To the coding layer below c buffers of tc data bits

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Unformatted text preview: Transfer Frames, which instruct the receiving end how to accept and report the received frames. To the Coding layer below: (c) Buffers of TC data bits containing protocol data units from the TC Transfer layer (i.e., one or more TC Transfer Frames). CCSDS 202.0-B-2 Page B-7 CCSDS HISTORICAL DOCUMENT November 1992 CCSDS HISTORICAL DOCUMENT CCSDS RECOMMENDATION FOR TELECOMMAND: DATA ROUTING SERVICE (d) (3) Control instructions defining the operational procedures to be used to transmit the buffer of bits to the spacecraft. INTERNAL FUNCTIONS (a) (b) Translates control instructions received from layers above into the appropriate set of operational procedures to be used to transfer the TC Transfer Frames to the spacecraft, including selection of the correct mode (Acceptance Test or Bypass) of the Command Operation Procedure (COP). (c) Creates Control Command TC Transfer Frames for transmission to the receiving end of the layer in order to control the Frame Acceptance and Reporting Mechanism (FARM). (d) Supervises the transfer of TC Transfer Frames to the receiving end by executing a Frame Operation Procedure (FOP) in accordance with the selected mode of the COP. (e) Retransmits TC Frames as required to rectify channel-induced errors. (f) B-3.2 Encapsulates TC Frame Data Units into TC Transfer Frames. Responds to control instructions from layers above to abort command transmission by issuing the appropriate set of control instructions to the layer below. Transfer Layer: Receiving End Service Specification (1) INPUTS From the Segmentation layer above: (a) Information defining the ability of the Segmentation layer to accept more data (optional). From the sending end of the Transfer layer: (b) Control Command TC Transfer Frames which contain instructions defining how the data-carrying TC Transfer Frames are to be processed. From the Coding layer below: (c) “Clean” octets of decoded TC data. (Note: only correct data, which have passed the decoder quality check, will normally be received.) CCSDS 202.0-B-2 Page B-8 CCSDS HISTORICAL DOCUMENT November 1992 CCSDS HISTORICAL DOCUMENT CCSDS RECOMMENDATION FOR TELECOMMAND: DATA ROUTING SERVICE (d) (e)...
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