Profile • Instantiations of this profile are intended to function as primary-to-secondary power converters, producing the secondary voltage rail(s) that are distributed to other nodes. The ‘Local POL Power Conversion’ section mentions one “or more secondary voltage rails” being produced by the PS node. One voltage rail (typically +5 or +12 V)...
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Functional Description
Profile • The PS profile defines the technologies that comprise the PS node, including both required and recommended components to define this standard node type. A block diagram of a node instantiated against the PS profile is shown below: PS Profile Block Diagram The primary components for PS node instantiations will include...
Local POL Power Conversion
Profile • PS Node Local POL Conversion The output power from the PS node is one or more secondary voltage rails that are distributed throughout the system. This distributed secondary voltage is typically a higher voltage than those required by the components on the other nodes in order to improve efficiency by...
Mechanical
Profile • The recommended PS implementation is on a 6U VPX board, as defined in the VITA 46 standard and the Mechanical Specification. VPX is preferred for a number of reasons, a few of which include: 3U and 6U board formats to accommodate varying sizes High-density connectors and flexible pinout Availability of...
Megabit-class Interfaces
Profile • There are several megabit-class interfaces that may be utilized on the PS node. Some examples of these include: SpaceWire RS-422, RS-232 MIL-STD-1553 CAN bus SpaceWire is the preferred solution for systems requiring data rates below 200 Mbps. SpaceWire links can scale from 2 to 200 Mbps and are well suited...
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 megabit-class interfaces, with line speeds below one gigabit per second ( The protocols...
Power Supply Profile
Profile • The PS profile defines a high-performance power solution, suitable for powering JAS nodes. The PS profile works alongside the CH and RP profiles to implement groups of nodes (i.e., boxes) within the JAS architecture. The SMAC and Communications profile implement connectivity and data transfer from PS nodes to other nodes...
Primary DC to DC Conversion
Profile • PS Node DC-DC Converters The PS node utilizes isolated DC-DC switching converter devices, which provide the primary power conversion capability for this node type. The DC-DC converter converts the primary bus voltage to a regulated secondary voltage that is distributed to the nodes in the system.
System Monitoring and Communication
Profile • PS Node System Monitoring and Communication An important element that must be included in each PS node is described in the SMAC Profile. The SMAC monitors and controls the state of the PS node. The SMAC also provides standard network interfaces for connectivity to other nodes.