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
Service Manual 4 Maintenance and Troubleshooting
Issue 04 (2011-01-12) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
4-5
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