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)