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2 D Meshes and 2 D Toroids

Other • 2-D meshes are one of the easiest topologies to visualize – nodes are connected in a “grid” fashion (see Figure). The simple layout also allows many problems to map easily to the structure of this network. 2-D Mesh and 2-D Toroid 2-D meshes have unequal node degree. The node degree...

Joint Architecture Standard Overview > Network Topologies > 2 D Meshes and 2 D Toroids

3 D Meshes and 3 D Toroids

Other • 3-D meshes and 3-D toroids are similar to 2-D meshes and toroids, except the 3-D mesh/toroid is expanded along the Z-axis to provide another dimensional layer of nodes. In the case of the 3-D toroid, the topmost nodes (along the new Z-axis) are connected to the bottommost nodes (see Figure)....

Joint Architecture Standard Overview > Network Topologies > 3 D Meshes and 3 D Toroids

Acronyms

Other • Acronym Definition A/D Analog-to-Digital (as in A/D converter) ACK Acknowledge ADC Analog-to-Digital Converter API Application Program Interface APID Application Identifier APP Application CCC Cube-Connected Cycles CCITT From French: Comité Consultatif International Téléphonique et Télégraphique International Telegraph and Telephone Consultative Committee CC-NUMA Cache Coherent-Non-Uniform Memory Access CCSDS Consultative Committee for Space...

Joint Architecture Standard Overview > Acronyms

Addressing

Profile • SpaceWire supports three types of addressing: Path (Physical) Addressing, Logical Addressing, and Regional Addressing. JAS uses regional addressing because it provides the greatest flexibility to create scalable networks. Regional addressing uses a two-byte scheme where the first byte identifies the router and the second byte identifies the endpoint address connected...

Communication Profile > Interconnect Technologies > SpaceWire Interconnect > SpaceWire Transport > Addressing

Advantages of JAS

Other • A modern node-based architecture with reconfigurable node electronics and serial data links between nodes provides the core structure and flexibility needed to enable most of the design strategies. It offers a powerful, yet efficient, modular solution that can be scaled and configured to support payloads of virtually any size and...

Joint Architecture Standard Overview > JAS Rationale and Motivation > Advantages of JAS

Allocation of Service Types and Subtypes

Specification • The PUS provides a standard set of services that are targeted for communication between spacecraft and ground systems. Many of them may not be applicable to on-board communication between applications. However, nothing precludes their use in a JAS-based system. The PUS can be extended to add additional functionality to existing...

Communication Specification > JAS Packets > Packet Service Definitions > Allocation of Service Types and Subtypes

Analog Electronics

Profile • This instantiation of the Expansion Profile implements a 6U VPX board to include analog electronics and connectors to access incoming signals from external sensor modules. The analog electronics are connected to an RP node through the system backplane. The FPGA on the RP node filters and processes the incoming data...

Expansion Profile > Applications > Analog Electronics

Applications

Profile • Common instantiations of the CH profile include, but are not limited to: Host Vehicle Interface and Configuration Manager Mission Data Processing Non-Volatile Memory Storage Mass Memory Node The CH node can operate in several capacities, the most essential of which is the Host Vehicle Interface and Configuration Manager. However, several...

Command and Host Processor Profile > Applications

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