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B31 physical layer sending end service specification

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Unformatted text preview: SERVICE SPECIFICATION (1) INPUTS From the layer above: (a) (b) (2) Buffers of bits corresponding to a CLTU. Control information. OUTPUTS To the layer above: (a) Status of the physical telecommand channel. To the receiving end of the layer: (b) Modulated radio frequency waveforms, radiated as Reference [3]. CCSDS 201.0-B-3 Page B-7 described in June 2000 CCSDS RECOMMENDATION FOR TELECOMMAND: CHANNEL SERVICE (3) INTERNAL FUNCTIONS (a) (b) B3.2 Establishes the physical radio frequency path to the spacecraft using CMM-1. Radiates a buffer of data bits serially according to the PLOP requested by the layer above. PHYSICAL LAYER: RECEIVING END SERVICE SPECIFICATION (1) INPUTS From the sending end of the layer: (a) (2) Modulated radio frequency waveforms which have been radiated by a transmitting station as described and specified in Reference [3]. OUTPUTS To the layer above: (a) (b) Symbol clock (if required). (c) Channel Active (modulated carrier/subcarrier present); used by layer above to select between Inactive and Search states, to validate the Decode state and in some cases to initiate inter-layer control instructions. (d) (3) Synchronized detected “dirty” symbol stream. S...
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