User's Manual Part 2

224 APCD-LM043-8.0 (DRAFT C)
Appendix E: Access Interface
EUM3003 INOP Button
NOTE: If you are trying to determine an EUM’s IP address, the gratuitous
ARP feature provides an alternative to using the INOP button.
The EUM transmits a “gratuitous” ARP (an ARP for its own IP
address) two seconds after power up. This gratuitous ARP can
be used to determine the IP address of an EUM if it is not already
known. The operator can either sniff the ARP packet on the
Ethernet interface, or look in the ARP table of a connected host.
The EUM3003 includes an Inoperative Mode (INOP) button. It is a recessed push button on
the connector end of the EUM. Use a paperclip or a small flat screw driver to push the button
gently. You will hear a soft click noise.
The INOP button provides the following functionality:
• Enables you to temporarily reset the IP address to 192.168.10.250 / 24 (Gateway
192.168.10.251).
• Allows for error recovery if the EUM3003 fails during the startup sequence (including a
corrupt boot line).
NOTE: The INOP button is NOT a RESET button. Pushing the INOP
button during normal operation will not reboot the unit.
CAUTION: The radio interface is not functional in INOP mode.
Using the INOP Button to Recover the IP Address
The EUM3003 may be reset to a default IP address by pressing the INOP button.
To Recover the EUM3003 IP Address
1. During the EUM30003 power up cycle, press the INOP button, hold it until the front
three LEDs flash, and then release the INOP button.
The unit starts in INOP Mode, with the IP Address set to 192.168.10.250 /24.
2. Ensure that the PC connected to the EUM3003 is on Ethernet subnet 192.168.10.0 /
24. If not, change the PC network settings. For instructions on changing the PC
network settings, refer to
To Configure PC Network Settings (Windows XP Operating
System)
on page 226.
NOTE: Restarting an EUM3003 in INOP Mode will not change the IP
address displayed in the BCF.
3. Open a Telnet session to the EUM3003. For instructions, refer to
Telnet Connection
on page 221.