Amendment 1 to Recommendation ITU-T G.8151/Y.1374 (2014) provides: - Added cFOP related MI signals for Fault Cause Persistency function in Table 7-1, Alarm Reporting Control function in Table 7-2, Operational State function in Table 7-3 to align with ITU-T G.8121/Y.1381. - Add the APS related MI signals for provisioning and reporting for connection functions in Table 8-4 to align with ITU-T G.8121/Y.1381. - Removed APS related MI signals for provisioning and reporting for adaptation functions Table 8-2 to align with ITU-T G.8121/Y.1381. - Added new MI signals of intermediate request for LMo, DMo, SLo, and 1DMo to Table 8-3 to align with ITU-T G.8121/Y.1381. - Added new MI signals for proactive measurements to Table 8-1, to align with ITU-T G.8121/Y.1381, as: - Add MT_TT_ {So/Sk}_1SLp - Add MT_TT_ {So/Sk}_MI_1LMp_Enable (Also Removed MT_TT_ {So/Sk}_LMC_Enable from Table 8-1.1) - Add [1…M] to MT_TT_ {So/Sk}_{LMp/DMp/1DMp/1SLp}_OAM_Tool - Rename ODCV to CV in Table 8-3.2 to align with ITU-T G.8121.2/Y.1381.2.