As no error recovery is performed by cop 1 for a type

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Unformatted text preview: Transfer FDU’ or a ‘Reject Response to Request to Transfer FDU’ referring to the Request. With this transfer notification signal, FOP-1 signals its acceptance or rejection of the Request. As long as the sending-end Lower Procedures are capable of accepting the Type-BD Transfer Frame, it shall be accepted from the Higher Procedures and transmitted. If the Lower Procedures cannot accept the Type-BD Transfer Frame, it shall be rejected; there is no Wait_Queue for Type-BD Transfer Frames. As no error recovery is performed by COP-1 for a Type-BD Transfer Frame, a copy of the data is not kept by FOP-1 and no confirmation of acceptance of the Transfer Frame by the receiving end is signaled. Once an ‘Accept Response to Request to Transfer FDU’ or a ‘Reject Response to Request to Transfer FDU’ is returned, no further action is taken by FOP-1 for the corresponding Request. CCSDS 232.1-B-2 Page 4-9 September 2010 RECOMMENDED STANDARD FOR COMMUNICATIONS OPERATION PROCEDURE-1 5 FOP-1 5.1 FOP-1 VARIABLES 5.1.1 GENERAL This section describes the variables used by the FOP-1 state machine. The complete meaning of these variables can only be fully understood in conjunction with a careful reading of the FOP-1 State Tables contained in section 5.3. It is these tables and the associated actions defined in 5.2 which, ultimately, contain the master definition of FOP-1. The variables defined in this section are part of the definition of FOP-1. Any implementation of FOP-1 is likely to have additional private, implementation-dependent variables. FOP-1 maintains the following variables for each Virtual Channel: a) State; b) Transmitter_Frame_Sequence_Number (usually referred to as ‘V(S)’); c) Wait_Queue; d) Sent_Queue; e) To_Be_Retransmitted_Flag; f) AD_Out_Flag; g) BD_Out_Flag; h) BC_Out_Flag; i) Expected_Acknowledgement_Frame_Sequence_Number (usually referred to as ‘NN(R)’); j) Timer_Initial_Value (also known as ‘T1_Initial’); k) Transmission_Limit; l) Transmission_Count; m) FOP_Sliding_Window_Width (also known as ‘K’); n) Timeout_T...
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This document was uploaded on 03/06/2014.

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