Abstract: A network adapter device such as a modulation bridge is provided for establishing a home network. The device comprises a modulation bridge including a control chip assembly complied with HomePlug, a plurality of device ports wherein one is adapted to connect to a computer via a network line and the other one is adapted to connect to a peripheral via a USB line, a coaxial cable jack, a modular telephone jack, and a power cord jack. Thus, the invention can connect to a power cord, telephone line cord, or coaxial cable for effecting a data transmission between a computer and a peripheral or between computers in the home network.