Profile • All JAS nodes communicate through a standard set of interfaces that adhere to standard protocols. Refer to the Electrical Specification for physical layer technical information and Communication Specification for details on standard data protocols. This section describes megabit-class interfaces, with line speeds below one gigabit per second ( The protocols...
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Network Interfaces
Profile • All JAS nodes communicate through a standard set of interfaces that adhere to standard protocols. Refer to the Electrical Specification for physical layer technical information and Communication Specification for details on standard data protocols. This section describes two classes of network interfaces, megabit interfaces with line speeds below one gigabit...
Network Interfaces
Profile • All JAS nodes communicate through a standard set of interfaces that adhere to standard protocols. Refer to the Electrical Specification for physical layer technical information and Communication Specification for details on standard data protocols. This section describes two classes of network interfaces, megabit interfaces with line speeds below one gigabit...
Network Router
Profile • SMAC Network Router The network interface implemented by the SMAC is typically SpaceWire, though other protocols may be implemented. It is highly recommended to implement a network router (rather than just endpoints) in order to provide redundancy in the network and better choices of network topologies. Configurable routers also permit...
Network Topologies
Other • The selection of network topology is a critical component when developing multi-node or multi-point system architectures. A good choice of topology will require less power, have less complexity, higher reliability, and will orchestrate network traffic smoothly and quickly between nodes. Conversely, a poor choice of topology will introduce complex and...
Networks
Profile • Each JAS node should contain a SpaceWire Router per the SMAC Profile which allows for extensive scaling of the network. A network is made up of a number of links, nodes (endpoints) and routing switches. Links provide the means for passing packets from one node to another. Nodes can be...
Node Personality
Profile • SMAC Personality NV Memory A NV memory should be connected to the SMAC. The NV memory is used for two purposes: storing initial SMAC configuration information, and storing personality information about the node. The stored SMAC configuration typically consists of default routing tables for the network router, processing element power...
Nominal Case
Specification • In the nominal case the close packet is immediately acknowledged by the receive TEP and the transmit TEP transitions to the CLOSED state. The receive TEP transitions to the CLOSED state after the expiration of its timer. The purpose of the receive TEP’s delay in the CLOSING state is to...
Non-Volatile Memory Storage
Profile • Another common application of this profile is as an interface to non-volatile memories. These memories may contain firmware for FPGA nodes, mission data queued for transmission to the ground, payload configuration parameters, software, and more. Non-Volatile Memory Storage Instantiation In these applications, the CH node software is configured with services...
Obscuration
Specification • All JAS mechanical structure components shall be placed to prevent obscuration of the system view of space if the JAS electronics box will be used to radiate. Structural elements shall be kept an appropriate distance away from the JAS electronics housings.
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