ACRA CONTROL
GTS/DEC/004
Dual-channel 20Mbps Smart Source Selector and PCM decommutator PCI card
Description
The GTS/DEC/004 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 two independent, programmable matched filters and Phase Locked Loops (PLLs) to track deviations in the bit-rate of the received signals.
The GTS/DEC/004 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 two independent, programmable matched filters and Phase Locked Loops (PLLs) 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.
Features
- Bit error rate performance within 1dB of theory
- Programmable loop bandwidth (0.01 to 2.0%)
- Bit-rates up to 20Mbps (NRZ-L codes)
- Aligns over 350 bits
- Moving match window of 64 bits
- Uses signal quality estimates to weigh input signals
- 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
- Internal and external connection
- Generates PCM data with 16-bit counters
Applications
- Real-time ground stations
- Telemetry data links
First of two bit synchronizers, Smart Source Selector and PCM decommutator channels