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About Your System 19
• Always attach an external device while your system and the device are
turned off. Next, turn on any external devices before turning on the system
(unless the documentation for the device specifies otherwise).
See "Using the System Setup Program" on page 35 for information about
enabling, disabling, and configuring I/O ports and connectors.
NIC Indicator Codes
Each NIC on the back panel has an indicator that provides information on
network activity and link status. See Figure 1-3. Table 1-3 lists the NIC
indicator codes.
Figure 1-3. NIC Indicators
System Messages
System messages appear on the screen to notify you of a possible problem
with the system. Table 1-4 lists the system messages that can occur and the
probable cause and corrective action for each message.
1 link indicator 2 activity indicator
Table 1-3. NIC Indicator Codes
Indicator Indicator Code
Link and activity indicators are off. The NIC is not connected to the network.
Link indicator is green. The NIC is connected to a valid link partner
on the network.
Activity indicator is blinking yellow. Network data is being sent or received.
1
2
book.book Page 19 Thursday, August 30, 2007 3:30 PM