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C h a p t e r 4
Troubleshooting
• All indicators are Off when the ZXHN H268A equipment is powered
On.
First make sure that you have inserted the power adapter of the ZXHN
H268A into a working power socket and that the ZXHN H268A has been
powered On (the switch button is pressed down). If the indicators are still
Off after confirmation of the above items, may be the hardware is damaged.
You may contact local operator for maintenance. Never dismantle the
equipment by yourself.
• Sometimes, the VDSL2 users cannot access to the Internet normally
First check whether the ZXHN H268A is in the normal state (Check the
indicators according to this user manual). If yes, the computer or application
network may be faulty. This is unrelated with VDSL2. If the ZXHN H268A
is abnormal, check the status of indicators one by one to remove the fault.
It is suggested to check the following items before seeking help from
operator:
i. The VDSL2 telephone cable connectors are proper.
ii. The VDSL2 is away from the power cable and large-power electronic
devices.
iii. No telephone extensions and fax machines are connected between the
VDSL2 incoming line and splitter.
iv. The splitter has been installed correctly.
v. The ZXHN H268A has good heat dissipation ratio.
• What are reasons for VDSL2 synchronization failure (also referred as
link down or link establishment failure)?
If the VDSL2 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 VDSL2 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
installation or incoming user line quality. If the VDSL2 can be
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