Abstract: Software Communications Architecture (SCA) as the heavily invested technical specifications set by the JTRS, it is the integration of structure to be followed by all the services and arms in the future wireless communication systems. The device components defined in the SCA system is software abstraction to underlying physical equipment, and provide a unified device interface for the upper waveform applications and services.This makes the upper waveform application development no need to care the implementation details of the underlying hardware equipment, so it can get rid of the restriction of the underlying hardware characteristics, and realize the portable and reusable waveform.This paper expounds the concrete application background of the Ethernet device components, and put forward the design and implement method for Ethernet device component based on SCA specification, it also provides a reference for the development of other device components in SCA system.