This relationship identifies the list of component PTPs in the protection group.
The order of TP is significant for all groups. The first TP is always the EAST and the second is for the West. For 4F-BLSR the first two TPs are EAST and next two are West. The EMS may determine or designate any of the component TPs as East or West. For a 4-Fiber group, the TPs in the same direction are in the same span.
