"I'm trying to identify trends in adoption of transport technology in the metro-area. If legacy is SDH/SONET and its successor in circuit transport is OTN, what are network providers implementing and planning to implement as transport technology in the metro area? For example, are packet transport technologies being considered as a replacement? As a complementary technology? By packet transport technologies, I am thinking of PBB-TE and MPLS-TP but ultimately, the problem regards how network providers are balancing circuit-transport and packet-transport technologies in current and planned deployments."