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Unformatted text preview: TROL test must pass. (6) 4.3.3 The TC Frame must have an expected VERSION NUMBER. The Data Field of a TC Frame containing a Control Command must be consistent
with the allowed Control Commands. COMMAND OPERATION PROCEDURE (COP) The Command Operation Procedure fully specifies the closed-loop protocols executed by the
sending and receiving ends of the Transfer layer of the TC System. The COP, which exists
wholly within the Transfer layer, consists of a pair of synchronized procedures for each
Virtual Channel: a Frame Operation Procedure (FOP) that executes within the sending
entity; and a Frame Acceptance and Reporting Mechanism (FARM) that executes within the
receiving entity. The sending FOP transmits TC Frames to the receiving FARM. The
FARM returns telemetered Command Link Control Words (CLCWs) to the FOP and thus
closes the loop by providing reports of the status of frame acceptance.
The COP provides a basic Quality Of Service (QOS) within the Transfer layer that is central
to the operation of the TC System, i.e., the delivery of data units to the receiving end of the
layer above, correct and without omission or duplication, and in the same sequential order in
which they were received from the layer above at the sending end.
Only one COP is defined in this Recommendation: COP-1.
THE CONTROLLING SPECIFICATIONS FOR THE LOGICAL OPERATIONS
WHICH MUST BE EXECUTED TO PERFORM THE COP ARE CONTAINED IN A
MORE DETAILED CCSDS RECOMMENDATION (REFERENCE ). IN THE
EVENT OF ANY CONFLICT BETWEEN THE DESCRIPTIVE TEXT CONTAINED
IN THIS RECOMMENDATION AND THE TEXT OF REFERENCE , THE MORE
DETAILED SPECIFICATIONS CONTAINED IN REFERENCE  SHALL
PREVAIL. CCSDS 202.0-B-2 Page 4-16 CCSDS HISTORICAL DOCUMENT
November 1992 CCSDS HISTORICAL DOCUMENT
CCSDS RECOMMENDATION FOR TELECOMMAND: DATA ROUTING SERVICE Underlying the Transfer layer is the physical telecommand data channel which interconnects
its sending and receiving ends. If a perfect data channel existed, the QOS would be assured
since the exact duplicate of the series of data uni...
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This document was uploaded on 03/06/2014.
- Spring '14