In this example embodiment, {HEAD ~ an alternate protection scheme} is presented that avoids {TAIL ~ the need} to install a dedicated secondary optical line between the OLT 701A, B and the AG ONU 705 
In this example embodiment , { HEAD ~ an alternate protection scheme } is presented that avoids { TAIL ~ the need } to install a dedicated secondary optical line between the OLT 701A , B and the AG ONU 705
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH