Value,Description,Reference
0,No Request (NR),[RFC8227]
1,Reverse Request (RR),[RFC8227]
2,Unassigned,
3,Exercise (EXER),[RFC8227]
4,Unassigned,
5,Wait-to-Restore (WTR),[RFC8227]
6,Manual Switch (MS),[RFC8227]
7-10,Unassigned,
11,Signal Fail (SF),[RFC8227]
12,Unassigned,
13,Forced Switch (FS),[RFC8227]
14,Unassigned,
15,Lockout of Protection (LP),[RFC8227]
16-254,Unassigned,
255,Reserved,[RFC8227]