3Com DSA-3CV1100-02 service manual State, Line Power

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TROUBLESHOOTING

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 Appendix D, “Technical Support”.

Power-on Self Test When the VCN AC is powered-up, each port of the VCN AC starts

(POST)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.

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

State	LAN	Line	Power	Notes
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	More than 30-seconds since
			Orange	power-on.