, ONUs in the offline state are bulk pre-configured on the OLT to facilitate service provisioning.

An ONU service profile and an ONU line profile are specified during such configurations. The ONU

profiles together can be regarded as a virtual ONU. Subsequent services are configured based on this virtual

ONU. Inconsistency between the capability set configured in the ONU profiles and the actual ONU

capabilities involves the following two situations:

l

The configured capability set outmatches the actual ONU capabilities. If the ONU is bound to such

ONU profiles, ONU configurations will fail to be recovered when the ONU goes online.

l

The configured capability set undermatches the actual ONU capabilities. In this case, the ONU

capabilities that are not covered by the ONU profiles will fail to be configured or applied.

When the queried

Match state

of the ONU is displayed as

mismatch

, locate the fault according

to the following procedure:

1.

Check whether the capability set configured in the ONU service profile and line profile

matches the actual ONU capabilities.

CAUTION

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

Procedure

Step 1

Run the

display ont capability

command to query the actual ONU capabilities. According to

the data plan, modify the current ONU profiles, or bind matching ONU profiles to the ONU.

l

If this problem occurs on all the ONUs of the same type, the configurations of the ONU

profiles may be incorrect.

EchoLife HG8010/HG8240B/HG8245T/HG8247T GPON

Terminal

Service Manual

5 Maintenance and Troubleshooting

Issue 01 (2011-10-18)

Huawei Proprietary and Confidential

362

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