2238 master channel operational control field mcocf

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Unformatted text preview: plexed together within one Master Channel. 2.2.3.8 Master Channel Operational Control Field (MC_OCF) Service The Master Channel Operational Control Field (MC_OCF) Service provides synchronous transfer of fixed-length data units, each consisting of four octets, in the Operational Control Field (OCF) of Transfer Frames of a Master Channel. The service is unidirectional and sequence-preserving. The transfer is synchronized with the release of Transfer Frames of a Master Channel. The service does not guarantee completeness, but may signal gaps in the sequence of service data units delivered to a receiving user. Only one user can use this service on a Master Channel, and the user is identified with the MCID of the Master Channel. Service data units from different users are not multiplexed together within one Master Channel. 2.2.3.9 Master Channel Frame (MCF) Service The Master Channel Frame (MCF) Service provides transfer of a sequence of fixed-length TM Transfer Frames of a Master Channel, created by an independent protocol entity, across a space link. The service is unidirectional, either asynchronous or periodic, and sequencepreserving. The service does not guarantee completeness, but it may signal gaps in the sequence of service data units delivered to a receiving user. CCSDS 132.0-B-1 Page 2-9 September 2003 CCSDS RECOMMENDATION FOR TM SPACE DATA LINK PROTOCOL Only one user can use this service on a Master Channel, and the user is identified with the MCID of the Master Channel. Service data units from different users are not multiplexed together within one Master Channel. The Master Channel Frame Service transfers the independently created TM Transfer Frames through the space link, together with TM Transfer Frames created by the service provider itself. This service is made available to trusted users who are certified during the design process to ensure that the independently created protocol data units do not violate the operational integrity of the space link. Necessarily, the independent Transfer Frames must have the same length as those g...
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