The operational state of the trail termination point (TTP).
up(1). The TTP is up and a connection is established to all
destinations. If the connection is 1+1 protected, both the
channels are established to all the destinations.
down(2). The connection is down to all destinations. The
itsSrcTtpFailure describes the fault.
unknown(4). The TTP is in an unknown state due to some
internal error.
dormant(5). The TTP is ready and is waiting for a connection
to be established.
partial(9). The connection is established to some but not all
the destinations. Or, if the connection is 1+1 protected,
only one of the channels are established.