This Recommended Standard defines the Forward Space Packet (FSP) service in conformance with the transfer services specified in reference [1],Cross Support Reference Model--Part 1: SLE Services. The FSP service is a Space Link Extension (SLE) transfer service that enables a mission to send Space Packets to a spacecraft in sequence-controlled or expedited mode.Cross References:CCSDS 910.4-B-2:2005ISO 15396:2007CCSDS 301.0-B-3:2002ISO 11104:2003CCSDS 231.0-B-1:2003ISO 22642:2005CCSDS 232.0-B-1:2003ISO 22664:2005CCSDS 232.1-B-1:2003ISO 22667:2005CCSDS 133.0-B-1:2003ISO 22646:2005ISO/IEC 8824-1:2008ISO/IEC 7498-1:1994CCSDS 912.1-B-3:2010ISO 22671:2011CCSDS A00.0-Y-9:2003CCSDS 200. 0-G-6:1987CCSDS 910.3-G-3:2006CCSDS 201.0-B-3:2000ISO 12171:2002CCSDS 202.0-B-3:2001ISO 12172:2003CCSDS 202.1-B-2:2001ISO 12173:2003CCSDS 203.0-B-2:2001ISO 12174:2003CCSDS 913.All current amendments available at time of purchase are included with the purchase of this document.