1
Scope
2
References
3
Terms and definitions
3.1
Terms defined elsewhere
3.2
Terms defined in this Recommendation
4
Abbreviations and acronyms
5
General considerations
5.1
Safety considerations for avoiding damage to the human eye and skin
5.2
Considerations to keep fibres damage-free
6
Procedures and guidelines
6.1
General
6.2
APR procedures for systems employing discrete optical amplification
6.3
APR procedures for systems based upon distributed Raman amplification
Appendix I – Examples of automatic power reduction architectures for
systems (including those based upon Raman amplification) deploying an optical
auxiliary channel
I.1
Considerations on using an OAC instead of a restart pulse for automatic
restart
I.2
Description of APR procedure using co-propagating OSC
I.3
Description of APR procedure using counter-propagating OSC
Appendix II – Description of automatic laser shutdown/automatic power
shut-down (ALS/APSD) procedures for single-channel point-to-point SDH
systems
II.1
Introduction
II.2
Single-channel point-to-point SDH without line amplifiers
II.3
Single-channel point-to-point SDH with line amplifiers
Appendix III – Example(s) of APR architecture for OAN systems based upon
Raman amplification
III.1
Further considerations on APR procedures in Raman amplified PON reach
extenders
Bibliography