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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.
EchoLife HG8240/HG8245/HG8247 GPON Terminal
Service Manual
6 Troubleshooting
Issue 02 (2011-01-26)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
6-1
Page 218 / 232
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.
6 Troubleshooting
EchoLife HG8240/HG8245/HG8247 GPON Terminal
Service Manual
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Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
Issue 02 (2011-01-26)
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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.
EchoLife HG8240/HG8245/HG8247 GPON Terminal
Service Manual
6 Troubleshooting
Issue 02 (2011-01-26)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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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
EchoLife HG8240/HG8245/HG8247 GPON Terminal
Service Manual
6-4
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
Issue 02 (2011-01-26)

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