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Electrical Bonding

Specification • Each equipment design shall provide electrical continuity across mechanical interfaces in accordance with the design requirements of this specification. Electrical continuity will be achieved to the maximum practical extent by direct metal-to-metal contact across the entire interface surface. If the electrical resistance across mechanical interfaces is measured to be less...

Mechanical Specification > Environmental Exposure > Electromagnetic Compatibility > Electrical Bonding

Electrical Interconnects

Specification • JAS electrical design shall utilize commercial interconnect standards when applicable. The following sections are some examples of commercial interconnect standards that are recommended but not required.

Electrical Specification > Electrical Interconnects

Electrical Specification

Specification • The Electrical Specification provides details about power distribution, electrical interconnects, and communication data links that are used within a JAS-based system. The figure below provides context of where the Electrical Specification resides in the JAS standard. JAS Standard Hierarchy

Electrical Specification

Electromagnetic Compatibility

Specification • Electromagnetic Interference (EMI) and Electromagnetic Compatibility (EMC) are important design considerations which can be mitigated by the mechanical structure. EMI limits may be in place due to application-specific requirements, but more importantly, EMI can be detrimental to electronics because of the sensitive nature of many of the modern systems and...

Mechanical Specification > Environmental Exposure > Electromagnetic Compatibility

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

Environmental Exposure

Specification • Unless otherwise specified, the JAS mechanical structure shall meet these specifications during or after exposure to all environmental conditions specified in the Environmental specification. All of the intended application’s performance parameters must be considered to determine if the mechanical design can withstand the impacts of all environments.

Mechanical Specification > Environmental Exposure

Environmental Specification

Specification • The Environmental Specification provides details about environmental design considerations that should be considered for space applications of JAS. The figure below provides context of where the Environmental Specification resides in the JAS standard. JAS Standard Hierarchy

Environmental Specification

Environmental Test Flow

Specification • Programs using JAS should practice testing per industry standards wherever possible. The following tests and operational environments shall be applied to the components or structure in the following order. Events 1 through 5 shall be used for qualification acceptance testing. Events 1-6 shall be considered for fatigue calculations. 1) 24ea,...

Environmental Specification > Environmental Test Flow

Ethernet

Specification • Ethernet comprises a family of networking technologies with numerous media types and standards; 100Base-T (IEEE 802.3-2008:section 8) and 1000Base-T (IEEE 802.3-2008:section 40) the most popular in use today.

Electrical Specification > Communication Data Links > Ethernet

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

Expansion Profile

Profile • 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...

Expansion Profile

Exposure to Space Environment

Specification • This section is a system level consideration and is included for information purposes only. The view to space shall be considered for both thermal and radiation effects. Thermal-related issue: heat-dissipation Radiation-related: TID (lifetime), SEE, shielding and impact on mass

Mechanical Specification > Environmental Exposure > Exposure to Space Environment

Extended Capabilities

Profile • CH Node Extended Capabilities Customization and extension of CH node capabilities can be realized through instantiations of the Expansion Profile. In instances where custom electronics are needed (for example, spacecraft interfaces or attachments to expansion memory), mezzanines or custom backplane routing to other boards connect electronics to the CH node...

Command and Host Processor Profile > Functional Description > Extended Capabilities

Extended Capabilities

Profile • RP Node Extended Capabilities The flexibility provided by FPGAs allows nodes built upon the RP profile to accommodate custom connectivity to other components, devices, or even other nodes. Customization and extension of RP node capabilities can be realized through instantiations of the Expansion Profile. In instances where custom electronics are...

Reconfigurable Processing Profile > Functional Description > Extended Capabilities

External Interfaces

Profile • Depending on the nature of the expansion module and its integrated components, electronics modules built to the Expansion Profile will have varying needs with regard to communications interfaces. The Communication Specification is the authoritative document when the expansion module requires network connectivity. Discrete signals may be brought directly in to...

Expansion Profile > External Interfaces

Factors of Safety

Specification • The JAS mechanical structure shall have strength margins of safety greater than zero when calculated from analytically derived structural loads. The factors of safety (FS), shown in the first table below, and test load factors, shown in the second table below, shall be applied to the limit loads. All laminated...

Mechanical Specification > Design Constraints > Structural Integrity > Factors of Safety

Fatigue

Specification • The JAS mechanical structure metallic elements shall be designed to withstand the effects of cyclic load condition caused by the design environment. The design environment includes all ground handling transportation, testing, launch and on orbit operational environments indicated in the Environmental Specification. MSFC-HDBK-505 Chapter 7 shall be implemented for fatigue...

Mechanical Specification > Design Constraints > Structural Integrity > Fatigue

Form Factor

Specification • While no specific form factor standard is specified in JAS it is highly recommended that programs make use of a standards-based mechanical design such as VPX defined by VITA. Although VPX is preferred, other standards may be considered for use as well. The consideration of alternate standards should carefully consider...

Mechanical Specification > Mechanical Interface Design > Form Factor

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

Functional Description

Profile • The Expansion Profile describes a class of supplemental boards designed to augment the capabilities of other profiles. 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 expanded capacity, expanded communications, or both....

Expansion Profile > Functional Description

Generalized Star

Other • The generalized star topology is a topology that attempts to wire the network together in such a way that each node is the center of a small star (see Figure). Given a dimension d, these networks will have d! nodes and each node will have a fixed degree of d-1....

Joint Architecture Standard Overview > Network Topologies > Generalized Star

Glossary

Other • Term Definition Adaptability A system design property that refers to an architecture’s ability to be easily changed or adjusted to accommodate different system needs. Address Translation allows addresses to be translated from abstract to physical Atomic An operation during which a processor can simultaneously read a location and write it...

Joint Architecture Standard Overview > Glossary

Results 26–50 of 117