Multiplex communications – Pathfinding or routing – Through a circuit switch
Patent
1994-09-26
1997-02-11
Safourek, Benedict V.
Multiplex communications
Pathfinding or routing
Through a circuit switch
H04J 302
Patent
active
056028407
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
Known ISDN communication systems comprise clearly defined functional modules with standardized interfaces. A functional division over various control computers achieves the effect that an adaptation to different tasks and the introduction of new functional and service features does not affect the system structure.
The essential aspects of such a communication system, the "Siemens" switching system "EWSD", are described in a special issue "Dienstintegrierendes Digitalnetz ISDN" (Integrated Services Digital Network ISDN), Telcom Report 8, 1985, Siemens AG.
Both the hardware structure and the software structure of the switching system are broken down according to modular principles. The software, that is the programming component of the switching system, can be subdivided into the system program modules--operating system, call processing, signal transfer control, data protection and administration and maintenance.
While operating system functions are application-independent, the signal transfer control is an ISDN-specific subsystem. The system program module of the call processing provides the actual services for the user interface of the terminals or for the interfaces with the various networks.
European reference EP-A-0 405 829 discloses a telephone switching system which is implemented by means of independent software components, referred to as objects. The objects communicate with one another only by messages and symbolic names. A first object, which wishes to communicate with another object, informs the system existing at run time of an executable expression, known as a message. The message contains a symbolic name and the method name for the target object. Static and dynamic objects are provided, static objects defining the configuration of the exchange and being independent of temporary activities within the exchange. Dynamic objects are set up for a certain time, for example for the duration of a call. In this case, objects are created by the system existing at run time on the basis of an established component class as a pattern for how the particular component (instance) is to be constructed. The class includes a definition of the instance of data elements which are managed by the respective component, and also a definition of the set of methods (program text) which have sole access to the instance data. Dynamic objects are created for a specific purpose (for example for a telephone call) and destroyed when there is no longer any need for them.
In the area of the call processing system program module, still expected standardization activities make it particularly important to be able to carry out amendments and additions without great effort and at the same time to meet the real-time requirements demanded of the system.
SUMMARY OF THE INVENTION
The object of the present invention is to structure for an ISDN switching system at least the program module for the call processing in such a way that amendments and additions can be implemented in functional procedures with as little effort as possible and troubleshooting in the switching system is simplified.
This object is achieved according to the invention by an ISDN switching system with a system program module constructed in accordance with the principles of object-oriented programming for the handling of switched connections. The protocol modules used in protocol architectures for the standardization of functional switching procedures are represented as object-oriented structural elements which represent classes in the sense of object-oriented programming and of which objects are instantiated for connections and/or for calls and/or for signaling operations. A copy of the data area belonging to the structural element concerned is in each case set up in the data store as a kind of pattern, in which data individual to the connection or call or signaling are entered and which remains in existence only for the duration of a connection concerned or a call concerned or a signaling operation concerned.
Programming for call proc
REFERENCES:
patent: 5291479 (1994-03-01), Vaziri et al.
"Siemens" switching system EWSD, are described in a special issue Dienstintegrierendes Digitalnetz ISDN (Integrated Services Digital Network ISDN), Telcom Report 8, 1985, Siemens AG, pp. 15-21.
Meyer, B.: "Object-oriented Software Construction", Prentice-Hall, Englewood Cliffs, New York, 1988, or from Fraunheim, B. et al.: "Objektorientierte Programmierung" (C++-Programmierkurs, Part 1 . . . Part 4, Elektronik 1990, Issues 22 . . . 25).
Gunther Wolfgang
Magerl Gerhard
Ngo Ricky
Safourek Benedict V.
Siemens Aktiengesellschaft
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