Unformatted text preview: 5 Figure 6-2: FARM-1 State Transitions CCSDS 232.1-B-2 Page 6-11 September 2010 RECOMMENDED STANDARD FOR COMMUNICATIONS OPERATION PROCEDURE-1 7 MANAGED PARAMETERS 7.1 OVERVIEW OF MANAGED PARAMETERS In order to conserve bandwidth on the space link, some parameters associated with the
Communications Operation Procedure-1 are handled by management rather than by an 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.
In this section, the managed parameters used by the Communications Operation Procedure-1
are listed. These parameters are defined in an abstract sense and are not intended to imply
any particular implementation of a management system.
7.2 FOP-1 MANAGED PARAMETERS Table 7-1 lists the managed parameters used by FOP-1 for a Virtual Channel.
Table 7-1: FOP-1 Managed Parameters
Managed Parameter Allowed Values T1_Initial Integer Transmission_Limit Integer FOP_Sliding_Window_Width 1, 2, …or 255 Timeout_Type 0 or 1 7.3 FARM-1 MANAGED PARAMETERS Table 7-2 lists the managed parameters used by FARM-1 for a Virtual Channel. CCSDS 232.1-B-2 Page 7-1 September 2010 RECOMMENDED STANDARD FOR COMMUNICATIONS OPERATION PROCEDURE-1 Table 7-2: FARM-1 Managed Parameters
Managed Parameter Allowed Values FARM_Sliding_Window_Width (W) 2, 3, … or 254 FARM_Positive_Window_Width (PW) (Must be equal to W/2) FARM_Negative_Window_Width (NW) (Must be equal to W/2) CLCW reporting period (seconds) Real number CCSDS 232.1-B-2 Page 7-2 September 2010 RECOMMENDED STANDARD FOR COMMUNICATIONS OPERATION PROCEDURE-1 ANNEX A
AD Acceptance Check (Bypass Flag = 0) and Data (Control Command Flag = 0) BC Bypass of Acceptance Check (Bypass Flag = 1) and Control (Control
Command Flag = 1) BD Bypass of Acceptance Check (Bypass Flag = 1) and Data (Control Command
Flag = 0) CLCW Communications Link Control Word COP Communications Operation Procedure FARM Frame Acceptance and Reporting Mechanism FDU Frame Data Unit FOP Frame Operation Procedure GVCID Global Virtual Channel Identifier K FOP_Sliding_Window_Width LLIF Low...
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