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ZXHN H168NW User Manual
Problem and Troubleshooting
NO.
What are the reasons for VDSL2 synchronization
5
failure (also referred to link down or link
establishment failure)?
When the VDSL2 suddenly fails to be synchronized
(link down) during application, it might be caused by
the DSL indicator of the Modem, which is not
constantly On. Perform the following steps to check:
1. Check the quality of the incoming cables and the
incoming cable connectors.
2. Install the VDSL2 Modem correctly by following the
user guide.
3. Ensure the telephone cables are normal and are
properly connected with VDSL2.
4. Disconnect the splitter and directly connect the
VDSL2 Modem to the incoming customer cable end
to ensure that the problem is not caused by improper
installation or poor quality of the incoming customer
cable. If the VDSL2 is synchronized again after that,
it means that the incoming customer part is not
installed properly. Re-install it according to the User
Guide.
16
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