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• Ensure the modem and PC are connected either by direct connection with a crossover CAT5 cable or both are connected to a hub or switch with standard CAT5 cables.
STH/STPro <--- Crossover CAT5 cable ---> PC Ethernet card (NIC)
= (Hub or Switch)
---> PC Ethernet card (NIC)
•Turn off power to the modem and disconnect the phone line to the modem.
•Set the IP and subnet of the PC NIC to be a static IP of 10.0.0.200 / 255.0.0.0
•Download this file, extract the STHPDRST.BAT from this ZIP file to the desktop:
STH Ping to Defaults BAT file
•Double click the STHPDRST.BAT file to run it. When the file runs, it will open a CMD prompt and display some text in reference to this process. The file will start issuing continuous ping commands after pressing 'any key' like the spacebar at the pause prompt.
•While the continuous ping commands are timing out, turn on power to the modem and wait.
•The power led on the modem should do the following: Red, blinking red, solid orange, solid green. Shortly after the power led turns solid green, the modem should reset to defaults and reboot. The power led will starting blinking red, and turn solid orange again. At this point press CTRL+C on the keyboard to break the endless ping cycle. Preferably before the power led turns solid green or it will reset the modem to defaults again. Answer N or n to the 'Terminate batch job?' question and press enter. This breaks the ping cycle and issues the proper ARP delete command for the Ping to Defaults.
•After the modem has been reset to defaults, be sure to log into the modem's webpages (http://10.0.0.138), disable DHCP, and delete all Bridge, PPtP, CIP, PPP, and Phonebook entries. This FAQ explains the procedure in more detail minus extra Pro entries. Then re-create the appropriate phonebook and PPP or Bridge entries. The STPro has an excessive amount of default entries that are not required and could introduce connection problems.
An interesting fact about the Ping to Defaults, the PC does not have to be in the same IP octet and subnet range as the modem. The modem's IP address should be 10.0.0.138 / 255.0.0.0 unless it has been changed. This is irrelevant for the Ping to Defaults. All that matters is the IP of the PC NIC be in the same octet range to the IP settings in the STHPDRST.BAT file. The STHPDRST.BAT file can be edited with any text editor like notepad.
Alternative to changing the IP of the PC NIC:
The STHPDRST.BAT can be edited to correlate to the current IP and subnet range of the PC NIC. If the PC NIC is 192.168.1.50, change all occurrences of 10.0.0.100 in the STHPDRST.BAT file to something like 192.168.1.200 and save the file. In the end, the IP of the PC will still have to be changed in order to log into the modem after it's been reset to defaults and reconfigure the modem accordingly. This alternative method is not recommended because of this, but is nonetheless an option for future reference.