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Appendix C: Troubleshooting
Diagnosing the Modem's Indicators
The Modem can be easily monitored through its comprehensive panel indicators. These indicators assist the network manager in
identifying problems the hub may encounter. This section describes common problems you may encounter and possible solutions.
1.
Symptom:
Power indicator does not light up (green) after power on.
Cause:
Defective External power supply.
Solution:
Check the power plug by plugging in another that is functioning properly. Check the power cord with another device. If these
measures fail to resolve the problem, have the unit power supply replaced by a qualified distributor.
2.
Symptom:
Link indicator does not light up (green) after making a connection.
Cause:
Network interface (e.g. a network adapter card on the attached device), network cable, or switch port is defective.
Solution:
2.1 Power off and re- power on the VDSL Modem.
2.2 Verify that the switch and attached device are powered on.
2.3 Be sure the cable is plugged into both the switch and corresponding device.
2.4 Verify that the proper cable type is used and its length does not exceed specified limits.
2.5 Check the Modem on the attached device and cable connections for possible defects.
2.6 Make sure phone wire must be connected between 4-BAND VDSL CO Modem and 4-BAND VDSL CPE Modem first,
when both are to be power on.
2.7 Replace the defective Modem or cable if necessary.
3.Symptom: VDSL Link cannot be established.
Cause: VDSL auto speed failure or phone cable length is over specification with the limit of 1.9km or not a 24 gauge phone wire with
twisted pair.
Solution:
3.1 Please make sure phone wire must be connected between 4-BAND VDSL CO Modem and 4-BAND VDSL CPE Modem
4-Band VDSL CO/CPE MODEM USER'S MANUAL Ver. A.2
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