NV-450M/S: G.fast Master Modem+ G.fast / VDSL2 / V35b Slave Modem USER’S MANUAL Ver. A.4
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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. Check the terminal block make sure to fasten the power cord.
If these measures fail
to resolve the problem, have the unit power supply replaced by a qualified distributor.
2. Symptom:
NV-450M/S both cannot handsharking after making a connection.
Cause:
Network interface (ex. a network adapter card on the attached device), network cable, or switch port
is defective.
Solution:
2.1 Verify that the switch and attached device are power on.
2.2 Be sure the cable is plugged into both the switch and corresponding device.
2.3 Verify that the proper cable type is used and its length does not exceed specified limits.
2.4 Check the modem on the attached device and cable connections for possible defects.
2.5 Make sure that the phone wire must be connecting NV-450S first, when powered on.
2.6 Replace the defective modem or cable if necessary.
2.7 Checking Phone wire length if exceed 600m(1968ft)