SDH-SNCP-I and SNCP-N

SNCP/I: Sub Network Connection Protection with inherent monitoring. 
Switching criteria - Automatic: 
SNCP-I: 
LOS LOS 
LOF LOF 
LOP LOP 
AU-/TU-AIS 

SNCP/N: Sub Network Connection Protection with non intrusive monitoring. 
Switching criteria - Automatic: 
SNCP-N: 
LOS LOS 
LOF LOF 
LOP LOP 
AU-/TU-AIS AU-/TU-AIS 
HP-/LP-UNEQ 
HP-/LP-E-BER 
HP-/LP-DEG 
HP-/LP-TIM 
B3-/BIP-2-SD