= Extending TIED to ProtoGENI: Demonstrating the TIED plug-in architecture = One of the key contributions of the TIED project is the ability to interconnect testbeds of different underlying architecture and programmatic interface to make unified experimental environments. This is accomplished through a very high-level experiment description architecture that is customizable at each participating testbed. The well defined interfaces provide a narrow waist at the points where testbeds interconnect. The customization at the testbed interface is referred to as a TIED plug-in (or access controller). Plug-ins currently exist for testbeds that export an Emulab interface and for DRAGON/OSCARS provisioned interconnection networks. We are currently developing a plug-in for the GENI Slice-Based Facility Architecture (SFA) as realized on [wiki:ProtoGENI ProtoGENI.] TIED is part of the overall DETER Control Architecture, which is summarized in the picture below: