IES-6000M User’s Guide

65

C

H A P T E R

4  

Hardware Troubleshooting

This chapter explains how to troubleshoot the system hardware. 

4.1  The PWR LED Does Not Turn On or Is Blinking

The 

PWR

 light blinks if the input power for the fans is not stable and is off if there is no input 

power. The 

PWR

 light stays on if the input for the fans is normal.

4.2  The ALM LED Is On

The 

ALM

 LED is on when at least one fan has failed in the fan module. Working fans emit a 

low buzz and blow air. If the fans are not working properly, refer to 

Section 3.1 on page 59

 for 

instructions on changing a fuse or changing the fan module.

4.3  No Voice on an ADSL Connection

The ADSL line cards allow the telephone wiring used for DSL connections to also 
simultaneously carry normal voice conversations.

Table 1   

PWR LED Troubleshooting

STEP

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 

Appendix A on page 71

). Make sure the power supply modules are turned ON. Refer to 

Section 3.2 on page 62

.

3

The LED itself, the fan module, or the unit may be faulty; contact your vendor.

Table 2   

Voice Troubleshooting

STEP

CORRECTIVE ACTION

1

Make sure the subscriber has a POTS splitter properly installed.

2

Check the telephone wire connections between the subscriber and the MDF(s).

3

Check the telephone wire and connections between the MDF(s) and USER port(s). Refer 
to the pin assignments in the line card User’s Guide.

4

Check the telephone wire and connections between the MDF(s) and the CO port(s). Check 
the telephone wire mapping on the MDF(s).

5

Check the connection from the MDF(s) to the PBX or the telephone company PSTN or 
ISDN switch.