This is a small break-out board for M.2 (NGFF) type cellular / WWAN modems.

It allows you to insert a M.2 modem from any vendor, and it will provide you with:
  • mini USB 3 socket for connection to a USB Host (like your PC/Laptop or Embedded System)
  • 5V DC input for power supply (USB supply usually insufficient for a modem)
  • all unused m.2 pins on a 2.54mm break-out header
  • two SIM card slots for 2FF-sized SIM, USIM or RUIM cards (multi-SIM)
  • PCIe lane of modem exposed on USB3-A connector (to connect via related cable to PCIe host)

Particularly the break-out header is useful to get access to various signals exported in a non-standard fashion by some modem models, such as digital audio PCM.

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