Zte ZXHN H1600 Maintenance Management Manual page 109

ZXHN H1600 Maintenance Management Guide
2. The DSL is away from the power cable and large-power electronic devices.
3. No telephone extensions and fax machines are connected between the DSL in-
coming line and splitter.
4. The splitter has been installed correctly.
5. The ZXHN H1600 has good heat dissipation ratio.
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 H1600 will not be On. It is suggested to check the fol-
lowing steps one by one:
1. First check the quality of incoming cables and incoming cable connectors.
2. Install the ZXHN H1600 correctly based on the user guidance. Minimize the num-
ber of taps.
3. Check whether the telephone cables and DSL are in good connection or whether
the telephone cables are normal.
4. Try to disconnect the splitter and directly connect the ZXHN H1600 to the incom-
ing user cable end. Ensure the problem is not due to improper instal- lation or in-
coming user line quality. If the DSL can be synchronized again, it means that in-
stallation of the incoming user side is improper. Please re- install it according to
the user guide.
5. If the DSL still fails to be synchronized when the ZXHN H1600 is connected to the
incoming user cable end, contact the operators to check whether it is due to ex-
ternal line failure or ZXHN H1600 failure.
6. If the splitter problem is determined, call the operator for maintenance or replace-
ment.
7. If the problem is due to the end office equipment failure, call the operator to con-
firm it.
8. Too long connection cable between the splitter and ZXHN H1600 may cause poor
anti-interference performance and synchronization difficulty. Therefore, the con-
nection cable should not be too long.
9-2 SJ-20200218145027-006 | 2021-03-04(R1.0)