Software Design Of The Family Integrated Service Terminal

With the rapid development of society and technology, we have entered the times of information. People look forward to multimedia wide-band integrated services net which can provide remote teaching, remote working, remote medical treatment, video telephone, voice on demand and so on. Now following the development of net technology, much wide-band access network technology appears. So it is possible to provide integrated services. The project of the paper is to develop new user access equipment in wide-band access network. The equipment can provide digital television service, Internet service and IP telephone service which are universal requirement of scriber.By analyzing the requirements of the family integrated services terminal (IST), the services, the manner and the capability are definitely defined. According to the situation of our country the scheme is put forward that computer, analog television and analog telephone (and simple digital telephone) are the platform of Internet, digital television and IP telephone. And the scheme of circuit is put forward. Then the demand of software is analysed. According to the principal of easy transplant, good compatibility and easily expanding, the software scheme of family integrated services is designed and the function of each module is compartmentalized.IST is a complicated system. So embedded operation system is selected to complete the fundamental function such as management of task and memory and so on. Considering the duration and cost of the project, the operation system linux is selected. The paper establishes the bottom software environment. It includes transplanting bootloader, reducing and compiling the kernel of linux, designing the file system according to the requirement of IST.Digital television is one of the modules of IST which needs many modules to coworking. The middle ware of digital television is finished in IST; however, transport stream's demultiplex is finished in HI2016. In the paper the management of devices and how to edit character device driver in linux operation system are introduced, the demand of interface between integrated services terminal and HI2016 is analyzed, and the codes for driver of the interface ar edited.The module of IP telephone is another module of IST. The main aim of the paper is to design the software. In the paper H.323 protocol and SIP protocol applied in IP telephone and the demand of the software are analyzed, open-code protocol stack of Openh323 is transplanted, the driver for sound coding and decoding module is edited, the flow of application program is designed and the codes are edited.The bottom environment of IST is put up and the experiment result is put forward in the paper. All the codes in other modules of the paper are cross-compiled and added to the target system.