Notes 1 if a gap in the virtual channel frame count

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Unformatted text preview: gure 4-15. CCSDS 132.0-B-1 Page 4-24 September 2003 CCSDS RECOMMENDATION FOR TM SPACE DATA LINK PROTOCOL VC Reception Function VC Frame Service User VC Frames Virtual Channel Demultiplexing Function for a Master Channel VC Frames Demultiplexing MC Frames Master Channel Reception Function Figure 4-15: Abstract Model of Virtual Channel Demultiplexing Function 4.3.5 MASTER CHANNEL RECEPTION FUNCTION 4.3.5.1 The Master Channel Reception Function shall be used to extract service data units contained in the Transfer Frame Secondary Header and Operational Control Field from Transfer Frames of a Master Channel. NOTE – There is an instance of the Master Channel Reception Function for each Master Channel. 4.3.5.2 If there is a user of the MC_FSH Service for a particular Master Channel, FSH_SDUs contained in the Transfer Frame Secondary Header of the Transfer Frames shall be extracted and delivered to the user. If there is a user of the MC_OCF Service for a particular Master Channel, OCF_SDUs contained in the Operational Control Field of the Transfer Frames shall be extracted and delivered to the user. NOTES 1 If a gap in the Master Channel Frame Count is detected, a Loss Flag is optionally delivered to the users. 2 An abstract model of the Master Channel Reception Function is illustrated in figure 4-16. CCSDS 132.0-B-1 Page 4-25 September 2003 CCSDS RECOMMENDATION FOR TM SPACE DATA LINK PROTOCOL VC Demux. Function MC_FSH Service User MC Frames Master Channel Reception Function for a Master Channel MC_OCF Service User FSH_SDUs OCF_SDUs Decommutation MC Frames Master Channel Demultiplexing Function Figure 4-16: Abstract Model of Master Channel Reception Function 4.3.6 MASTER CHANNEL DEMULTIPLEXING FUNCTION 4.3.6.1 The Master Channel Demultiplexing Function shall be used to demultiplex Transfer Frames of different Master Channels of a Physical Channel. NOTE – There is an instance of the Master Channel Demultiplexing Function for each Physical Channel that has multiple Master Channels. 4.3.6.2...
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