ZXDSL 931DII User Manual
13
No. Problem and Troubleshooting
If the VDSL2 suddenly fails to be synchronized (link down) during application,
usually the Link indicator on the MODEM will not be ON. It is suggested to
check the following steps one by one:
1. First check the quality of incoming cables and incoming cable connectors.
2. Install the VDSL2 MODEM correctly based on the user guidance. Minimize
the number of taps.
3. Check whether the telephone cables and VDSL2 are in good connection or
whether the telephone cables are normal.
4. Try to disconnect the splitter and directly connect the VDSL2 MODEM to
the incoming user cable end. Ensure the problem is not due to improper
installation or incoming user line quality. If the VDSL2 can be synchronized
again, it means that installation of the incoming user side is improper. Please
reinstall it according to the user guide.
5. If the VDSL2 still fails to be synchronized when the VDSL2 MODEM is
connected to the incoming user cable end, contact the operators to check whether
it is due to external line failure or MODEM failure.
6. If the splitter problem is determined, call the operator for maintenance or
replacement.
7. If the problem is due to the end office equipment failure, call the operator to
confirm it.
8. Too long connection cable between the splitter and VDSL2 MODEM may
cause poor anti-interference performance and synchronization difficulty.
Therefore, the connection cable should not be too long.
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