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- Figure C-9/Q.714 - T1115320-88
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- Figure C-10/Q.714 (sheet 1 of 4) - T1115330-88
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- Figure C-10/Q.714 (sheet 2 of 4) - T1115340-88
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- Figure C-10/Q.714 (sheet 3 of 4) - T1115350-88
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- Figure C-10/Q.714 (sheet 4 of 4) - T1115360-88
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- Figure C-11/Q.714 - T1115370-88
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- Figure C-12/Q.714 - T1115380-88
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- Fascicle VI.7 - Rec. Q.714 PAGE79
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- ANNEX D
- (to Recommendation Q.714)
- State transition diagrams (STD) for SCCP management control
- D.1 General
- This Annex contains the description of the SCCP management (SCMG) function
- according to the CCITT Specification and Description Language (SDL).
- For the SCCP management function, Figure D-1/Q.714 illustrates a
- subdivision into functional blocks, showing their functional interactions as well
- as the functional interactions with the other major functions (e.g. SCCP
- connectionless control (SCLC)). This is followed by Figures D-2/Q.714 to
- D-10/Q.714 showing state transition diagrams for each of the functional blocks.
- The detailed functional breakdown shown in the following diagrams is
- intended to illustrate a reference model, and to assist interpretation of the
- text of the SCCP management procedures. The state transition diagrams are
- intended to show precisely the behaviour of the signalling system under normal
- and abnormal conditions as viewed from a remote location. It must be emphasized
- that the functional partitioning shown in the following diagrams is used only to
- facilitate understanding of the system behaviour, and is not intended to specify
- the functional partitioning to be adopted in a practical implementation of the
- signalling system.
- D.2 Drafting conventions
- Each major function is designated by its acronym (e.g. SCMG = SCCP
- management).
- Each functional block is also designated by an acronym which identifies it
- (e.g. SSAC = Sub-System Allowed Control).
- External inputs and outputs are used for interactions between different
- functional blocks. Included within each input and output symbol in the state
- transition diagrams are acronyms which identify the functional blocks which are
- the source and the destination of the message, e.g.:
- SSAC « SSTC indicates that the message is sent from Sub-System Allowed
- Control to Sub-System Test Control.
- Internal inputs and outputs are only used to indicate control of timers.
- D.3 Figures
- Figure D-1/Q.714 shows a subdivision of the SCCP management function
- (SCMG) into smaller functional blocks, and also shows the functional interactions
- between them. Each of these functional blocks is described in detail in a state
- transition diagram as follows:
- a) Signalling Point Prohibited Control (SPPC) is shown in Figure
- D-2/Q.714;
- b) Signalling Point Allowed Control (SPAC) is shown in Figure D-3/Q.714;
- c) Signalling Point Congested Control (SPCC) is shown in Figure D-4/Q.714;
- d) Sub-System Prohibited Control (SSPC) is shown in Figure D-5/Q.714;
- e) Sub-System Allowed Control (SSAC) is shown in Figure D-6/Q.714;
- f) Sub-System Status Test Control (SSTC) is shown in Figure D-7/Q.714;
- g) Coordinated State Change Control (CSCC) is shown in Figure D-8/Q.714;
- h) Local Broadcast (LBCS) is shown in Figure D-9/Q.714;
- i) Broadcast (BCST) is shown in Figure D-10/Q.714.
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- PAGE96 Fascicle VI.7 - Rec. Q.714
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- D.4 Abbreviations and timers
- Abbreviations and timers used in Figures D-1/Q.714 to D-10/Q.714 are
- listed below.
- Abbreviations
- BCST Broadcast
- CSCC Cooordinated State Change Control
- DPC Destination Point Code
- LBCS Local Broadcast
- MSG Message
- MTP Message Transfer Part
- SCCP Signalling Connection Control Part
- SCLC SCCP Connectionless Control
- SCMG SCCP Management
- SCOC SCCP Connection-Oriented Control
- SCRC SCCP Routing Control
- SOG Sub-System Out of Service Grant
- SOR Sub-System Out of Service Request
- SP Signalling Point
- SPAC Signalling Point Allowed Control
- SPCC Signalling Point Congested Control
- SPPC Signalling Point Prohibited Control
- SS Sub-System
- SSA Sub-System Allowed
- SSAC Sub-System Allowed Control
- SSP Sub-System Prohibited
- SSPC Sub-System Prohibited Control
- SST Sub-System Status Test
- SSTC Sub-System Status Test Control
- UIS User In Service
- UOS User Out of Service
- Timers
- T(stat. info.) Delay between requests for sub-system status
- information
- T(coord. chg.) Waiting for grant for sub-system to go out of
- service
- T(ignore SST) Delay for sub-system between receiving grant to go
- out of service and actually going out of service
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- Fascicle VI.7 - Rec. Q.714 PAGE79
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- Figure D-1/Q.714 - T1115390-88
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- Figure D-2/Q.714 - T1115400-88
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- Figure D-3/Q.714 - T1115410-88
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- Figure D-4/Q.714 - T1115420-88
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- Figure D-5/Q.714 (sheet 1 of 2) - T1115430-88
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- Figure D-5/Q.714 (sheet 2 of 2) - T1115440-88
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- Figure D-6/Q.714 (sheet 1 of 2) - T1115450-88
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- Figure D-6/Q.714 (sheet 2 of 2) - T1115460-88
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- Figure D-7/Q.714 - T1115470-88
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- Figure D-8/Q.714 (sheet 1 of 2) - T1115480-88
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- Figure D-8/Q.714 (sheet 2 of 2) - T1115490-88
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- Figure D-9/Q.714 (sheet 1 of 2) - T1115500-88
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- Figure D-9/Q.714 (sheet 2 of 2) - T1115510-88
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- Figure D-10/Q.714 - T1115520-88
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- PAGE96 Fascicle VI.7 - Rec. Q.714
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