Troubleshoot FTTH IPTV Service Failure 22 Oct, 2025. Posted by:XPONSHOP

This blog describes how to troubleshoot an IPTV service fault in a FTTH network.

Prerequisites
The ONT and the OLT must communicate with each other normally.
NOTE: If a fault occurs in communication between the ONT and the OLT, all the services of the ONT may be interrupted. In this case, troubleshoot the fault first.
Context

The follow figure show an IPTV service in a FTTH network.

Troubleshoot FTTH IPTV Service Failure
Online Access Failures Symptoms

Description

A multicast user fails to go online, and this user is in offline or block state. In this case, when this user orders a video, a blank screen appears.

To query the status of a multicast user, run the display igmp user command.
  • This user is offline.
    huawei#display igmp user service-port 500
  User : 0/1/0/500 
  State : offline 
  Authentication : auth 
  Quick leave : MAC-based 
  ......

  • This user is block.

    huawei#display igmp user service-port 400
  User : 0/1/1/400 
  State : block 
  Authentication : auth 
  Quick leave : MAC-based 
  ......
Fault Identification and Demarcation

Overview

The process of ordering a video is as follows:

  1. The multicast user goes online and ordering a video.

  2. The user STB sends an IGMP REPORT packet to the multicast server.

  3. Based on the received IGMP REPORT packet, the multicast server provisions a video flow.

  4. The network device forward the video flow to the user STB.

Fault Demarcation

If the multicast user is in block state, run the undo igmp user block command to unblock this user.

If the multicast user is in offline state, identify offline causes. In this case, Enable multicast debugging on the OLT and locate the fault based on the displayed multicast debugging information.
NOTE: In config mode, enable multicast debugging on the OLT.
terminal monitor    //Enable debugging display on the user terminal.terminal debugging  //Enable debugging data output on the user terminal.debugging igmp service-port index  //Enable fault diagnosis for multicast users. In this command, parameter "index" is the index of the multicast user.
After locating the fault, disable multicast debugging on the OLT.
undo debugging igmp service-port indexundo terminal debuggingundo terminal monitor

The cause of user offline may differ from the scenario, and errors may have occurred during deployment or maintenance. Locate the fault based on application scenarios.

  • If this fault occurs during site deployment, check the device hardware and the initial device software configuration.

  • If this fault occurs during routine maintenance, this fault is unlikely to be caused by the device software. In this case, check the device hardware. If new users have been added or user configurations have been modified during routine maintenance, check user configurations.

Subscriber Line or Terminal Is Faulty

Fault Locating Guide

Locate the fault based on symptoms.

  • If this user could initially go online and then failed, the software configuration is correct. Pay special attention to hardware, including the STB, ONT, and physical line between the ONT and the STB.

  • If this user has never succeeded in going online, check both hardware and OLT data configuration.

Procedure

Possible Cause

Judgment Criterion

Troubleshooting Method

The STB is faulty.

The user can go online after resetting the STB or replacing the STB with a functional one and ordering the program.

Reset the STB or replace the STB with a functional one.

The ONT is faulty.

The user can go online after resetting the ONT or replacing the ONT with a functional one and ordering the program.

Reset the ONT or replace the ONT with a functional one.

The physical line between the STB and ONT is faulty. For example, the network cable is not securely connected, is damaged, or is incorrectly connected.

Check the LAN indicator on the ONT (the HG8245 is used as an example) to determine the status of the physical line between the STB and ONT.

  • If the LAN indicator is off, the line is faulty.

  • If the LAN indicator is steady on or blinks, the line is in the normal state.

Connect the network cable again or replace the network cable with a functional one.

 If any tech questions, please contact our XponShop team by e-mail at sales@xponshop.com
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