Zte ZXHN H268A User Manual page 11

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What are reasons for DSL synchronization failure (also referred as link
down or link establishment failure)?
If the DSL suddenly fails to be synchronized (link down) during application,
usually the Link indicator on the ZXHN H268A will not be On. It is suggested
to check the following steps one by one:
i. First check the quality of incoming cables and incoming cable connectors.
ii. Install the ZXHN H268A correctly based on the user guidance. Minimize
the number of taps.
iii. Check whether the telephone cables and DSL are in good connection or
whether the telephone cables are normal.
iv. Try to disconnect the splitter and directly connect the ZXHN H268A to the
incoming user cable end. Ensure the problem is not due to improper instal-
lation or incoming user line quality. If the DSL can be synchronized again,
it means that installation of the incoming user side is improper. Please re-
install it according to the user guide.
v. If the DSL still fails to be synchronized when the ZXHN H268A is connected
to the incoming user cable end, contact the operators to check whether it
is due to external line failure or ZXHN H268A failure.
vi. If the splitter problem is determined, call the operator for maintenance or
replacement.
vii. If the problem is due to the end office equipment failure, call the operator
to confirm it.
viii. Too long connection cable between the splitter and ZXHN H268A may
cause poor anti-interference performance and synchronization difficulty.
Therefore, the connection cable should not be too long.