CONTENTS

 1     Scope
 2     References
 3     Terms and definitions
 4     Abbreviations
 5     Type of transmission medium
 6     System margin
 7     System specifications
        7.1     Regenerator section lengths
        7.2     Error performance
        7.3     Receiver dynamic range
        7.4     Optical source
        7.5     Operating wavelength range
        7.6     Optical path allowances for multimode fibre systems
        7.7     Optical path allowances for single-mode fibre systems
        7.8     Equipment margin (Me)
        7.9     Wavelength division multiplexing
 8     Power feeding
 9     Systems for short haul applications
10     Working conditions
11     Overall design features
12     Maintenance strategy
       12.1     Type of supervision and fault location
       12.2     Fault conditions and consequent actions
13     Safety considerations
Appendix I – Calculation of regenerator section length
        I.1     Approaches
                  I.1.1     Worst-case approach
                  I.1.2     Statistical approach
                  I.1.3     Semi-statistical approach
        I.2     Statistical data form
        I.3     Examples
        I.4     An example of a statistical optical power budget