3com DSA-3CV1100-02 Manual Do Utilizador

This appendix explains how to identify and correct problems, and how to 
perform related diagnostic tasks.

If you have problems that are not addressed in this chapter, contact 
3Com Technical Support or your service person. For technical support 
information refer to 

When the VCN AC is powered-up, each port of the VCN AC starts 
immediately the power-on self test (POST) sequence; the POWER LED 
turns orange. If the VCN AC is not powered, the power LED remains OFF. 
Check the power connections to ensure that the unit is connected to an 
ac power source.

The power-on self test runs individually for each VCN AC port and it 
verifies that every component of the port is fully functional. The power-on 
self test lasts for 30 seconds, during which time the power LED is orange. 
If the power-on self test is successfully completed, the power

 

LED for 

each port turns green. If the power-on self test detected a port failure, 
the power LED of that port remains orange. In this case, contact your 
supplier.

Check the front panel LEDs to determine each port’s status during the 
POST as presented in 

Table 14   Determining the VCN AC Port Status During the 30-second Self Test

Off

Off

Off

Off

VCN AC is not connected to a 
power source or failed.

Power-on

On

Off

Orange

Port failure

Off/On

Off/On

On in 
Orange

More than 30-seconds since 
power-on.