Curtiss-Wright Defense Solutions

GTS/DEC/006 Smart Source Selector and PCM decommutator PCI board (20 Mbps) - 3 channels

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GTS/DEC/006 Product Sheet

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Features

Bit synchronizer
- Bit error rate performance within 1 dB of theory
- Programmable loop bandwidth (0.01 to 2.0%)
- Bit-rates up to 20 Mbps (NRZ-L codes)
Smart Source Selector
- Aligns over 350 bits
- Moving match window of 64 bits
- Uses signal quality estimates to weigh input signals
- Yields performance gain of up to 4.7 dB when all channels are used
PCM decommutator
- NRZ-L/M/S, BIØ-L, derandomizer (11,13,15,17, 23)
- True, Invert or Auto input polarity
- Sync word length up to 64 bits
- 0 to 16 bits sync word error tolerance
- 4 to 64 bits per word
- 80 to 524,288 bits per minor frame
- Programmable misses to loss, matches to lock (1-16)
- Supports digital IRIG-B 000, 001, 002, 003 time formats
Loopback tester
- Internal and external connection
- Generates PCM data with 16-bit counters

Applications

Real-time ground stations
Telemetry data links

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The GTS/DEC/006 reconstructs a serial PCM data stream from a source that has been corrupted by noise, phase jitter, amplitude modulation, or base line variations. The all-digital design utilizes three independent, programmable matched filters and Phase Locked Loops (PLL) to track deviations in the bit-rate of the received signals.

The output from the bit synchronizers is fed into the Smart Source Selector thereby producing a hard decision (1 or 0) based on the signal quality of the received bits. If the soft values are shifted in time, data is re-aligned prior to combining the soft values.

The recovered data is then decommutated into frames. Each minor frame can be tagged with time from an IRIG-B source to an accuracy of 1µs.

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