Intel SIU520 SS7 manual Dual SIU Architecture for Transaction-based Applications

Building Fault-tolerant SS7 Systems Using the Intel® NetStructure™ SIU520 SS7 Signaling Gateway Application Note

A) Dual-resilient SIUs running SS7 protocol stack to TCAP

Host 0		Host N
TC User	. . .	TC User

		Ethernet
SIUA			SIUB
	TCAP		TCAP
	SCCP		SCCP
	MTP		MTP

B) Dual-resilient SIUs running SS7 protocol stack up to SCCP

Host 0					Host N
		TC User				TC User
				. . .
		TCAP					TCAP
		DTC					DTC
				Ethernet
	SIUA							SIUB
			DTS			DTS
			SCCP			SCCP

MTP

MTP

Figure 13. Two Different Architectures for a TCAP Processing SIU System

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.

13