Abstract—"Door phone" is one of the essential communication apparatuses of the modern family. It is used to identify the visitor or for simple voice interlocution. The communication quality of this kind analog phone is not adequate; also, its functionality is also very limited. To cope with the trend of smart home networks development, this work employed a novel powerline communication chip to develop a networked digital video door phone system to replace the conventional ones. They transfer audio visual information and enhance the entrance guarding functions additionally. Three main tasks were developed in this project: construction of an outdoor video phone, construction of an indoor video phone server and porting an embedded operating system for this phone system. The experiment results of this project demonstrate the functionality of this phone system and the user's interaction with smart electrical home appliances over powerline.

Index Terms—Android operating system, powerline communication, surveillance system, video door phone.

C. H. Wei and S. A. Chen are with the Department of Electrical Engineering, Southern Taiwan University of Science and Technology, Tainan, Taiwan (e-mail: drwei@ mail.stust.edu.tw, m9920106@stust.edu.tw).