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"Telecommunication is communication at a distance by technological means, particularly through electrical signals or electromagnetic waves. ...
Electrical and electromagnetic telecommunication technologies include telegraph, telephone, and teleprinter, networks, radio, microwave transmission, fiber optics, communications satellites and the Internet." [Telecommunication. Wikipedia]
"A telecommunications service provider or TSP is a type of communications service provider that has traditionally provided telephone and similar services. This category includes incumbent local exchange carriers, competitive local exchange carriers, and mobile wireless communication companies. ...
While some people use the terms "telecom service provider" and "communications service provider" interchangeably, the term TSP generally excludes Internet service providers (ISPs), cable companies, satellite TV, and managed service providers. ...
TSPs provide access to telephone and related communications services." [Telecommunications service provider. Wikipedia]
The cross-functional flowchart example "Providing telecom services" was created using the ConceptDraw PRO diagramming and vector drawing software extended with the Cross-Functional Flowcharts solution from the Business Processes area of ConceptDraw Solution Park.
Cross-functional flow chart
Cross-functional flow chart, process, horizontal swimlanes, decision,
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How to Create a SDL Diagram Using ConceptDraw PRO

Specification and Description Language (SDL) diagram
Specification and Description Language (SDL) is intended to describe systems that switched state often and rapidly. An SDL diagram is a view of system, that can depict a single process, or complex relationships between a number of elements. The SDL diagram supports a nested hierarchy. A system is devided into blocks, each of them can be describes as a process, until finally one can see the initial procedures that make up each process. The advantage of this method is that a system can be viewed in manageable part thatcan be followed separately. ConceptDraw Specification and Description Language solution contains the library, with a SDL notation in a vector stencil graphics. The SDL solution also provides a set of samples, to show the level of hierarchical detail that is possible.