1. Tool support for Distributed Object Technology
Magnus Herner, S&P Media
T H E L A N G U A G E O F I N V E N T I O N
A Telelogic Company
S&P Media - A Telelogic Company
Lilienthalstr. 7, D München
Tel :

2. SDL in a distributed application
Most telecom applications
have many different
requirements.
SDL
System
C++
Java
Solution:
Use different techniques /
languages for different kind
of problems.
Use SDL for the real-time,
event oriented parts!

3. Specification and Description Language
Why SDL?
SDL
Specification and Description Language
International standard by ITU-T
Formal technique
Graphical representation
Object-oriented language
Message based language

4. All SDL components are object-oriented
Process Proc1 C1
[ ]
System Example
Bl1
C2 [ ] C3 R1
BlockBl1
Proc1
R1 [ ] R3
(1,1)
Proc2
(0,5)
Pr1
State1 R4
Procedure Pr1
Bl2
Sig1
x:=init
Architecture - Blocks
Behavior - Processes
Communication - Signals and Channels
Data and Functions - Abstract Data Types

5. Tool support in Telelogic Tau
UML MSC Text
ASN,1
Design
SDL
MSC
Test
TTCN
Executable application or
CORBA system
Executable Tests
C/C++
IDL
Requirement Capture and Analysis
Tool support for:
Requirement analysis
Specification
Design
Verification
Validation
Compilation
Test

6. SDL and CORBA
CORBA is a suitable way to enable SDL components to be used in a distributed environment.
SDL P1 P2 P3
Client
Server
ORB

7. SDL part as CORBA Server
If an IDL description is given, and should be implemented using SDL, it is possible to generate an SDL system stub from it, to which behavior is then added.
Add behavior
IDL
SDL P1 P2
Generate

8. SDL part as CORBA Client
If services should be request from an external CORBA server the IDL description is automatically converted
to one or more SDL packages, which are used by the SDL system.
IDL
Server
SDL package
Convert
SDL P1 P2
use

9. Methodology Support Object Model System analysis Paste as IDL
SDL
System analysis
Object design
Paste as
IDL
System design
Generate

10. From Analysis to Design
By copying an object in one model, and then pasting it as a new object in another model a link is also created between the objects.
DoorControl
Analysis model
Design model
interface DoorControl { };
paste as
paste as
Design model
DoorControl

11. In Conclusion Use SDL for the design and implementation
of real-time, event oriented parts
SDL technology is mature and well tested
for telecom systems
Tool support of SDL / CORBA integration
available