Specifications

18 Data/Fax Rack Mounted Modem Card Configuration Guide
Appendix B – Upgrading Firmware
Your modem is controlled by semi-permanent firmware, which is stored in flash memory. Multi-Tech's firmware
remains stored in memory when the modem is turned off and can be upgraded as new features are added.
Checking the Modem Firmware Version
Check the current firmware version to determine if an update is needed:
1. Run a terminal program, such as HyperTerminal.
2. In the terminal window, type AT&F. Even if you cannot see the AT&F command on your screen, be sure to
type it completely, and then press Enter. If the modem does not respond with OK, repeat the AT&F
command.
3. Now type ATI3, press Enter and record your results. The firmware version should appear first in the
response, for example:
4. ACF3_V1.702a_V90_P21_FSH
5. The number after the V is the current version number.
Checking the Current Firmware Version
Identify the current version of the firmware at the Multi-Tech site. If your modem already has the current
firmware, there is no need to update it.
1. Go to http://www.multitech.com/setup/product.go and select your model from the Product drop down list.
2. Click Firmware. The firmware zip file name contains the version number. For example, hhgg702o.zip,
indicates version 702o.
3. Compare the version number on the modem to the version on the site. If the versions match, there is no
need to update.
Make sure you compare any letters following the version number. If there was a minor release, the letter
may change instead of the number.
Warning: The first digit of the new firmware must match the first digit of the old firmware, or the modem may
not work properly; e.g., if your current firmware version is 4.16, replace it only with 4.xx firmware, not
6.xx firmware.