This is the name of the transport tunnel that has been explicitly configured (statically assigned by the operator) to carry this pseudowire's traffic across the MPLS core, as opposed to whichever tunnel actually ends up active. This is the intended, provisioned binding rather than the real-time one, which matters when the pseudowire is set up to use a protected group of tunnels where the actual active tunnel can differ. If service disruption is suspected due to a tunnel change, comparing this configured tunnel name against cienaCesMplsPwActiveTunnelName tells the admin whether the PW is still riding its originally intended path.