SDAA112 September   2025 AM625

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Use Case
  5. 2Platform and Products
    1. 2.1 Hardware
    2. 2.2 Software
  6. 3Methods
  7. 4Overview of Steps to Bring Up the Interface and Establish A Connection
  8. 5Troubleshooting
    1. 5.1 Power and Initialization First
    2. 5.2 Verify Network Before PPP
    3. 5.3 Test Manual Dial First
    4. 5.4 Timing When Dialing Up
    5. 5.5 Serial Communication
    6. 5.6 Chat Script
    7. 5.7 PPP Options
    8. 5.8 Signal Strength and Antenna Setup
    9. 5.9 Modem Reset
  9. 6Summary
  10. 7References

6 Summary

Establishing a gateway connection through PPP on a cellular modem provides a simple and robust method for enabling remote devices to communicate with the internet when wired connectivity is impractical. A TI processor such as the AM625 can interface with a modem over UART or USB, and with Linux PPP support, the modem is treated as a standard network interface once the connection is active.

By combining modem initialization through AT commands with session management through pppd, the system creates a transparent bridge from IP-based applications to the cellular network. This approach is widely applicable in markets ranging from electric vehicle charging infrastructure to building automation, where reliable and remotely managed connectivity is essential.