The request identifier shall be used in the

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Unformatted text preview: are parameters of the signal): Request to Transfer FDU (Request Identifier, GVCID, FDU, Service Type). The Request Identifier shall be used in the subsequent notification signal to identify the request associated with it. 3.2.2.3.3 Transfer Notifications The transfer notification signal shall be issued by FOP-1 to notify the Higher Procedures of an event associated with the transfer of an FDU. The transfer notification signals shall be processed by the Higher Procedures to generate a service indication primitive to notify the user of an event associated with the transfer of a service data unit. NOTE – The transfer notification signal is issued by FOP-1 for an FDU, while the service indication primitive is issued by the Higher Procedures for a service data unit. One transfer notification signal may not result in one service indication primitive, because segmentation or blocking may have been performed by the Higher Procedures (see reference [3]). The transfer notification signal shall have the following format (the items in parentheses are parameters of the signal): Transfer Notification (Request Identifier, GVCID, Notification Type). For Notification Type, see 4.4. 3.2.3 FOP-1 INTERFACE TO LOWER PROCEDURES The following signals shall be delivered by FOP-1 to the Lower Procedures (the items in parentheses are parameters of the signal): a) Transmit Request for Frame (GVCID, Bypass Flag, Control Command Flag, Frame Sequence Number, Transfer Frame Data Field); b) Abort Request (GVCID). The ‘Transmit Request for Frame’ signal shall be used to request the Lower Procedures to transmit a Transfer Frame. The parameters of this signal are elements of a Transfer Frame (for details, see reference [3]). CCSDS 232.1-B-2 Page 3-5 September 2010 RECOMMENDED STANDARD FOR COMMUNICATIONS OPERATION PROCEDURE-1 The ‘Abort Request’ signal shall be used to cancel any ongoing processes for Type-AD and BC Transfer Frames of the Virtual Channel (identified by the GVCID parameter) that are being performed in the Lower Procedures. NOTE – The ‘Abort Request’ signal is used to facilitate efficient retransmission of TypeAD or BC Transfer Frames, and may (optional...
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This document was uploaded on 03/06/2014.

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