Unformatted text preview: s OCF_SDUs Commutation and Generation of Master Channel
Frame Count MC Frames
Master Channel Multiplexing Function Figure 4-9: Abstract Model of Master Channel Generation Function
4.2.6 MASTER CHANNEL MULTIPLEXING FUNCTION 220.127.116.11 The Master Channel Multiplexing Function shall be used to multiplex Transfer
Frames of different Master Channels of a Physical Channel.
NOTE – There is an instance of the Master Channel Multiplexing Function for each
Physical Channel that has multiple Master Channels.
18.104.22.168 The Master Channel Multiplexing Function shall multiplex Transfer Frames
received from the instances of the Master Channel Generation Function and, if present, the
Master Channel Frame Service users, and shall put them into a queue of Transfer Frames in
an appropriate order that is set by management.
22.214.171.124 The algorithm to be used to order the Transfer Frames is not specified by CCSDS
but shall defined by project organizations considering factors such as priority, release rate,
isochronous timing requirements, etc. CCSDS 132.0-B-1 Page 4-19 September 2003 CCSDS RECOMMENDATION FOR TM SPACE DATA LINK PROTOCOL 126.96.36.199 The Master 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.
NOTE – The OID Transfer Frame has its First Header Pointer set to ‘11111111110’, and
its MCID and VCID set to those of a Virtual Channel that carries Packets but
does not have the Transfer Frame Secondary Header or the Operational Control
188.8.131.52 An abstract model of the Master Channel Multiplexing Function is illustrated in
Function MC Frame
Service User MC Frames Master
Channel MC Frames Idle Frame Multiplexing All Frames
All Frames Generation Function Figure 4-10: Abstract Model of Master Channel Multiplexing Function
4.2.7 ALL FRAMES GENERATION FUNCTION
184.108.40.206 The All Frames Generation Function shall be used to perform error control
encoding defined by this Recommendation.
NOTE – There is an instance of the All Frames Generation Function for each...
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