Im looking at EBD050 and EBD070 and trying to read up on what type of modem chipset is on board? Anyone that got this information?
And is it possible to use only the USB-C without the RPI GPIO header, and if not, which GPIO header pins are required?
Greetings, @nordmcla,
Welcome to Teltonika Community!
Here are the chipsets that are implemented in Calyx devices. These chipsets are responsible for handling the cellular connectivity and overall modem performance, and they may vary depending on the specific model and its intended region or use case.
EBD050 : Quectel RG520N-EB
EBD070 : Quectel RG255C-GL
You can use the Calyx modem via USB‑C alone for power and cellular data - it will enumerate as a USB modem on your host.
However, full functionality requires the Raspberry Pi GPIO header, because essential modem control signals (PWR_KEY, MODEM WAKE, MODEM RESET) and optional features like PCM audio are only available through the header.
So for basic data use, USB‑C is sufficient; for reliable hardware control, the following GPIO pins are needed:
- PWR_KEY – modem on/off
- MODEM WAKEUP – wake from sleep
- MODEM RESET – reset the modem
- Power lines – 5 V/3.3 V (pins 1, 2, 4, 17)
- Optional: PCM audio and SIM_SELECT if those features are required.
For more information you can refer to these wiki articles:
I hope this helps! In case you have any additional questions, please don’t hesitate to let me know.
Best regards,
V.