1
Scope
2
Abbreviations and acronyms
3
Background – Fibre protection
3.1
PON system components – Failure rates
3.2
FIT – Failures in time and MTBF
4
PON protection use cases
4.1
Large numbers of subscribers per PON line card
4.2
Business and mobile backhaul services
4.3
PON reach extenders
4.4
Emergency services
4.5
PON maintenance
5
Protection architectures
5.1
Type A
5.2
Type B
5.3
Dual parented Type B protection
5.4
Type C protection
5.5
Extra traffic for Type C protection
5.6
Type C protection using link aggregation
5.7
Type D – Deprecated
5.8
Type B with N:1
6
Availability and switching speed goals
6.1
Availability in an unprotected PON
6.2
Assumptions for availability calculations
6.3
Availability of an unprotected PON
6.4
Protection path monitoring
6.5
Switching speed and impact on availability
7
Fast failure detection
8
Fast protection switchover mechanisms
8.1
Ranging before switchover (pre-ranging)
8.2
Ranging after switchover (limited re-ranging)
8.3
No pre-configuration of standby OLT EqD values per ONU (fast ranging)
8.4
Equalization-delay-agnostic protection switch
8.5
Typical practice of fast protection switchover mechanisms and viability
analysis
9
Recommended architectures versus use cases
Bibliography