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Building Fault-tolerant SS7 Systems Using the Intel
®
NetStructure™ SIU520 SS7 Signaling Gateway Application Note
Table of Contents
Abstract 1
Introduction 1
Overview of SIU Operation 2
Circuit-switched API Operation 2
Transaction-based API Operation 3
Management Interface 3
Potential Points of Failure 3
Failure of SS7 Links 4
Failure of Routes 5
Failure of Power Supply 6
Failure of Signaling Interface Unit 6
Routing Architectures of a Dual-resilient SIU System 7
Dual SIU architecture for Circuit-switched Applications 10
Dual SIU architecture for Transaction-based Applications 13
Failure of IP Subnetwork 15
Failure of Application 15
Configuring a Dual SIU Pair 17
Hardware Requirements 17
System Configuration 18
Changes to the config.txt Parameter File 18
Configuring the Inter-SIU Link 18
Routing Configuration 19
Circuit Group Configuration 19
Example Configuration 19
Run-time Operations of a Dual-resilient SIU System 20
Connecting a Host to Two SIUs 20
Communicating with Both SIUA and SIUB 21
Transferring Control of a Circuit Group between SIUs 21
Activating and Deactivating Circuit Groups 21
System Initialization 21
Failure Detection 21
Transferring the Circuit Group 22
Re-synchronization of the Circuit Sate Information 22
Recovery of the Failed Unit 23
Transferring Control Back 23
Circuit Group Conflict 23
Appendix A: Frequently Asked Questions 24
Appendix B: For More Information 24
Appendix C: Abbreviations 24