A
T
ROUBLESHOOTING
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
(POST)
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 Ta ble 1 4
.
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
Orange
More than 30-seconds since
power-on.
