SNAX/APC Configuration and Management Manual

Planning for SNAX/APC
SNAX/APC Configuration and Management Manual—138787
2-4
Dynamic Structures
The resource control block (RCB) represents a conversation. The RCBs represent the
connection of a TPI to a half session (HS). This connection is dynamically created and
destroyed. The RCB identifies the local TPI and half session in conversation, as well as
the remote LU and mode name (in case a conversation is allocated, but no session is
immediately available).
Half sessions contain instances of the data flow control and transmission control layers
of SNA. These enforce protocol rules for conversation data exchange, and transform
message units to a format suitable for the path control network. HS 5 and HS 6 represent
sessions that are in the pool, still active but waiting to be allocated to a conversation.
Figure 2-2
does not show partner LUs or partner modes created dynamically by
SNAX/APC.
Figure 2-2. Dynamic Data Structures
008CDT .CDD
TP
2
TP
1
TP
3
TP
4
Mode
2
Mode
1
Mode
1
Mode
2
Partner
LU 1
Partner
LU 2
Mode
3
TPI
B
TPI
A
RCB
2
RCB
1
HS
2
HS
1
TPI
C
RCB
3
HS
3
TPI
D
RCB
4
HS
4
HS
5
HS
6
Local LU Information
Association of processes via RCB dynamic data element
Association of process to static data element
Legend
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