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27 all frames generation function 4271 the all frames

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Unformatted text preview: Physical Channel. If the Frame Error Control Field is present, check bits shall be generated using the encoding procedure described in and inserted into the Transfer Frame Trailer. NOTE – If this field is present, it must be present in all the Transfer Frames transmitted in a particular Physical Channel. An abstract model of the All Frames Generation Function is illustrated in figure 4-11. CCSDS 132.0-B-1 Page 4-20 September 2003 CCSDS RECOMMENDATION FOR TM SPACE DATA LINK PROTOCOL MC Multiplexing Function All Frames All Frames Generation Function for a Physical Channel Error Control Encoding All Frames Coding Sublayer Figure 4-11: Abstract Model of All Frames Generation Function 4.3 PROTOCOL PROCEDURES AT THE RECEIVING END 4.3.1 OVERVIEW This subsection describes procedures at the receiving end associated with each of the functions shown in figure 4-12. Data flow from the bottom to top of the figure. This figure identifies data-handling functions performed by the protocol entity at the receiving end, and shows logical relationships among these functions. This figure is not intended to imply any hardware or software configuration in a real system. Depending on the services actually used for a real system, not all of the functions may be present in the protocol entity. The procedures described in this subsection are defined in an abstract sense and are not intended to imply any particular implementation approach of a protocol entity. CCSDS 132.0-B-1 Page 4-21 September 2003 CCSDS RECOMMENDATION FOR TM SPACE DATA LINK PROTOCOL Packet Serv ice VC Acces s Serv ice VC _FS H Serv ice VC _O C F Serv ice VC Frame Serv ice Packet MC _FS H Ex traction Serv ice MC _O C F Virtual C hannel Recep tion Serv ice MC Frame Virtual C hannel Demultip lex ing Serv ice Mas ter C hannel Recep tion Mas ter C hannel Demultip lex ing All Frames Recep tion Figure 4-12: Internal Organization of Protocol Entity (Receiving End) 4.3.2 PACKET EXTRACTION FUNCTION The Packet Extraction Function shall be used to extract variable-length Packets from the fixed-length Data Field of Transfer Frames. NOTE – There is an instance of the Packet Extraction Function for each Virtu...
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