Efficient telecommand operation can usually be

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Unformatted text preview: , and to reliably convey them without detected error from the sending to the receiving ends of the layer. Efficient telecommand operation can usually be achieved when the Channel Service (Reference [2]) rejects less than 1 frame per 103 frames transmitted. To achieve the performance required for a particular mission, an acceptable combination of Channel Service parameters (e.g., codeblock decoding method, number of contiguous TC Codeblocks, error characteristics of the physical layer) must be selected. Information on the frame rejection performance is given in Reference [2]. CCSDS 202.0-B-2 Page B-6 CCSDS HISTORICAL DOCUMENT November 1992 CCSDS HISTORICAL DOCUMENT CCSDS RECOMMENDATION FOR TELECOMMAND: DATA ROUTING SERVICE Project operations are compromised by undetected frame errors. The selected Channel Service parameters not only control the frame rejection rate but also dictate the inherent undetected frame error rate. If the undetected frame error rate provided by the Channel Service is inadequate for a project’s needs, the Cyclic Redundancy Check described in sec should be applied to the transfer frame to bring this error rate into conformance. Information on undetected frame error performance is given in Reference [2]. B-3.1 Transfer Layer: Sending End Service Specification (1) INPUTS From the Segmentation layer above: (a) TC Frame Data Units. (b) Control instructions, Management Directives and Data Transfer Requests for the FOP. (See Reference [7] for details.) From the receiving end of the Transfer layer: (c) Information concerning the status of receipt of individual TC Frames, formatted into a Command Link Control Word (CLCW) and extracted from the Telemetry Transfer Frame (Reference [5]) or the Virtual Channel Data Unit (Reference [8]). From the Coding layer below: (d) (2) Status of the physical channel. OUTPUTS To the Segmentation layer above: (a) Status of the data routing process, including the progress of delivering individual TC Frame Data Units and the availability of Virtual Channels. To the receiving end of the Transfer layer: (b) “Control Command” TC...
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This document was uploaded on 03/06/2014.

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