Huawei HG8247H Router Manual PDF (Setup & Configuration Guide)

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Figure 4-1

General troubleshooting flowchart

Procedure

Step 1

Locate a fault preliminarily.

Find the fault location and determine the cause of the fault.

Table 4-2

lists the possible causes

during preliminary fault locating.

EchoLife HG8240/HG8245/HG8247 GPON Terminal

Service Manual

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Table 4-2

Locate a fault preliminarily

Fault Type

Possible Cause

ONT registration failure

l

The PON terminal goes online in an

incorrect mode.

l

The optical fiber connected to the ONT is of

poor quality or is loosely connected.

l

The optical power of the ONT is not within

the normal range.

l

The minimum and maximum logical

distances configured on the OLT port to

which the ONT is connected are inconsistent

with the actual distances.

l

The ONT auto-find function is disabled on

the OLT.

l

When the ONT is added, the configured SN

of the ONT is different from the actual ONT

SN.

l

An ONT with the same SN is already

connected to the OLT.

l

The ONT is a rogue ONT.

Call failure or poor voice quality

l

The connection between the telephone set

and the ONT is abnormal.

l

The ONT port to which the telephone set is

connected is configured incorrectly.

l

The telephone set does not register with the

voice server.

l

The voice service of the telephone set is not

configured with a high priority.

l

The line connections are abnormal.

l

The telephone set is faulty.

l

The numbers configured on the ONT are

incomplete.

l

The digitmap configuration is incorrect.

l

The codec and authentication configured on

the ONT are incorrect.

l

A phone number conflict occurs during the

registration.

l

The voice IP address fails to be obtained.

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Fault Type

Possible Cause

Internet access failure

l

The user terminal or the loop line is faulty.

l

The PON port is faulty.

l

The data configuration of the upper-layer

device is incorrect.

l

The PON board on the OLT is faulty.

l

The optical path is faulty.

l

The board or port on the ONT is faulty.

l

There are network attacks.

l

The WAN port fails to obtain the address.

l

The ping operation with the IP addresses of

the ONT WAN port and the ONT fails.

l

The WAN MAC address of the ONT

defaults to 000000000002.

l

The NAT function is disabled on the bound

WAN port.

l

The LAN port on the ONT is a bridge

Ethernet port, but the PC connected to the

LAN port fails to obtain the IP address

allocated by the upper-layer network.

Step 2

Check the status of the optical fiber.

Check the following items:

l

Whether the optical fiber is properly connected.

l

Whether the optical fiber is bent excessively.

l

Whether the optical fiber connector is clean.

l

Whether the mean launched Tx optical power is normal.

l

Whether the Rx optical sensitivity is normal.

Step 3

Check the ONT status.

Check the status of the LEDs on the ONT.

You can also query the ONT status on the OLT.

In the GPON mode, run the

display ont info

command to check the ONT information.

Specifically, mainly check

Control Flag

,

Run State

,

Config State

, and

Match State

.

l

If

Control Flag

is

active

and

Run State

is

up

, it indicates that the ONT works in the normal

state, that is, the user passes the authentication and goes online.

l

If

Control Flag

is

active

and

Run State

is

down

, it indicates that the user is offline.

l

If

Control Flag

is

deactive

, the ONT registration is disabled. In this case, run the

ONT

activate

command in the GPON mode to activate the control flag.

l

If

Config State

is

normal

, it indicates that the ONT configuration recovery is successful.

EchoLife HG8240/HG8245/HG8247 GPON Terminal

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l

If

Config State

is

failed

, it indicates that the ONT configuration recovery fails. A possible

cause of this failure is that the ONT is bound to an incorrect ONT profile. To resolve this

problem, run relevant commands to issue a correct ONT profile, or reset the ONT.

l

If

Match State

is

match

, it indicates that the configured capacity set of the ONT is the same

as the actual ONT capabilities. If

Match State

is

mismatch

, it indicates that the configured

capacity set of the ONT is different from the actual ONT capabilities, which will cause

registration failure. In this case, add a new ONT service profile.

Step 4

Check the statistics of the ONT.

l

In the GIU mode, run the

display port statistics

command to query the traffic statistics of

the upstream port of the ONT. Specifically, check whether receive and transmit traffic exists.

l

In the GPON mode, run the

display statistics ont

command to query the performance

statistics of the ONT PON port.

l

In the GPON mode, run the

display statistics ont-eth

command to query the performance

statistics of the ONT ETH ports.

Step 5

Check the data configuration of the ONT.

l

Run the

display dba-profile

command to check the DBA profile bound to the ONT.

l

Run the

display service-port

command to check whether the traffic stream configuration is

correct.

l

Run the

display vlan

command to check whether the upstream port of the ONT is added to

a VLAN.

Step 6

Check the status of the upper-layer device. Specifically, check whether the OLT is in the normal

state.

----End

4.3 Tools Used for Troubleshooting

This topic describes the tools required for troubleshooting: digital multimeter and optical power

meter.

4.3.1 Digital Multimeter

This topic describes the functions and usage instructions of the digital multimeter.

4.3.2 Optical Power Meter

This topic describes the appearance, functions, and usage instructions of the optical power meter.

4.3.1 Digital Multimeter

This topic describes the functions and usage instructions of the digital multimeter.

The digital multimeter is a simple and practical test meter frequently used in the electrotechnical

and electronic industries. It is inexpensive, convenient to carry and easy to use, and has a

complete set of functions.

Basically, the digital multimeter is used to measure the resistance, DC voltage, AC voltage,

current and capacitance, and test diodes and triodes.

To use the digital multimeter, do as follows:

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1.

Turn on the power supply. (If a digital multimeter without a dedicated power switch is used,

skip this step.)

2.

Select the items to be tested.

3.

Choose a proper measurement range.

4.

Perform the measurement correctly.

5.

(Optional) Press the button for keeping the current measurement value unchanged.

6.

Read the measurement value.

4.3.2 Optical Power Meter

This topic describes the appearance, functions, and usage instructions of the optical power meter.

The optical power meter is a necessary test meter for testing an optical fiber communication

system. It is mainly used to measure the optical power of various wavelengths at multiple

measurement points of an optical link. Optical power indicates the energy of the light at a

measurement point of an optical link and is an important index of the optical fiber network.

When the optical power is smaller than a specified value, the optical receive end will fail to

detect optical signals. In other words, the optical receive end cannot receive the signals sent from

the transmit end. Hence, it is important to use the optical power meter correctly.

The following considers EXFO's PPM-350B optical power meter as an example to describe how

to use an optical power meter. (Other dedicated optical power meters for PON are used in a

similar way.)

The PPM-350B optical power meter can measure the optical power of various wavelengths,

including 1310 nm, 1490 nm, and 1550 nm in the GPON network.

Figure 4-2

shows the

appearance of the PPM-350B optical power meter.

Figure 4-2

Appearance of the PPM-350B optical power meter

EchoLife HG8240/HG8245/HG8247 GPON Terminal

Service Manual

4 Maintenance and Troubleshooting

Issue 04 (2011-01-12)

Huawei Proprietary and Confidential

4-7

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