ECM(太网控制模型)协议文档 TheUSBCommunicationsDeviceClassSpecification1.1containsgeneralCommunicationsClass specifications,anddetailsforsevendevicesubclasses.Thatspecificationhasbeeneditoriallyreorganized intoacommonUSBCDC1.2specification[USBCDC1.2]andasetofsubclassspecif