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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

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

Characteristics

Other • The table below describes the characteristics of JAS. Characteristic Definition Modularity Modular, scalable design capable of accommodating a wide range of applications, complexities and performance needs Configurable Topology Flexible, node-based, topologically configurable architecture that can be easily sized, configured and optimized to meet connectivity and robustness needs of a broad...

Joint Architecture Standard Overview > JAS Rationale and Motivation > Characteristics

Coincidence Distribution

Other • The figure below illustrates how the JAS supports intra-payload coincidence and triggering. There are two options: Serial Packets JAS nodes can transmit packetized signals via the communications architecture if latency requirements are not too stringent. Discrete Signals Discrete coincidence and trigger signals can be added to any node through the...

Joint Architecture Standard Overview > Coincidence Distribution

Command and Host Processor Profile

Other • The Command and Host Processor (CH) profile defines a microprocessor-based solution suitable to construct nodes for mission data processing, spacecraft interfaces, and other applications requiring software execution on microprocessor platforms. Nodes based on the CH profile work alongside other nodes within the JAS architecture. The SMAC Profile and the Communication...

Joint Architecture Standard Overview > JAS Profile Introductions > Command and Host Processor Profile

Communications Profile

Other • The Communications Profile defines standard interfaces for facilitating communication between nodes within a JAS system. The Communications Profile focuses primarily on communication between payload applications. It leverages industry standards to support network-based communication using serial interfaces. Adherence to the Communications Profile and Communications Specification is the minimum required for a...

Joint Architecture Standard Overview > JAS Profile Introductions > Communications Profile

Complete and Incomplete Hypercubes

Other • An overall good performer, hypercubes are very reliable and offer good performance. Complete hypercubes have fixed size of 2^d (i.e., 4, 8, 16, 32, 64, etc, nodes) but an extension to this structure (incomplete hypercubes) allows for arbitrary size. Hypercubes are constructed by beginning with two interconnected nodes (a 1-D...

Joint Architecture Standard Overview > Network Topologies > Complete and Incomplete Hypercubes

Cube Connected Cycles

Other • Cube-connected cycles (CCC) are structures based on hypercubes (see Figure). Given a hypercube of dimension d, each hypercube node is replaced with a ring of size d. This causes the node degree of all nodes to be fixed at 3 regardless of network size! This structure excels when the port...

Joint Architecture Standard Overview > Network Topologies > Cube Connected Cycles

Entangled Networks

Other • Entangled networks are a class of networks that attempt to maximize the algebraic connectivity of the topology. These networks can be constructed with explicit complex mathematical methods or approximated by a repetitive random optimization algorithm (which is the method chosen for this analysis) (see Figure). Sample Entangled Networks The repetitive...

Joint Architecture Standard Overview > Network Topologies > Entangled Networks

Expansion Profile

Other • The Expansion Profile describes a board that provides new capabilities and/or additional resources that would otherwise not be available in standard node instantiations. These modules are not intended to operate standalone and will usually not have individual processing capabilities. Rather, these boards will be populated with components that allow for...

Joint Architecture Standard Overview > JAS Profile Introductions > Expansion Profile

Fully Connected

Other • Fully connected networks are constructed by wiring every node to every other node present in the network (see Figure). For obvious reasons, these networks are the ideal topology when considering overall speed, diameter, routing complexities, reliability, and ease of construction. However, they require a massive number of links; hence, cost...

Joint Architecture Standard Overview > Network Topologies > Fully Connected