Abstract: Ethernet communication apparatus, bridge thereof and connection device are disclosed. The Ethernet communication apparatus can draw off a required +5V DC for operation from a USB port of computer without an installation of built-in or external DC power adaptor. The bridge is coupled to power terminals of Ethernet RJ45 port and USB port of the computer via the connection device. The communication apparatus of the invention thus can draw off power from the USB port of computer and perform an Ethernet signal modulation and transmission at the same time.

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.