SR TSY 001130 : ISSUE 1

1 PURPOSE
2 INTRODUCTION
3 PRE-TEST PLANNING
3.1 Training
3.2 Review of Architecture
3.3 Review of Findings
3.4 Site Review
3.5 Test Script Preparation
3.6 Coordination
3.7 Trial Procedure
4 SITE TESTING
4.1 Preparation of Equipment
4.2 Test Conditions
5 PARAMETERS MEASURED
6 TEST DESCRIPTION
6.1 Preliminary Reliability Tests
6.1.1 Switchover Test
6.1.2 Diagnostics Test
6.1.3 Basic Operations - Non-Redundant Units
6.1.4 Basic Operations - Redundant Units
6.1.4.1 Two Units in a Simple Parallel Redundancy
6.1.4.2 Redundant Units in Various Configurations
              A. Load-Sharing Units
              B. Cross-Connect Units
6.2 Reliability Architecture Tests
6.2.1 Reliability Fault Tolerance Tests - Single Fault
6.2.1.1 Single Fault in Non-Redundant Equipment
6.2.1.2 Single Fault in a Parallel Redundant Pair
              A. Fault in an Active Unit
              B. Fault in a Standby Unit
6.2.1.3 Single Fault in Various Redundant Configurations
              A. Load-Sharing Capability Test
              B. Cross-Connect Capability Test
              C. Bypass/Isolation Capability Test
6.2.1.4 Single Fault in Non-Service-Affecting Equipment
              A. Non-Service-Affecting Failure Rate
              B. I/O Device Test
              C. Disk/Tape Operability Test
6.2.2 Reliability Fault Tolerance Tests - Multiple Faults
6.2.2.1 Two Faults in a Parallel Redundant Pair
6.2.2.2 Two Faults in Cross-Connect Equipment
6.2.2.3 Other Multiple Fault Conditions
6.2.3 Reliability Fault Tolerance Test - Memory Errors
6.2.4 Reliability Fault Tolerance Test - Fault During
              Operation, Administration and Maintenance Activity
6.3 Reliability Parameter Tests
6.3.1 Recovery Time
6.3.2 Repair Time
6.3.3 Temperature Profile
6.4 Operations Reliability Tests
6.4.1 Remote Unit Test
6.4.2 Growth Equipment Reliability Test
6.4.3 Software Overwrite (Patch) Capability Test
6.5 Environmental Reliability Tests
7 ANALYSIS OF TEST RESULTS AND REPORTING
8 GLOSSARY
9 REFERENCES
LIST OF FIGURES
Figure 1 Non-redundant Units in Active/Out-of-Service Mode
Figure 2 Redundant Units in Active/Standby Mode
Figure 3 Redundant Units in Various Configurations:
              Load-Sharing Example
Figure 4 Redundant Units in Various Configurations:
              Cross-Connect Example
Figure 5 Non-Redundant Unit Faults
Figure 6 Single Fault in the Active Unit of a Redundant Pair
Figure 7 Single Fault in the Standby Unit of a Redundant Pair
Figure 8 Single Fault in Load-Sharing Equipment
Figure 9 Single Fault in Cross-Connect Equipment: Example 1
Figure 10 Single Fault in Cross-Connect Equipment: Example 2
Figure 11 Two Faults in a Redundant Pair
Figure 12 Two Faults in Cross-Connect Equipment
LIST OF TABLES
Table 1 Notation for Figures
Table 2 Four Basic Configurations

Describes Reliability and System Architecture Testing (RSAT) performed by Bellcore as a method for assessing the reliability characteristics of a switching system. These characteristics include fault tolerance, fault detection and system recovery and the effects of these actions on call processing, billing data, maintenance visibility and trouble detection and notification. This document also provides an overview of the types of RSAT tests, the necessary pretest activities and the equipment and test conditions typically needed to perform such tests.