ZyXEL Communications Cable Modem, Руководство пользователя

Страница: 31 / 52

VLC1324G User’s Guide
31
C
H A P T E R
3
VLC Troubleshooting
This chapter covers potential problems and possible remedies. After each problem description,
some steps are provided to help you to diagnose and solve the problem.
3.1 The SYS or PWR LED Does Not Turn On
3.2 The ALM LED Is On
The ALM (alarm) LED lights when the line card is overheated or the voltage readings are
outside the tolerance levels.
Table 9 SYS LED Troubleshooting
STEPS CORRECTIVE ACTION
1 Make sure the power wires are properly connected to the power supply and the power
supply is operating normally. Make sure you are using the correct power source (refer to
the IES User’s Guide for details).
2 Make sure the power wires are connected properly.
3 Make sure the line card is properly installed.
4 The LED itself or the unit may be faulty; contact your vendor.
Table 10 ALM LED Troubleshooting
STEPS CORRECTIVE ACTION
1 Use the sys monitor show command to verify the cause of the alarm. See step 2 if the
unit is overheated, and step 3 if the voltages are out of the allowed ranges.
2 Ensure that the IES is installed in a well-ventilated area and that normal operation of the
fans is not inhibited. Keep the bottom, top and all sides clear of obstructions and away from
the exhaust of other equipment.
3 If the voltage levels are outside the allowed range, take a screen shot of the sys
monitor show command display and contact your vendor.