Design Of A CAPI Driver Based On USB Interface

This paper describes how to realize the design of a COMMON-ISDN-API (CAPI) driver for ISDN Terminal Adapter based on USB interface. The driver accords with Win32 Driver Model (WDM), CAPI 2.0 and USB standard. In this thesis, the analysis and research on WDM, USB Bus and CAPI 2.0 standard are implemented. At the same time, a scheme is provided which combines CAPI with W7DM and the program is implemented. The paper deals with the architecture of WDM driver. The IRP interaction mechanism of the driver and the implement of CAPI function module, which plays an extremely important role in the scheme, are also discussed in the paper. The application software access to Internet, such as any WWW browser, CuteFTP, and so on, and the application program which according with CAPI are all supported by the driver. ISDN USB TA driven by the driver can not only be used to access to Internet, but also supply the communication of telephone and facsimile.