FS Requirements and Considerations
Ed Himwich, NASA/GSFC/NVI
Communication Issues
Media
Ethernet, USB, or …
Command/Response
All settable parameters should readable
Parameter parallelism
Device Response time
Device should not go catatonic for long execution
commands
Time-out mechanism
VSI-S specifies that after a time-out device should be
re-opened
29-30 May 2008
US VLBI Technical Meeting, MIT Haystack Observatory
2
Data Issues
Calibration Data
Corey/Himwich e-mail August 2006
Per channel calibration
Track AGC changes
Adequate data rate
Synchronous detection desired
Phase-cal extraction
Multiple tones per channel
Adequate data rate
Adequate precision
Phase-cal control also desired
Access to system and module test feature
29-30 May 2008
US VLBI Technical Meeting, MIT Haystack Observatory
3
Schedule Issues
Interface Specifications
Drafts needed soon
Implementation
When is it needed for operations?
At what points in the development process would it be
helpful?
When will modules be available for interface testing?
Resources
…
29-30 May 2008
US VLBI Technical Meeting, MIT Haystack Observatory
4