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LPOD C-, X-, or Ku-Band Outdoor Amplifier / Block Up Converter (BUC)
Appendix A
connectivity issues experienced by Comtech EF Data 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 LEDs to light up on the 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., Comtech'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:
• First, check the values in the Address Resolution Protocol (ARP) table on
the computer. This can be accomplished using the Windows Command-
line interface:
A–9
MN-LPOD
Revision 14
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