CDC Ethernet Emulation Model (EEM)



MCCI's CDC EEM host drivers for Windows support network connectivity, product development, and system testing. Like the CDC Ethernet class, the CDC EEM class allows transport of Ethernet frames over USB. Unlike CDC Ethernet, EEM is not intended for connection to the Internet, but rather is intended for local network traffic. It also has reduced endpoint requirements compared to CDC ECM or NCM, and therefore may be more suitable for use with some USB device controllers.

Applications of the MCCI CDC EEM host driver include:

  • Testing USBSIM cards or accessing USBSIM cards from Windows applications (note that special hardware may be required for this use case)
  • Connecting embedded systems to PCs
  • Connecting smart products such as printers to PCs, so that the user experience using USB is identical to the user experience using Ethernet
  • Providing network connectivity on hardware with limited USB functionality

MCCI's EEM drivers support Windows XP through Windows 8.1, on 32-bit and 64-bit systems. They support single function or multi function devices. They support selective suspend when there is no network traffic to be sent in either direction.

EEM driver stack

Although MCCI's EEM support is the fastest in the industry, the EEM protocol has limited throughput when compared to other protocols such as NCM. If your product has high data throughput requirements, and you are flexible in terms of USB protocol selection, MCCI suggests you consider one of these alternatives.