Study And Implementation Of Wireless Fax Access System Of CDMA Net Based G3 Fax

The wireless fax of CDMA (Code Division Multiple Access) net based G3-Fax, making use of CDMA wireless access technology, carry out the Group three file fax, which is used in PSTN (Public Switch Telephone Net) net as a rule. It makes fully use of the characteristic of wireless access technology. For example, the lower expense of building the communication net and the lower cost of manage. It will be used widely gradually.At abroad, the wireless fax of CDMA based G3-Fax has been making for commercial. Korea is keeping ahead in development research and applying this technology in the world. In my country, most of the studies of the new application based G3 file fax located IP fax based Internet. The study of wireless of CDMA based G3-Fax is resting on research phase. In 2003, the application of wireless fax of CDMA based G3-Fax has been staked by the National Nature Science Fund (No.60071029). They have done some test about wireless fax of CDMA in the ZTE switch net and make some progress, but there are some defects. The technology of the wireless fax, for example, the multi-pages fax, stability, and the rate of connection, are not satisfied with the need of practice application. Thinking over the actuality, we take a solution in our research, in which choosing a Fax Modem chip as Fax DCE (Data Circuit-Terminal Equipment), choosing a CPU, which is sixteen bits, as Fax DTE (Data Terminal Equipment), and program the wireless fax based CLASS 2 Fax Service according to the international standard fax control protocol. Choosing Fax Modem chip as DCE can simple the process of implement the protocol, improve the stability and compatibility of the wireless fax. Taking a CDMA module as interface of wireless communication can increase the rate of connection. The wireless terminal, according to this solution, has carried through on ZTE CDMA wireless test network and using network. In addition, the terminal equipment has been commercial.Though the development of wireless fax of CDMA based G3-Fax,which is based of TIA/EIA/IS-707-A.4 protocol in the CDMA net part and TIA/EIA/IS-592-A protocol in the terminal part, has been successful, the wireless fax that is based TIA/EIA/IS-707-A.7 protocol in the CDMA net part need more study. On the side, the wireless fax technology based G4-Fax will be the other aspect of application of wireless fax in the future.