Huawei HG8245A Router Manual PDF (Setup & Configuration Guide)

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6

Troubleshooting

About This Chapter

This topic describes the preliminary troubleshooting flow and methods, preparations before

troubleshooting, and methods of locating faults according to the status of LEDs.

6.1 General Troubleshooting Flowchart and Methods

This topic describes the general troubleshooting flowchart and the methods of preliminarily

locating faults.

6.2 Tools Used for Troubleshooting

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

meter.

6.3 Fault Locating According to the LED Status

This topic describes how to locate a fault according to the status of the LEDs on the ONT.

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6.1 General Troubleshooting Flowchart and Methods

This topic describes the general troubleshooting flowchart and the methods of preliminarily

locating faults.

Context

Figure 6-1

shows the general troubleshooting flowchart.

Figure 6-1

General troubleshooting flowchart

Procedure

Step 1

Locate a fault preliminarily.

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

Table 6-1

lists the possible causes

during preliminary fault locating.

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Table 6-1

Possible causes during preliminary fault locating

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 port.

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 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. For details, see

6.3 Fault Locating According to

the LED Status

.

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.

6 Troubleshooting

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Service Manual

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