AN2836 Freescale Semiconductor / Motorola, AN2836 Datasheet - Page 19

• Manufacturer Part Number: AN2836
• Description: Web Server Development with MC9S12NE64 and OpenTCP
• Manufacturer: Freescale Semiconductor / Motorola

Debugging Networks
Issues
Issues with network connectivity are typically due to an error in the network setup and configuration of
either the network or the remote devices. Three main network connectivity issues and their possible
solutions are described in this section:
Ethernet Connection Not Established
This connectivity issue means that the Ethernet transceiver on either the target or the host (or both)
cannot create a low-level link. This problem can be caused by:
Ethernet transceiver issues at startup occur if the embedded device was not initialized correctly by the
program. First, visually verify that the devices are physically connected. On the PC and the target
evaluation board, the link and speed LEDs should be active.
If the physical connection is visually verified and the problem still exists, check the status of the link in the
network settings dialog box as shown in
may show the status of the link on the task bar as shown in
“Network Cable Unplugged.”
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Ethernet connection not established
Network connection cannot be established
Network connection is established at the IP layer with Ping, but the devices are not communicating
Cat5 cable damaged or unplugged
Cat5 cross-over cable required, but a straight-through cable is used
Ethernet transceiver loss of power
Ethernet transceiver issue at startup
Mismatched Windows LAN card settings
Web Server Development with MC9S12NE64 and OpenTCP, Rev. 0
NETWORK
CONNECTION
STATUS ICON
Figure 12. Task Bar Showing Link Status
Figure
10. Also, if the network is configured correctly, Windows
(UNPLUGGED AS SHOWN)
Figure
12. The task bar shows the link as
Debugging Networks
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