Network operators are deploying Software Defined Networks (SDN) to enable programmability of their networks for efficiency, speed of deployment and new revenue-generating network services.  Widespread adoption of the programmability paradigm depends on the availability of common or standardized APIs that allow access to domain specific attributes and mechanisms without requiring the API itself to be specific to the vendor or technology. The Transport API (T-API) is designed to allow network operators to deploy SDN across a multi-domain, multi-vendor transport infrastructure, extending programmability across their networks end-to-end.

By working through the specifications, rigorous interoperability testing and validation, the OIF has substantiated T-API as the Northbound Interface (NBI) of choice. The OIF, in collaboration with industry leaders, has helped establish a foundation for open, programmable networks that allow operators to efficiently deliver dynamic multi-domain connectivity services to the market.

Upcoming Speaking

  • OFC 2019March 7, 2019 at 11:15am
    OIF Panel on Showfloor: “The Path to Open, Interoperable Optical Networking
    Moderator: Dave Brown, OIF Communincations Director, Nokia
    Panelists: Lyndon Ong, OIF MA&E Co-Chair, Ciena; Jonathan Sadler, OIF Networking Interoperability WG Chair, Infinera; Victor Lopez, Telefonica

Webcast with Lightwave
Assuring Open Optical Networking Interoperability

Press Releases


Past Speaking

  • OFC 2018
  • Optinet China 2018
  • NGON and DCI Europe
  • SDN NFV World Congress

For more information on this project contact Jonathan Sadler, Networking Interoperability Working Group Chair (acting) at

For information on other OIF current projects, please see OIF Current Work

For public OIF Implementation Agreements, please see Implementation Agreements (IAs)