Network Level Protection (OTN)-jp
Client 1+1 Protection Principles (Switching Triggered by a Protection Board)
Intra-Board 1+1 Protection Principles (Unidirectional Switching Using an OLP Board)
Intra-Board 1+1 Protection Principles (Unidirectional Switching Using an OTU Board)
Intra-Board 1+1 Protection-Principles (Bidirectional Switching Use DCP Board)
Optical Line Protection Principles (Unidirectional Switching)
Optical Line Protection Principles (Bidirectional Switching)