The GDP Space Systems Model 225P provides the features to receive and process a telemetry data stream containing Minor Frame, Major Frame and an Asynchronously Embedded Frame. It accepts serial NRZL data and zero degree clock at up to 20 Mbps.

Features

• Minor Frame Synchronization on 4 to 64 bit patterns
• Subframe (Major Frame) Synchronization
• Asynchronous Frame Synchronization
• Bit Rate - 1 bps to 20 Mbps
• Minor Frame Length - 16 to 262,144 bits
• ID or Recycle Subframe Synchronization
• Word-by-Word Programming of Orientation, Word Length Parity Strip, Shift, Pass / Drop
• 16 bit ID Tag Programmable per Word

• Format Switching in Real Time
• Data Quality Monitor
• Data Display on Front Panel
• Output Rate Smoothing
• Front Panel Test Points for Data, Clock, Word, Minor Frame, Major Frame
• Remote Control RS232 or IEEE-488
• Rack Mountable 3.5 inch Chassis

The output consists of up to 16 bits of decommutated data and its associated 16 bit ID Tag presented on two parallel ports. The decommutator is programmable and full featured. User entries define each word being decommutated. Data orientation (MSB/LSB), Parity Strip, Data Shift and Pass / Drop are programmed on a word-by-word basis.

Automatic Format Switching triggered by the detection of a data stream pattern is supported. Two independent format structures are defined and stored in the unit by the user. A primary and secondary set of decommutation instructions determine the decommutation process which will apply to the telemetry stream before and after the detection of the trigger pattern.

Real time indication of the quality of the received data is displayed on the front panel and available on the remote control port. The number of Check or Lock Frames, Inverted Frames, Flywheel Frames and Lock Dropouts are stored and reported.