Note trailing octets of fill data could be present

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Unformatted text preview: “Data Stop” signal (indication of the last valid octet of TC data). (Note: trailing octets of Fill Data could be present just before the Data Stop signal is received.) (f) (2) “Data Start” signal (indication of the start of the first valid octet of TC data). Control information describing the status of the physical channel (e.g., rf and bit synchronization). OUTPUTS To the Segmentation layer above: (a) TC Frame Data Units which have been extracted from TC Transfer Frames that passed the validation and, optionally, the acceptance tests. To the sending end of the Transfer layer: (b) CLCWs which will be utilized by the FOP to control the transmission of additional TC Transfer Frames, or the retransmission of previously sent frames, in accordance with the rules of the COP. To the Coding layer below: None. (3) INTERNAL FUNCTIONS (a) Responds to Control Command TC Transfer Frames received from the sending end of the layer. (b) Performs the Frame Validation Check Procedure for all TC Transfer Frames and the frame acceptance checks of the Frame Acceptance and Reporting Mechanism for Type-A Frames. (c) Creates reports (CLCWs) to the sending end describing the status of TC Transfer Frame acceptance. (d) Processes TC Transfer Frames which have been retransmitted as required to rectify channel-induced errors. (e) Extracts TC Frame Data Units. (f) Passes the extracted TC Frame Data Units to the Segmentation layer. CCSDS 202.0-B-2 Page B-9 CCSDS HISTORICAL DOCUMENT November 1992 CCSDS HISTORICAL DOCUMENT CCSDS RECOMMENDATION FOR TELECOMMAND: DATA ROUTING SERVICE (g) Responds to control instructions from layers below to abort command transmission by ceasing the processing of the current TC Transfer Frame, and awaiting new control instructions. CCSDS 202.0-B-2 Page B-10 CCSDS HISTORICAL DOCUMENT November 1992...
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