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This page provides information on VLBI standards that was previously available at this location. Some of this information may be out of date; it is provided here for reference information and will likely be updated in the future.
VLBI Experiment Definition (VEX): A framework for defining the setup details and schedule for a VLBI experiment. First defined in 1995, VEX has been widely adopted by the geodetic-VLBI community, and is more recently being adopted by the global astronomical-VLBI community as well. Efforts are now (2010) underway to extend VEX, called “VEX2,” to properly support new VLBI equipment and more complex experiments.
VLBI Standard Interface (VSI): Ratified in 2000 as a standard electrical/timing (VSI-H) and supporting software (VSI-S) specification, VSI has now been adopted in a number of various pieces of VLBI equipment developed at various institutions worldwide.
VDIF Transport Protocol (VTP): VTP defines how VDIF data should be streamed over standard network connections such as Ethernet.
VLBI Data Interchange Format (VDIF): Ratified in 2009 as a standardized VLBI raw-data format that is compatible with both recording systems and network transmission, VDIF is increasingly being adopted by the VLBI community.
VLBI File-Naming Conventions: In order to facilitate global VLBI data transfers, a file-naming convention for VLBI raw-data files was adopted in 2009.