132x0b1c1

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Unformatted text preview: S 1 In order to conserve bandwidth on the space link, some parameters associated with the TM Space Data Link Protocol are handled by management rather than by inline communications protocol. The managed parameters are those which tend to be static for long periods of time, and whose change generally signifies a major reconfiguration of the protocol entities associated with a particular mission. Through the use of a management system, management conveys the required information to the protocol entities. 2 In this section, the managed parameters used by the TM Space Data Link Protocol are listed for each of the Channels and for Packet transfer. These parameters are defined in an abstract sense and are not intended to imply any particular implementation of a management system. 5.1 MANAGED PARAMETERS FOR A PHYSICAL CHANNEL Table 5-1 lists the managed parameters associated with a Physical Channel. Table 5-1: Managed Parameters for a Physical Channel Managed Parameter Allowed Values Physical Channel Name Character String Transfer Frame Length (octets) Integer Transfer Frame Version Number 1 Valid Spacecraft IDs Set of Integers MC Multiplexing Scheme Mission Specific Presence of Frame Error Control Present, Absent CCSDS 132.0-B-1 Page 5-1 September 2003 CCSDS RECOMMENDATION FOR TM SPACE DATA LINK PROTOCOL 5.2 MANAGED PARAMETERS FOR A MASTER CHANNEL Table 5-2 lists the managed parameters associated with a Master Channel. Table 5-2: Managed Parameters for a Master Channel Managed Parameter Allowed Values Transfer Frame Version Number 1 Spacecraft ID Integer Valid VCIDs Set of Integers (from 0 to 7) VC Multiplexing Scheme Mission Specific Presence of MC_FSH Present, Absent MC_FSH Length (if present) (octets) Integer (from 2 to 64) Presence of MC_OCF Present, Absent 5.3 MANAGED PARAMETERS FOR A VIRTUAL CHANNEL Table 5-3 lists the managed parameters associated with a Virtual Channel. Table 5-3: Managed Parameters for a Virtual Channel Managed Parameter Allowed Values Transfer Frame Version Number 1 Spacecraft ID Integer VCID 0, 1, …, 7 Data Field Content Packets, VCA_SDU Presence of VC_FSH Present, Absent VC_FSH Lengt...
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This document was uploaded on 03/06/2014.

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