Cisco Optical SDH Exam (SDH) : 642-321 Exam

  • Exam Code: 642-321
  • Exam Name: Cisco Optical SDH Exam (SDH)
  • Updated: Oct 21, 2026
  • Q & A: 59 Questions and Answers

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Cisco 642-321 Exam Syllabus Topics:

SectionWeightObjectives
SDH Fundamentals and Architecture25%- Frame structure and overhead bytes
- Synchronization and timing principles
- SDH standardization and hierarchy
SDH Configuration and Provisioning25%- Path and trail provisioning
- Performance monitoring parameters
- Protection switching mechanisms
SDH Equipment and Interfaces25%- Optical interfaces and line rates
- Multiplexers, regenerators, cross-connects
- Electrical to optical conversion
Maintenance, Troubleshooting & Standards25%- ITU-T G.707, G.783, G.806 compliance
- Alarm interpretation and fault isolation
- Error rate analysis and diagnostics

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