Unformatted text preview: n at the
intersection of the respective row and column. State transitions are indicated by State
numbers in parentheses; thus ‘(S2)’ indicates ‘go to State Number 2’. See figure C-1.
NOTE - Each of the State Tables describes the processing for one independent Virtual
IF THIS "EVENT" HAPPENS WHILE FOP OR FARM IS IN THIS "STATE"... ... WAITING
FOR "ACK" ... S1 STATE S2 S3 EVENT .
IS PERFORMED "ACK"
. THIS MEANS: "AFTER PERFORMING 'SET COUNTER
TO 1', GO TO STATE 3 AND WAIT FOR THE NEXT EVENT". Figure C-1: Mapping of Terms That Have Been Changed CCSDS 232.1-B-2 Page C-1 September 2010 RECOMMENDED STANDARD FOR COMMUNICATIONS OPERATION PROCEDURE-1 ANNEX D
CHANGES FROM REFERENCE [B2]
D1 GENERAL This Recommended Standard is developed from the specification in reference [B2], but a few
technical details in reference [B2] have been changed based on experiences in using this
procedure. These technical changes are described in D2. Also, some technical terms in
reference [B2] have been changed in order to unify the terminology used in all CCSDS
Recommended Standards that define space link protocols. These terminology changes are
listed in D3.
D2.1 TECHNICAL CHANGES
FARM-1 BUFFERS In 126.96.36.199 of reference [B2] it is stated that FARM-1 should have one ‘front-end’ buffer and
at least one ‘back-end’ buffer. However, the FARM-1 State Table does not use the
distinction between front-end and back-end buffers. Therefore the notion of front-end and
back-end buffers is no longer used in this Recommended Standard. It is only assumed that
FARM-1 uses some buffers for storing incoming and outgoing data and these buffers are
managed by FARM-1.
D2.2 FDU ABORTED INDICATION In 2.3.2 of referenc...
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- Spring '14
- Space Exploration, ........., European Space Agency, CCSDS