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A.2.3 Troubleshooting Connectivity Issues
Each network is unique, and network configuration and management are
outside the scope of this manual. This information is provided as a helpful
troubleshooting tool, but trained network specialists may be required to make
an Ethernet-enabled product work in a specific network. This section offers
common solutions to network connectivity issues experienced by CEFD
technical support personnel while developing or testing Ethernet-enabled
products using the Windows XP operating system.
The most common connectivity issue is neglecting to properly connect the LPOD to the
external PC Ethernet interface.
Check for link and activity Light Emitting Diode (LED)s to light up on the Network Interface
Controller (NIC) or network switch where the LPOD is connected to the Ethernet network. If the link
LED is lit, validate the Ethernet connection by pinging the LPOD at its IP address using the
Windows Command-line interface:
•
To access the Command-line interface, click Start Run... from the external PC's
Taskbar.
•
Type "CMD" (without the quotes) into the Run dialog box, and then click OK.
•
At the Command-line prompt (typically C:\>), type "ping 192.168.1.4" (without the
quotes).
If the IP address of the unit is not set to factory default (192.168.1.4), then use the unit's user-
assigned IP address. If the ping command responds with the "Request timed out." error message,
then the LPOD cannot be seen by the computer. Otherwise, if there is a time listed in milliseconds,
then the LPOD properly responded to the ping command and it is visible to the computer at the IP
address that was pinged.
Another common connection problem is due to conflicts in the Address Resolution Protocol
(ARP) table caused when a user connects two different pieces of hardware (with unique
MAC addresses) to a single Ethernet port while both pieces of hardware are configured with
the same Ethernet address.
This often happens when configuring new units set to the factory default IP address with a laptop
that has a single Ethernet port (e.g., CEFD's LPODnet M&C Netbook Accessory product). If there
are multiple units to be configured that are all set to the factory default IP address, then turn on one
unit at a time, and reinitialize the Address Resolution Protocol (ARP) table each time a new unit is
connected to the network as follows:
1. Check the values in the ARP table on the computer. This can be accomplished using the
Windows Command-line interface:
a. To access the Command-line interface, click Start Run... from the external
b. Type "CMD" (without the quotes) into the Run dialog box, and then click OK.
2. From the Command-line interface window, type "ARP -a" (without the quotes), and then
press the Enter key.
a. If the LPOD IP address is not displayed in the ARP table, then re-initialize the
b. If the unit's IP address is still not shown and the ping test has failed, then verify
Appendix A
Low Power Outdoor (LPOD) Amplifier/Block Up Converter (BUC)
PC's Taskbar.
ARP table by typing "ARP -d" at the Command-line window prompt. The LPOD IP
address should now be displayed when the ARP table is queried again.
the Ethernet settings of the unit using another remote-control interface that is not
dependant on the Ethernet port (e.g., EIA-485, EIA-232, or FSK).
A–8
Revision 15
MN-LPOD
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