Global supplier of packet-optical networking services, Transmode has announced the company's evolutionary SDN strategy for packet-optical transport networks with product availability starting in December. Transmode's SDN-enabled packet-optical networks will support fully automated multi-layer Path Computation Element (PCE) based path provisioning for all MPLS-TP, Ethernet and Layer 1 services. In addition, the network will also support heirarchical SDN controllers and multi-vendor environments through open standardised interfaces such as OpenFlow, PCEP and MTOSI. Transmode's SDN approach will also utilise virtual router functions using NFV functionality, offering operators the ability to support network virtualisation and end-to-end path provisioning across multi-vendor/domain networks. The first components of Transmode's SDN controller offering, which is part of Transmode's Enlighten (TM) multi-layer management/control suite, becomes available in December, with further capabilities to follow in later releases. All existing TM-Series nodes can migrate to the SDN environment without the need for hardware upgrades.