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Updated: Sep 13, 2026

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Nortel 920-521 Exam Overview:

Certification Vendor:Nortel
Exam Name:Nortel Agile Communication Environment (ACE) Release Design & Engineering
Exam Number:920-521
Certificate Validity Period:Retired / no longer active
Exam Format:Scenario-based questions, Multiple choice
Available Languages:English
Exam Way:Typically delivered via authorized testing centers (historical Nortel certification program)
Pre Condition:Knowledge of enterprise telecommunication systems and IP networking recommended

Nortel 920-521 Exam Syllabus Topics:

SectionObjectives
Topic 1: ACE Architecture Overview- Protocol and signaling foundations
  • 1. VoIP and signaling principles
    • 2. Interworking with legacy telephony systems
      - System architecture and components
      • 1. Core network elements and roles
        • 2. Service delivery architecture
          Topic 2: Operations, Troubleshooting and Maintenance- System monitoring
          • 1. Fault detection and alerting
            • 2. Performance monitoring tools
              - Troubleshooting methodologies
              • 1. Call failure analysis
                • 2. Network issue diagnosis
                  Topic 3: Call Processing and Services- Feature services
                  • 1. Advanced telephony features
                    • 2. Unified communications services
                      - Call routing and control
                      • 1. Dial plan design and implementation
                        • 2. Routing policies and call flows
                          Topic 4: Design and Engineering Principles- Network integration design
                          • 1. Enterprise network integration
                            • 2. Service provider interoperability
                              - Solution design considerations
                              • 1. High availability and redundancy design
                                • 2. Capacity planning and scalability
                                  Topic 5: Quality of Service and Performance- Performance optimization
                                  • 1. Latency and jitter control
                                    • 2. Network tuning techniques
                                      - QoS design
                                      • 1. Traffic prioritization mechanisms
                                        • 2. Bandwidth management strategies

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