ISDN Simulator - Management of Communications
The ISDN call simulator manages:
- The simulation behavior to establish/clear communications by using
the D channel signaling link.
- The level 3 emulator services provided by the AS-Interface.
The simulator uses the information defined in the profile to specify the
communications and their automatic sequencing.
The behavior is defined as:
- Outgoing if the simulator behavior is of the Generator
type.
- Incoming if the simulator behavior is of the Responder
type.
The Responder and Generator functions are not
exclusive:
- Their simultaneous validation implies the generation of selected outgoing
communications AND the acknowledge (acceptance or rejection) of incoming
communications.
- Their simultaneous non-validation implies holding in the inactive
state (no reaction from the Q931 emulator).
Each communication is defined by three STATES:
- ESTABLISH state which starts by a B channel allocation.
- ACTIVE state which corresponds to the established communication on the allocated B
channel.
- CLEARING state to clear the B channel.
The emulator is initialized by the choice of the protocol used (ETSI...) and the
operating options.
Each call refers emulator primitives:
- The S3-ESTABLISH
primitive:
- Enabled upon simulator initiative when the "Starting delay"
period has elapsed.
- Using the IE's defined by the dialogue for the SETUP message initializing
the communication establish phase.
- The S3-RELEASE
primitive:
- Enabled upon simulator initiative when the "Data state duration"
period has elapsed.
- Using the IE's defined by the dialogue for the first message initializing
the clearing phase.
The trace primitives are inserted in the Event-file and displayed by
the Event-Editor.
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