Hello, I'm new to this mailing list. I hope I've understood the scope correctly! I've posted this question to ResearchGate but I haven't had any response. I'm hoping for some guidance from here. The question is: "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." -- Ing. Etienne-Victor Depasquale Assistant Lecturer Department of Communications & Computer Engineering Faculty of Information & Communication Technology University of Malta Web. https://www.um.edu.mt/profile/etiennedepasquale