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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 H389A 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 H389A 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 H389A to
the incoming user cable end. Ensure the problem is not due to improper
installation or incoming user line quality. If the DSL can be synchronized
again, it means that installation of the incoming user side is improper.
Please reinstall it according to the user guide.
v. If the DSL still fails to be synchronized when the ZXHN H389A is con-
nected to the incoming user cable end, contact the operators to check
whether it is due to external line failure or ZXHN H389A 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 H389A may
cause poor anti-interference performance and synchronization difficulty.
Therefore, the connection cable should not be too long.
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The green LAN indicator on the front panel is off after the device is
powered on.
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The corresponding LAN link is not established.
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The Ethernet cable is not correctly connected to the LAN interface.
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The network device connected to the LAN interface is not powered on.
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FCC Statement
This equipment has been tested and found to comply with the limits for a Class
B digital device, pursuant to part 15 of the FCC Rules. These limits are de-
signed to provide reasonable protection against harmful interference in a res-
idential installation. This equipment generates, uses and can radiate radio
