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Intel SIU520 SS7 manual TCAP Resiliency Based on DTS/DTC Option, Host

Models: SIU520 SS7

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

Host 0	Host 1	Host 2	Host 3
Application	Application	Application	Application

Ethernet

SIU520

TCAP

SCCP

MTP

SS7

Figure 16. TCAP Dialogue Groups Example

TCAP Resiliency Based on DTS/DTC Option

Alternatively, it is possible to distribute SCCP traffic to multiple application hosts using the distributed transac- tion server/distributed transaction client (DTS/DTC) soft- ware option, as shown on Part B of Figure 13. In this architecture, TCAP and potential application parts run on

each application host. Consequently, the total capacity of such a system depends on the number of application hosts, each host bringing an increment of 65,536 simultaneous dialogues. Please refer to the Intel® NetStructure™ SS7 Protocols DTS User Guide, Issue 2, for more information on the DTS/DTC software option.

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Intel SIU520 SS7 manual TCAP Resiliency Based on DTS/DTC Option, Host

Contents

Intel in Communications Application NoteBuilding Fault-tolerant SS7 Systems Using the Intel NetStructure SIU520 SS7 Signaling GatewayAbstract Table of ContentsConfiguring a Dual SIU Pair Appendix A Frequently Asked QuestionsTable of Figures Introduction AbstractOverview of SIU Operation Circuit-switched API OperationE-1 or T-1 Trunks Transaction-based API OperationManagement Interface Potential Points of FailureFailure of SS7 Links Link Failure of RoutesFailure of Signaling Interface Unit Failure of Power SupplyFigure 5. Dual SIU Architecture Connection to a Single Adjacent Signaling Point Routing Architectures of a Dual-resilient SIU SystemConnection to an Adjacent Mated STP Pair links and one inter-SIU link. Allocating a single link means Straight ConfigurationCrossed Configuration Comparison SubjectDual SIU Architecture for Circuit-Switched Applications Inactive Figure 12. Routing Following Failure of SIUA AdjacentA Dual-resilient SIUs running SS7 protocol stack to TCAP Dual SIU Architecture for Transaction-based ApplicationsB Dual-resilient SIUs running SS7 protocol stack up to SCCP 7 SS Failure of Application Failure of IP SubnetworkTCAP Resiliency Based on Dialogue Groups Host TCAP Resiliency Based on DTS/DTC OptionHost SIU520SS7 Network SS7 NetworkHardware Requirements Configuring a Dual SIU PairSS7 Network System ConfigurationChanges to the config.txt Parameter File Configuring the Inter-SIU LinkFigure 19. Example Configuration to an Adjacent SSP/SCP Routing ConfigurationCircuit Group Configuration Example ConfigurationRun-time Operations of a Dual-resilient SIU System Connecting a Host to Two SIUsFor SIUA For SIUBTransferring Control of a Circuit Group between SIUs Communicating with Both SIUA and SIUBGCTsetinstance GCTgetinstanceRe-synchronization of Circuit State Information Transferring the Circuit GroupTransferring Control Back Recovery of the Failed UnitCircuit Group Conflict Q If an SIU fails do I need to take any action? Q Do I need to activate circuit groups on a single SIU configuration?Q How many links should I configure in the inter-SIU link set? Q How can I tell if an SIU fails?1515 Route Ten Parsippany, NJ Phone

Host 0

SIU520

TCAP Resiliency Based on DTS/DTC Option