Profile • The System Monitoring and Communication (SMAC) Profile defines a subsystem intended for integration into RP, CH, and PS nodes to provide control, communication, and state-of-health (SOH) monitoring capabilities for JAS nodes. The SMAC subsystem consists of a single, common design applied to all nodes which provides a consistent interface to...
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TEP Parameters
Specification • Each TEP shall be defined with the following parameters: TEP Type Definition Local SLA The SLA assigned to the TEP for each channel. Remote SLA The SLA assigned to the TEP which is connected to the local TEP. TEP Type Identifies the TEP as transmit or receive. Window Size The...
TEP States
Specification • Each TEP shall be in one of four possible operating states: TEP State Definition CLOSED The TEP does not generate any packets on the link and does not respond to any packets received. ENABLED A TEP transitions to the ENABLED state when the host has requested it to be opened...
Thermal Impact
Specification • The JAS mechanical structure shall be designed to maintain the electronics/PCBs within given displacements while the system is in operation as applied by determining thermal impacts on the mechanical structure. The operational thermal environments of a nominal orbit need to be applied to the mechanical model as necessary to ensure...
Thermal Loads
Specification • Yield and ultimate thermal loads for hardware subject to thermal tests shall be calculated by either Alternate A or Alternate B, as defined below, whichever produces the maximum load. These thermal loads are not to be used for fatigue. Alternate A: Yield thermal load (YTL) = Predicted thermal load (PTL)...
Time Distribution
Other • The JAS architecture does not specify a time distribution scheme nor limit system implementations from incorporating their own methods. Two possible time distribution schemes are presented as examples: Fully Connected A fully connected distribution provides a direct interface between each node and the host. Fully connected time distribution is more...
Time Management Service
Specification • The time access service, service type address 131 is used to access and manage time. The currently defined platform management service parameters are shown in the following table. Service Type Service Subtype Subtype Description Cmd Tlm Service Parameters Data Types and Description 131 1 Time Set X Time Time...
Timing Control
Profile • SMAC Timing Control The SMAC includes a time-keeping circuit that is used for synchronizing time across the entire payload. The timekeeping process has two components: receipt of the time value for the next epoch, and synchronization to a timing pulse. The receipt of time value occurs over the network. The...
Trailer
Specification • JRDDP Packet Format The JRDDP packet trailer shall be a 16-bit CCITT Cyclic Redundancy Check (CRC) computed from the Destination SLA to the last byte of the Payload field. CRC The 16-bit CCITT CRC shall be computed according to the following polynomial: CRC Polynomial for JRDDP Prior to computing each...
Transmit Priority
Specification • When more than one packet is available for transmit, all ACK packets shall be transmitted first, then CONTROL packets, then URGENT packets (if implemented), then Retransmit packets (CONTROL or DATA), then DATA packets.
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