4243 the algorithm used to order the transfer frames

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Unformatted text preview: . 4.2.4.4 If there is only one Master Channel on the Physical Channel, the Virtual Channel Multiplexing Function shall create an OID Transfer Frame to preserve the continuity of the transmitted stream in the event that there are no valid Transfer Frames available for transmission at a release time. The OID Transfer Frame shall have its First Header Pointer set to ‘11111111110’ and its VCID set to that of a Virtual Channel that carries Packets but does not support the VC_FSH or VC_OCF Service. 4.2.4.5 An abstract model of the Virtual Channel Multiplexing Function is illustrated in figure 4-8. VC Generation Function VC Frame Service User VC Frames Virtual Channel Multiplexing Function for a Master Channel VC Frames Idle Frame Multiplexing MC Frames Master Channel Generation Function Figure 4-8: Abstract Model of Virtual Channel Multiplexing Function 4.2.5 MASTER CHANNEL GENERATION FUNCTION 4.2.5.1 The Master Channel Generation Function shall be used to insert Transfer Frame Secondary Header and/or Operational Control Field service data units into Transfer Frames of a Master Channel. NOTE – There is an instance of the Master Channel Generation Function for each Master Channel. 4.2.5.2 If there is a user of the MC_FSH Service for a particular Master Channel, an FSH_SDU supplied by the user shall be placed in the Transfer Frame Secondary Header. CCSDS 132.0-B-1 Page 4-18 September 2003 CCSDS RECOMMENDATION FOR TM SPACE DATA LINK PROTOCOL 4.2.5.3 If there is a user of the MC_OCF Service for a particular Master Channel, an OCF_SDU supplied by the user shall be placed in the Operational Control Field of a Transfer Frame. NOTE – A Master Channel Frame Count is generated independently for each Master Channel and placed into the Primary Header. 4.2.5.4 An abstract model of the Master Channel Generation Function is illustrated in figure 4-9. VC Mux. Function MC_FSH Service User MC Frames Master Channel Generation Function for a Master Channel MC_OCF Service User FSH_SDU...
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This document was uploaded on 03/06/2014.

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