Telemetry Card & Modular Interface Products

Model 1611AP 72 Mbps PCM Bit Synchronizer PCI Card
Acroamatics’ Model 1611AP is a state-of-the-art Digital Bit Synchronizer featuring an advanced design that supports data rates from 8 Hz to 72 MHz. The design of the bit synchronizer uses the latest techniques in FIR filtering, digital phase-locked loops, NCO clock reconstruction, and digital amplitude and offset control. Use of leading-edge FPGAs results in reduced part count, increased reliability, and design flexibility to accommodate custom or future requirements. The Model 1611AP is a “drop-in” replacement for the any Bit Synchronizer application and is fully compatible with Acroamatics 2430AD & 2950AP Bit Sync, 2900AP TM processing system, and 2602P BSS product lines. The Model 1611AP is compatible with all previous versions of Acroamatics Bit Synchronizer Software, so it can also be installed in most ACRO telemetry data processor (TDP) systems with no special preparations. Like its predecessor, optional features include a full-featured BERT, Frame Synchronizer with data source selector and Viterbi Decoder/Convolutional Encoder.


  1. Compact and full featured
  2. Single PCI slot range quality bit sync
  3. Add plug-in 474DM mezzanine for single-slot dual channel operations
  4. NEW 72 Mbps NRZ Code Rate Range to 40 Mbps, bi-phase codes
  5. 8 bps to 40 Mbps, standard
  6. Best in Class Performance - within 0.50 db of theory in all modes
  7. Fast sync acquisition - within 50 bit transitions, typical
  8. Best in Class Sync Retention to 1024 bits without transition
  9. Bit Sync Status Monitors
  10.      • Lock/Search/Loss discretes
         • On Screen Performance Monitor
         - Input Amplitude, Offset, rate, Deviation, and Lock Status
  11. Data Quality and Signal Test
  12.      • BERT/PRN BER Link Test Mode
         • Frame Sync PCM BER Monitor
         • Frame Loss/Lock Monitor
         • Eb/No Signal Quality Analog Out
         • Viterbi Error Monitor/Stats
  13. Data Simulator/Generator
  14.      • Programmable rate, PRN code, PCM Format and Code - to 40 Mbps
  15. Processes all IRIG Codes
  16.      • NRZ-L/M/S, DBio-M/S, MDM-M/S, RZ
         • Randomizer/Derandomizer
  17. Descrambler
  18.      • CCITT V.35, INTELSAT, G2 Invert
Includes Windows 7 & 10 local and remote software.

5 inputs, 3 single-ended/1 differential/1 TTL/RS-422, Operator Program Selectable
Greater than 60dB at 20MHz
Program selectable: Hi-Z/Lo-Z, Single Ended: 4kΩ /75Ω , Differential: 10kΩ / 150Ω
Signal Level
Single Ended: 0.2 to 20V p-p, Differential: 0.2 to 10V P-P
DC Offset
20V max Single-Ended, Hi-Z or 15V Max @ 75Ω
Baseline Variation
Tracks sinusoidal offsets to 100% p-p signal amplitude at 0.1% bit rate
PCM Codes
Program selectable: NRZ-L/M/S, Biø-L/M/S, DBiø-M/S, DM-M/S, MDM-M/S, RZ
Program selectable: RNRZ 9/11/15/17/23, forward/reverse


Bit Rate Range
8bps to 40MHz, all PCM Codes
Tuning Resolution
0.1% of bit rate
Capture Range
3 times the programmed loopwidth, typical
Tracking Range
±12% typical, with programmable limiter
Loop Bandwidth
0.1% to 3.2%, program selectable in 0.1% increments
Sync Threshold
0db for NRZ-L and Biø-L codes
Sync Acquisition
(LW=1.6%, SNR > 12dB) Typically less than 50 bit periods
Sync Retention
(LW=0.1%, SNR > 3dB) Retains sync through > 1024 consecutive dropouts
Bit Error Rate
(LW=0.1%) to within .50 dB of ideal bit error rate performance curves


NRZ-L Data
One each, NRZ-L data/clock pair, RS422/TTL (jumper selectable) - operator program output selectable to INTERNAL (direct to host decom card via internet bus) or EXTERNAL (output pair directed to card external output BNC or Triax cables)
Data Clock
0°, 90°, 180°, 270°, operator program selectable
Data Polarity
Program selectable: normal/inverted


Data Source
Program selectable: Recovered Data (Bit Sync NRZ-L Data/Clock Out) or External Data/Clock Defaults to Recovered Data. Three each: One each TTL data/clock (0° & 180° selectable) Code (selectable) PCM and Clock, One each TTL data RNRZL, One each TAPE (code selectable) TTL or ±2 Volts balanced output, 50mA drive current.
Program selectable: RNRZ 9/11/15/17/23, forward/reverse
PCM Codes
Program selectable: NRZ-L/M/S, Biø-L//M/S, DBiø-M/S, DM-M/S, MDM-M/S, RZ


Signal Type
Jumper selectable: RS-422 or TTL
120Ω , RS-422, 75Ω TTL
Data Code
Program selectable: NRZ-L/M/S, Biø-L/M/S, DBiø-M/S, DM-M/S, MDM-M/S, RZ
Data Clock
Program selectable: Normal/Inverted, 1x or 2x


Viterbi Decoder
Rate 1/2, k=7: includes differential decoding, V.35 descrambling, and G2 invert (others available)
Symbol Formats
Serial, parallel, and staggered parallel (others available)
Convolution Encoder
Rate 1/2, k=7: includes differential encoder, V.35 scrambler, and G2 inverter (others available)
Symbol Formats
Serial, parallel, and staggered parallel (others available)


Format Generator
Programmable frame length, sync pattern and mask
Synchronizer Source
Recovered data, external data or test generator
Synchronizer Strategy
Pattern match in "search", programmable error limits for "check" and "lock" states
Other Features
Bit slip enable, auto polarity enable, data source/ambiguity resolution


Transmitter Pattern
PRN sequence: PN7, PN9, PN11, PN15 (forward/reverse)
Pattern Clock Source
Program selectable: Bit Rate Clock or External Clock
Program selectable: 64, 128, 256 bits
BER Sample Period
Program selectable: 1E3 to 1E9 bit periods, or continuous accumulate
Variable Output
50mV to 5V P-P
Other Features
Automatic pattern sychronization, forced error ON/OFF


Standard PCI: full length single slot
25-pin nicro-D connector (BNC type adapter cable available)
30 Linear FPM
+3.3VDC @ 1.0A, +5VDC @ 2.0A
4.40" (11.17cm) H x 12.40" (31.50cm) W x .50" (1.27cm) D
Operating: 0° to +40° C, Non-operating -40° to 86° C
Relative Humidity
Up to 90% non-condensing
Operating 6G, Non-operating 25G

Specifications subject to change without notice.