If so the flag is set to notready and a copy of the

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Unformatted text preview: processing can be performed for retransmitting the Type-BC Transfer Frame until a ‘BC_Accept’ Response is received from the Lower Procedures for the outstanding ‘Transmit Request for (BC) Frame’, setting the BC_Out_Flag to ‘Ready’. b) if the BC_Out_Flag is set to ‘Ready’, checking if the Type-BC Transfer Frame on the Sent_Queue is flagged ‘To_Be_Retransmitted’. If so, the flag is set to ‘Not_Ready’ and a copy of the BC Transfer Frame is passed to the Lower Procedures as a parameter of a ‘Transmit Request for (BC) Frame’. 5.2.10 ‘LOOK FOR FDU’ This action includes: a) Checking if the AD_Out_Flag is set to ‘Ready’. If not, no further processing can be performed for transmitting Type-AD Transfer Frames. (When an ‘AD_Accept’ Response is received from the Lower Procedures for the outstanding ‘Transmit Request for (AD) Frame’, FOP-1 will set the AD_Out_Flag to ‘Ready’ and execute a new ‘Look for FDU’.) b) If the AD_Out_Flag is set to ‘Ready’, checking if a Type-AD Transfer Frame on the Sent_Queue is flagged ‘To_Be_Retransmitted’. If so, the flag is set to ‘Not_Ready’ and a copy of the first such AD Transfer Frame is passed to the Lower Procedures as a parameter of a ‘Transmit Request for (AD) Frame’ and the To_Be_Retransmitted_Flag for that Transfer Frame is reset. c) If no Type-AD Transfer Frame is marked ‘To_Be_Retransmitted’, checking if both V(S) < NN(R) + K and a Type-AD FDU is available on the Wait_Queue. If so, the FDU is removed from the Wait_Queue, an ‘Accept Response to Request to Transfer FDU’ is passed to the Higher Layer, and the ‘Transmit Type-AD Frame’ action for the FDU is performed. d) If no FDU is available on the Wait_Queue, no further processing is performed. CCSDS 232.1-B-2 Page 5-12 September 2010 RECOMMENDED STANDARD FOR COMMUNICATIONS OPERATION PROCEDURE-1 5.2.11 ‘ACCEPT’ This action includes: generating either an ‘Accept Response to Request to Transfer FDU’ o...
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This document was uploaded on 03/06/2014.

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