Bit Synchronizers

Model 2950AP 8 MHz to 40 MHz PCI Multi-Stream Bit Synchronizer 

2950-1Acroamatics’ Model 2950AP Multi-Stream Bit Synchronizer consists of up to sixteen 40 Mbps capable PCM Bit Synchronizers in a single 4U chassis. The Model 2950AP features a high intensity 8” LCD Touchscreen operator display & control panel as a standard feature, supporting both individual and group bit synchronizer parameter set-up, operation and status monitoring. Remote control of the unit is supported via Ethernet or serial remote interface, with Remote Control software provided to enable integrated remote set-up, control and monitoring of up to eight 8-stream Model 2950AP units from a single integrated remote operator interface. In addition, directly coupled LED status indicators provide precise bit sync lock and (with FSN option) live PCM frame sync lock status of each bit sync channel.

Each Model 2950AP bit sync is set-up, either individually or as a group, from the user-friendly GUI touchscreen operator interface. Storage for up to 20 system and individual channel set-ups is provided. Hot-swappable redundant power supplies assure rock solid system operation, while at the heart of the Model 2950AP Acroamatics’ newest generation of industry leading bit synchronizer modules – our all new Model 1611P and 474DM Advanced Digital Bit Sync modules assure industry leading signal processing to assure the best possible lock and error performance under even the most trying difficult circumstances.

The Model 2950AP and its constituent internal 1611AP and 474DM bit sync module designs represent the first truly new “clean sheet” approach to modern bit sync design in a generation. Incorporation of the latest PGA based digital FIR filtering, digital phase locked-loop, NCO clock reconstruction, and digital amplitude and offset control design techniques are the underlying reasons for the astounding performance of our new Advanced Digital bit synchronizer. The Model 2950AP offers users programmable rates from 8 Hz to 40 Mbps using a huge variety of input and output code types and formats.

Standard PCM Sync Pattern/BERT test and monitoring, and Viterbi and QPSK encoder/decoder options assure state-of-the-art data format compatibility with the latest telemetry code and data formatting standards.

Up to 16 Channels in 4u
  1. Just 22.5" in depth

Bit Rate Range, all codes
  1. 8 bps to 40 Mbps, standard

Best in Class Performance
  1. within 50db of theory, all codes

Fast sync acquisition
  1. within 50 bit transitions, typical

Best in Class Sync Retention
  1. to 1024 bits without transition

Bit Sync Status Monitors
  1. Front Panel LED Lock/Search/Loss
  2. On-screen Performance Monitor
  3.          - Input Amplitude, Offset Rate
             - Deviation, and Lock Status

Data Quality and Signal Test:
  1. BERT / PRN BER Link Test Mode
  2. Frame Sync PCM BER Monitor
  3. Frame Lock/Loss Monitor
  4. Eb/No Signal Quality Output
  5. Viterbi Error Monitor / Stats

Data Simulator/Generator
  1. Programmable rate, PRN code
  2. PCM Format and Code - to 40 Mbps

Processes all IRIG Codes
  1. NRZ-L/M/S, DBiø-M/S, DM-M/S, MDM-M/S, RZ
  2. Randomizer / Derandomizer

  1. CCITT V.35, INTELSAT, G2 Invert

Network compatible, includes Windows remote software

System Software

The Model 2950AP includes a distinctive and easily mastered operator interface accessed via its large high output front-panel LCD touchscreen display. Each of the high performance Bit Synchronizers installed within the system are controlled via its easy to follow GUI oriented, menu driven display panel. Clear and well labeled menu choices are provided, with distinctive status indicators and system setting choices. The 2950AP automatically recognizes its bit synchronizer hardware configuration, allowing upgrade and hardware changes without concern for hardware setting changes. Setup configurations are easily stored and retrieved, either as a group or individually. Remote users can control the unit via Ethernet port or serial interface with provided Acroamatics Remote Bit Sync Windows utility software. If two users are viewing the system simultaneously, both see the changes made in real-time by either user, in order to avoid errors.

