VSI (VLBI Stanard Interface) specification
is a standard specification of network data
transfer prococol for VLBI data.
There are standard specifications for VLBI equipment for Hardware
and for software (control)
The specification of
VLBI Standard Interface (VSI)
is authorized by
International VLBI Service (IVS) and it is proposed under the
for Network data transfer
However the VSI-E is comprehensive and its software suite (C++ class
library) is well designed, VSI-E
itself was not widely delopied in the world VLBI community. Only VOA-200
(VLBI Optical Adapter) developed by Prof. Kawaguchi of NAOJ for VLBI
data transfer has employed the VSI-E and it enabled 8Gbps realtime data
transfer from VLBI data sources.
Note: The idea of VLBI Standards of
e-VLBI has been realized by VDIF (VLBI Data Interchange Format) and
VTP (VDIF Transport Protocol) in 2009.
VLBI Data Interchange Format Specification
In the 7th eVLBI workshop held at Shanghai in 2008, necessity of international
common data format specification has was intensively
discussed. Consequently VLBI task forece to make a proposal of common
data format has placed. Alan Whitney(MIT), Mark Kettenis(JIVE), Chris
Phillips(ATNF) and Mamoru Sekido(NICT) have discussed the specification
mainly by e-mail conversation. That common format is named VDIF (VLBI
Data Interchange Format) The
first version of VDIF specification has been
ratified in the e-VLBI workshop heldt at Madrid in 2009.
VDIF allows extension version for the usage of extended header
area. NICT's extension version is also available from the same web page.
VDIF Transport Protocol Specification
As a transport protocol of VDIF over the network has been also discussed
and the first version of VDIF Transport Protocol
(VTP) is accepted in the Task Force.