휴대폰과 유선전화를 위한 다기능 접속장치의 설계 및 구현

Abstract

As recently, environment of electromagnetic waves is gradually deteriorated in Korea and issue of electromagnetic wave's harmfulness is proposed, it is available to sell only if evaluating test for harmfulness to human body should be passed when newly developed mobile phone is submitted as mode registration for sale of domestic market since April 2002. Additionally, Ministry of Information & Communication establish 5-year general policy of environment preservation for electromagnetic waves which should be in force during 2003 - 2007 and a lot of researches are going on in progress.

Mobile phone developing company is considering electromagnetic wave's non-absorption rate on design stage when this company start to develop new model and working on various measures to pass on adaptability test of electromagnetic wave's non-absorption rate on finished stage which is eventually, going on sale as optimization.

However, we acknowledge existing electromagnetic wave's harmfulness and even lots of people have been developing products which diminish electromagnetic wave, users request harmlessness from electromagnetic wave and simultaneously, request convenience which result in difficulties for development of related products.

Therefore, the goal of this dissertation is to design and realize MFI(Multiple Function Interface) which enables efficiency and convenience by using cable phone to receive phone-call from mobile phone or make phone-call to mobile phone in order to diminish exposure time to electromagnetic wave which gives influence to human body and make the best use of existing cable phone and combine external various interfaces which connect PSTN(Public Switched Telephone Network) and computer.

Additional interface connecting function is also added to MFI in order for user's convenience. It is materialized that to make signal change will make conversation through cable phone which phone-call is actually mobile phone received and to make user avoid direct contact to mobile phone when make conversation which will diminish exposure time to electromagnetic wave.

Further, it has not only original function as transfer from mobile phone conversation to cable phone conversation but also has phone call function by use of cable phone because it is designed MFI could acknowledge specific phone number which stored at address list in the mobile phone.

This function enables user to use relatively cheap priced cable phone network which could be possible to save phone bill and to make phone call by only one time key touch without additional dialing. Additionally, according to development of mobile phone's capability, as it is possible various data such as image, melody, moving image and address list, etc could be saved at inside memory of mobile phone, these data are easily interchanged because it is available to connect to computer through MFI's USB(Universal Serial Bus) port. This dissertation is organized as follows.

At chapter II, various interface structure and characteristic of cable & mobile phone which MFI is materialized and applied are explained here. Use status of Cable & mobile phone, kinds of mobile phone service and AT Command of each telecommunication service providers which could be actually used at MFI are also explained. At chapter III, MFI's software which is multiple interface equipment by making use of mobile phone & cable phone is designed and hardware is materialized based on it. At chapter IV, it is explained that the way that make conversation with cable phone which mobile phone actually received call in use of materialized MFI, receiving way when call is received through public phone exchange network, the way of how to make call in use of phone number in mobile phone. Test and study are done about way of USB connecting port support. At chapter V, finally, conclusion is made.