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Dual SIU Architecture for Transaction-based
Applications
There are two ways of architecting a dual-resilient
SIU520-based system for processing TCAP transactions.
■
Running the SS7 stack up to SCCP on the SIUs
■
Running the SS7 stack up to TCAP on the SIUs
In the first case, TCAP and potential layers sitting on top
of TCAP run on the application host(s) and an additional
piece of software is required on each SIU to distribute
TCAP transactions to multiple application hosts. This
software option is called distributed transaction server
(DTS). Figure 13 depicts this architectural difference.
Building Fault-tolerant SS7 Systems Using the Intel
®
NetStructure™ SIU520 SS7 Signaling Gateway Application Note
13
Figure 13. Two Different Architectures for a TCAP Processing SIU System
SIUA
SCCP
MTP
SIUB
SCCP
MTP
Ethernet
DTS
DTS
TC User TC User
A) Dual-resilient SIUs running SS7 protocol stack to TCAP
Host 0 Host N
. . .
SIUA
TCAP
SCCP
MTP
SIUB
TCAP
SCCP
MTP
B) Dual-resilient SIUs running SS7 protocol stack up to SCCP
Host 0
TC User
TCAP
Host N
TC User
TCAP
Ethernet
DTC
DTC
. . .