Step 11 End.
----End
5.1.5 Troubleshooting Frequent Interruptions in Internet Service
This section describes how to troubleshoot frequent interruptions in Internet service when local
area network (LAN) users on fiber to the building (FTTB) and fiber to the curb (FTTC) networks
are accessing the Internet.
Fault Location
Use the following guidelines to locate the fault.
Fault Location Location Analysis Possible Causes
User terminal The fault does not recur when the
user's PC is replaced.
The user's PC is infected with
viruses or the network interface card
(NIC) in the user's PC is faulty.
The fault does not recur when the
user terminal is replaced.
The user terminal is faulty.
Link between
user terminal and
optical network
unit (ONU)
Packet loss on the subscriber line
is severe.
l The quality of the subscriber line
is deteriorated.
l The subscriber line is old.
l The subscriber line connectors
are loose.
l There is a strong source of
interference around the user.
ONU
The Internet service on a single
port is frequently interrupted.
l The user port is faulty.
l The quality of the subscriber line
is deteriorated and the packet
loss on the subscriber line is
severe.
Internet services on all ONU ports
are frequently interrupted.
l The ONU is faulty.
l There is a strong source of
interference around the ONU.
l The MAC address has drifted
between ONU ports.
Upper layer
broadband
remote access
server (BRAS)
Internet services of all users
connected to the BRAS are
frequently interrupted.
The BRAS MAC address has drifted
between ONU ports
CAUTION
To facilitate fault report, save the results of the following steps.
SmartAX MA5612 Multi-service Access Module
Maintenance Guide
5 Troubleshooting Services Transmitted Through a GPON
Port
Issue 01 (2012-07-25) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
133
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