No relevant resource is found in the selected language.

This site uses cookies. By continuing to browse the site you are agreeing to our use of cookies. Read our privacy policy>Search


To have a better experience, please upgrade your IE browser.


EchoLife ONT Maintenance and Troubleshooting Guide

Rate and give feedback:
Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
Local Loopback and Remote Loopback on a POTS Port

Local Loopback and Remote Loopback on a POTS Port

The local loopback and remote loopback on a POTS port are used for determining the section of the line where VoIP service failures occur.


  • The user is a user with the operator authority or higher.
  • The OLT and the NMS communicate with each other properly.
  • The NMS is able to discover an online ONT and VoIP service parameters are configured.

Impact on the System

After loopback is set on a POTS port, normal communication is interrupted and an echo is heard by the caller.


  • The loopback can be set only after a call is set up.
  • After on-hook, the communication ends and loopback is cancelled automatically.
  • Direct switching between local loopback and remote loopback cannot be performed. To switch between local loopback and remote loopback, cancel the current loopback first.


  1. Make calls between VoIP users on an ONT.
  2. In the Main Topology, double-click the required OLT in the Physical Root navigation tree; or right-click the required OLT and choose NE Explorer from the shortcut menu.
  3. Choose GPON > GPON Management from the navigation tree.
  4. On the GPON ONU tab page, set the filter criteria or click to display the GPON ONUs.
  5. Select a required record from the ONT list, and then click the POTS User tab in the lower pane.
  6. Select a record from the ONT list, right-click, and choose RTP Loopback from the shortcut menu, as shown in the following figure.

    Figure 1-12 Local loopback and remote loopback on a POTS port

  7. In the dialog box that is displayed, select a loopback type and click OK to start a test. The loopback types include No Loopback, Local Loopback, and Remote Loopback.


  • After local loopback is set, the local voice is audible. If the local voice is not audible, the POTS port of the ONT is faulty.
  • After remote loopback is set, the peer end can hear his/her echo. If the echo is not audible, the link from the peer end to the local ONT is faulty.

The communication recovers after loopback is cancelled or the phone is placed on the hook.

Updated: 2019-07-10

Document ID: EDOC1100009118

Views: 30123

Downloads: 5463

Average rating:
This Document Applies to these Products
Related Version
Related Documents
Previous Next