Transcript
euros
ISDN ISDN (Integrated Services Digital Network) In the last decade ISDN has been well established on the European market. Due to digital data transfer at a much higher speed compared to analog telephone networks (up to 128 kBit/s of user data) ISDN is used in various areas of applications: • Answering machines • Fax • Remote maintenance • Remote control of machines • PBX • Internet access (PPP over ISDN) However, using ISDN means large efforts. A protocol stack for the connection management via the D channel must be implemented, as well as a protocol stack for data transfers via the B channels. This requires knowledge of the various ISDN protocols as well as of various ISDN peripheral controllers.
User interface With the EUROS ISDN stack the digital telephone network can be utilized easily. Thanks to CAPI (version 2.0) being used as programming interface the application engineer only requires limited knowledge of the inner workings of ISDN. The CAPI (Common ISDN application interface) is the best known and most common interface to ISDN stacks. Using simple functions connections can be established and data can be transferred.
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The CAPI is not only a simplified interface to the application. It also performs all management tasks that are required when • multiple applications access one or more controllers, or • one application accesses multiple controllers The CAPI also buffers data for the application.
Technical data: • Memory requirements: >= 35 KB ROM, >= 12 KB RAM. • Supported D-channel protocols: Q.921 and Q.931. • Supported B-channel protocols: transparent data transfer, X.25, user-defined protocols. • Usable for arbitrary devices • Areas of application: remote maintenance, remote control of machines, answering machines, fax, Internet access. • Management of unlimited number of controllers and applications. • Supported hardware: Siemens IPAC PSB 2115 (ask for others).
For connection management the European standard protocols Q.921 and Q.931 are supported. The user can check all parameters of an incoming call: caller number, compatiblity (eg. fax, telephony, unrestricted data, etc.). For data transfers via the B channels several protocols are supported (transparent data, X.25, Q.921). The ISDN stack also offers a way to insert user protocols between CAPI and device driver. Data transfer control can be disabled to integrate hardware controllers with their own B channel transfers (like Siemens ARCOFI).
Issue 5/2003
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