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Retrieved from "http://wiki.openmoko.org/wiki/CDC_ACM"
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USB CDC ACM (Universal Serial Bus - Class Definition for Communication Devices - Abstract Control Model) supports serial communication (including AT-commands) over USB.

CDC ACM is used to access the U-boot bootloader prompt over USB (see: U-boot#Using_usbtty_from_Linux).


Specification

http://www.usb.org/developers/devclass_docs/usbcdc11.pdf (3.6.2.1)

See http://wiki.openmoko.org/wiki/USB_CDC_ACM from more information