This Recommendation defines the APS protocol and protection switching operation for the linear
protection schemes for the Optical Transport Network at the Optical Channel Data Unit (ODUk)
level. Linear protection schemes considered in this Recommendatio
ITU-T G.873.1-2006 history
2014ITU-T G.873.1-2014 Optical transport network (OTN): Linear protection
2011ITU-T G.873.1-2011 Optical Transport Network (OTN): Linear protection (Study Group 15)
2006ITU-T G.873.1-2006 Optical Transport Network (OTN): Linear protection Study Group 15