This telemetry processing architecture captures PCM bitstreams through TTL or RS-422 inputs, performs real-time decommutation at rates up to 20 Mbps, and transfers processed data through a VME-64 backplane using dedicated DMA engines. The Abaco Systems 4422-V64 integrates variable-length word processing (3-16 bits), IRIG time synchronization, and full-fidelity simulation capabilities into a 3U VME form factor optimized for ground station deployments.
## Technical Specifications
• Input data stream processing: up to 20 Mbps continuous
• PCM decommutation rate: 20 Mbps maximum
• PCM simulation output: up to 10 Mbps full-fidelity
• Word length processing: 3 to 16 bits variable
• Subframe decommutation methods: SFID, FAC, and URC
• Time code input: IRIG-A and IRIG-B compatible
• Bus interface: VME-64 with block mode transfers
• Power consumption: +5V at 1000mA + 10mA/Mbps, ±12V at 60mA
• Data signal levels: TTL and RS-422 compatible
• Form factor: 3U VME module
• On-board DMA engine with dedicated buffer memory
## Key Features
Variable word length processing eliminates preprocessing requirements for mixed telemetry formats. Multi-subframe support handles complex satellite telemetry without external frame synchronizers. The integrated DMA engine reduces CPU overhead during high-rate block transfers. IRIG time code readers provide microsecond timestamp accuracy for correlation analysis. Full-fidelity simulation mode enables closed-loop testing without external stimulus equipment. VME-64 implementation delivers sustained throughput for multi-stream ground stations.
## Typical Applications
Satellite ground control stations processing multiple simultaneous downlinks. Aerospace test facilities requiring MIL-STD-1553 telemetry analysis. Defense contractors developing CCSDS-compliant space communication systems. Research institutions analyzing scientific spacecraft data streams. Flight test programs capturing high-rate PCM telemetry from aircraft systems. Missile range instrumentation systems processing multiple vehicle telemetry feeds.
## Compatibility & Integration
Integrates with VMEbus chassis supporting 3U modules and VME-64 protocols. Compatible with T/MATE telemetry processing software suites. Accepts standard IRIG time distribution from GPS disciplined oscillators. Interfaces directly with RF telemetry receivers through RS-422 connections. Supports real-time operating systems including VxWorks and QNX for deterministic processing.
