ZyXEL Communications VLC1324G User Manual

VLC1324G User’s Guide

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.

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

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

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.