System Functions

Operating Software
Local touch-screen GUI set-up, operations and status
GUI Interface
Front panel high intensity 8" touchscreen display, standard, with local keyboard/monitor connections provided
Operating System
Windows 7 Embedded
Configuration Settings
Yes, to 20 set-ups stored in NV local memory, any of which are assignable as default at start-up
Special Features
Auto-sensing configuration management, provided remote Windows remote software, hot-swappable redundant power


Form Factor
Standard 19" RETMA, 4u with integrated BNC/Triax rear panel signal I/O
Available Slots
Accommodates to eight sets of Acroamatics single or dual channel PCI Bit Sync Modules
Front panel removable HDD, and DVD/CD-RW
8" LCD high res touchscreen, front panel mounted. Rear panel located SVGA monitor and keyboard/mouse interfaces provided
via LCD touchscreen, or optional rackmount 1u retractable keyboard
I/O Ports
4 USB Ports, 1 RS-232
10/100/100BT Ethernet
Dual Hot-swappable Redundant 110/220v
Standard Inputs/Outputs
Pre-configured 88 BNC's, user definable

Signal Inputs

Program selectable: one of four inputs - only limited by total rear panel BNC/Triax count (88) in units with 9 or more bit syncs
Three (3) each BNC single-ended (75 ohm or Hi-Z), One (1) each Triax differential (150 Ohm or Hi-Z), standard. Custom options available.
Greater than 60dB at 40MHz
Program selectable: Hi-Z/Lo-Z, Single Ended: 4kΩ /75Ω , Differential: 10kΩ /150Ω
Signal Level
Single Ended: 0.1 to 15V p-p, Differential: 0.2 to 10V p-p
DC Offset
20V max Single-Ended, Hi-Z
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
8 Hz to 72 MHz NRZ Codes (to 40 MHz all Bi-Phase codes). Each channel individually assignable
Tuning Resolution
0.1% of bit rate
Capture Range
3 times that programmed loopwidth, typical
Tracking Range
±12% typical, with programmable limiter
Loop Bandwidth
0.1% to 3.2%, program electable in 0.1% increments
Sync Threshold
0dB for NRZ-L and Biø-L codes
Sync Maintenance
(LW-0.1%)-2dB NRZ-L and Biø-L codes
Sync Acquisition
(LW=1.6%, SNR > 12dB) Typically less than 50 bit periods
Sync Retention
(LW=p.1%, SNR > 3dB) Retains sync through > 1024 consecutive dropouts
Bit Error Rate
(LW=0.1%) within 0.5 of ideal bit error rate performance curves, in all codes and at all data rates

Remote Control Software

Remote GUI Setup and Operation Status Windows software is provided with the Model 2950AP allowing remote network or serial remote unit operations. Multiple 2950AP units and other bit synchronizer products may be remotely operated using the provided software, such that up to 64 bit sync channels can be controlled by a single host computer.

Data/Clock Outputs

NRZ-L Data
Three TTL, one RS-422/TTL
Data Clock
Two program selectable TTL: 0°, 90°, 180°, 270°
Quadrature Clocks
One each: 0°, 90°, 180°, 270°, RS-422/TTL
2x Clock
One TTL, One RS-422/TTL
Data Polarity
Program selectable: normal/inverted

Soft Bit Decision Output

Four bits Offset Binary plus 0° clock; TTL (open collector)
Sample Rate
Programmable to beyond 20 mega samples per second

PCM Encoder

Data Source
Program selectable: Recovered Data or External data/clock
One bipolar, 4V p-p; Two TTL; One RS-422/TTL
Program selectable: RNRZ 9/11/15/17/23
PCM Codes
Program selectable: NRZ-L/M/S, Biø-L/M/S, DBiø-L/M/S, DM-M/S, MDM-M/S, RZ

External Data/Clock Input

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, 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
Symbol Formats
Serial, parallel, and staggered parallel
Convolutional Encoder
Rate 1/2, k=7. Includes differential encoder, V.35 scrambler, and G2 inverter


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 211-1, 27-1, 29-1, 215-1 (forward/reverse)
Pattern Clock Source
Program selectable: Bit Rate Clock or External Clock
Program selectable: 32, 64, 128 bits
BER Sample Period
Program selectable: 103 to 109 bit periods, or continuous accumulate
Other Features
Automatic pattern synchronization, forced error ON/OFF


90-132V or 180-264V auto select, 50-60Hz, 4A max
4u 7" (31.12cm) H x 19.0" (48.26cm) W x 22.5" (57.15cm) D
Operating: 0° to +40° C, Non-operating: -40° to 86° C
Relative Humidity
Up to 90% non-condensing
Operating 6G, Non-operating 50G
Operating 0.5G, 5 to 2000 Hz, Non-operating 1.2G, 5 to 500 Hz
Signal I/O
88 BNC Connectors, with all I/O connections supported for up to eight channels. In 9-16 channel configurations, customer defined I/O assignment (to a max of 88 BNCs) is required.

Specifications subject to change without notice.