Represents the F4 end-to-end OAM flow VP operation states. It can take
one of the following operational state values:
vcAisState - AIS cell received or underlying physical layer
reporting transmission path AIS.
vcRdiState - RDI cell received.
vcDownRetry - OAM loopback failed, using retry frequency to
verify that the VC is really down.
vcUpRetry - OAM loopback successful, using retry frequency
to verify that the VC is really up.
vcUp - OAM loopback successful after up retry
verification.
vcDown - OAM loopback failed after down retry
verification.
vcNotManaged - No verification via loopback cells being
performed.
vpAisState - State when F4 AIS cell is received.
vpRdiState - State when F4 RDI cell is received.
vcInVpRdiState - The data vc is down as a result of VP failure
thorugh F4 Rdi oam cell.
vcInVpAisState - The data vc is down as a result of VP failure
through F4 Ais oam cell.
vcSegmentAisState - Segment AIS cell received.
vcSegRdiState - Segment RDI cell received.