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Figure C-9/Q.714 - T1115320-88
Figure C-10/Q.714 (sheet 1 of 4) - T1115330-88
Figure C-10/Q.714 (sheet 2 of 4) - T1115340-88
Figure C-10/Q.714 (sheet 3 of 4) - T1115350-88
Figure C-10/Q.714 (sheet 4 of 4) - T1115360-88
Figure C-11/Q.714 - T1115370-88
Figure C-12/Q.714 - T1115380-88
Fascicle VI.7 - Rec. Q.714 PAGE79
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.
PAGE96 Fascicle VI.7 - Rec. Q.714
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
Fascicle VI.7 - Rec. Q.714 PAGE79
Figure D-1/Q.714 - T1115390-88
Figure D-2/Q.714 - T1115400-88
Figure D-3/Q.714 - T1115410-88
Figure D-4/Q.714 - T1115420-88
Figure D-5/Q.714 (sheet 1 of 2) - T1115430-88
Figure D-5/Q.714 (sheet 2 of 2) - T1115440-88
Figure D-6/Q.714 (sheet 1 of 2) - T1115450-88
Figure D-6/Q.714 (sheet 2 of 2) - T1115460-88
Figure D-7/Q.714 - T1115470-88
Figure D-8/Q.714 (sheet 1 of 2) - T1115480-88
Figure D-8/Q.714 (sheet 2 of 2) - T1115490-88
Figure D-9/Q.714 (sheet 1 of 2) - T1115500-88
Figure D-9/Q.714 (sheet 2 of 2) - T1115510-88
Figure D-10/Q.714 - T1115520-88
PAGE96 Fascicle VI.7 - Rec. Q.714