Model 501V 32Mbps VME Bit Synchronizer

Model 501V 32Mbps VME Bit Synchronizer

Product Support

Tunable from 8bps to 32Mbps (NRZ codes) and 16 Mbps (all others)
Processes all IRIG standard and randomized codes
Independent PCM encoder with both internal and external clock/data inputs
Fast sync acquisition - less than 32 bits, typical
Excellent BER performance, 1dB or better
Direct decoding/encoding of TTL or RS422 clock/data sources
Frame Synchronizer with auto-polarity and automated data source selector
Full featured BERT with "live” data BER monitor
Field upgradeable options module for future expansion

Technical Manual

Program & User's Manual

Datasheet

Technical Specs

Software & Drivers

Overview

The 501V PCM Bit Synchronizer is a state of the art bit synchronizer featuring tunable data rates from 8Hz to 32MHz for NRZ codes and to 16MHz for others.

The 501V is suppiled with the Model 2220V or Model 2222V Telemetry Data Processor (Maximum 8), the Model 2440V Multi Bit Sync Chassis (Maximum 16) and the Model 2430V Bit Synchronizer (Maximum 2). A common software GUI can control these cards, independent of the chassis.

The Model 501V can be enhanced with a programmable logic module. Current options include Viterbi Decoding, a frame simulator/synchronizer and a built-in bit error rate test (BERT) generater/receiver. The logic module is reprogrammable and can be replaced in the field without any special tools, thus, minimizing down time when an upgrade becomes necessary. These unique capabilities allow you to respond quickly to evolving application requirements such as:

• Recovering data from newly defined or application specific coding schemes

• Creating canned formats for recovering data from concatenated or layered codes

• Monitoring data streams for frame synchronization to resolve ambiguities or polarity inversions typical with many modulation schemes

System Software

GUI Setup and Operation Status for the 501V is controlled via a single interface with drop down menus for individual cards. The software automatically recognizes all of the bit synchronizers as well as their features. Setup configurations can be stored and retrieved for all previous missions as a group or individually. A page lock command accessible via the GUI reminds users before executing new instructions in order to avoid mistakes during a live mission. Remote users can control the units via an Ethernet port. If two users are viewing the system simultaneously, both see the changes made in real time by either user.

Technical Specs

SYSTEM FUNCTIONS
Acroamatics Bit Synchronizer Software	Included
GUI Interface	Standard
Operating System	Windows 2000/XP
Special Features	Lock out per bit sync, Auto-sensing configuration, Setups stored per system or mission, Remote bit synchronizer GUI Display via Ethernet
SIGNAL INPUTS
Source	Program selectable: one of four inputs
Isolation	Greater than 60dB at 32Mhz
Impedance	Program selectable: Hi-Z/Lo-Z. Single Ended: 10kΩ/75Ω, Differential: 10kΩ/120Ω
Signal Level	Single Ended: 0.2 to 30V p-p, Differential: 0.2 to 25V 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
Derandomizer	Program selectable: RNRZ 9/11/15/17/23, forward/reverse
SYNCHRONIZATION
Bit Rate Range	8bps-32Mbps NRZ codes, 8bps-16Mbps all others
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 Maintenance	(LW=0.1%) –2dB NRZ-L and Biø-L codes
Sync Acquisition	(LW=1.6%, SNR > 12dB) Typically less than 32 bit periods
Sync Retention	(LW=0.1%, SNR > 3dB) Retains sync through > 128 consecutive dropouts
Bit Error Rate	(LW=0.1%) to within 1dB of ideal bit error rate performance curves
DATA/CLOCK OUTPUTS (TAPE & CODE OUTPUTS)
NRZ-L Data	Three TTL, one RS422/TTL
Data Clock	Two program selectable TTL: 0º, 90º, 180º, 270º
Quadrature Clocks	One each: 0º, 90º, 180º, 270º; RS422/TTL
2x Clock	One TTL, One RS422/TTL
Data Polarity	Program selectable: normal/inverted
SOFT BIT DECISION OUTPUT
Data/clock	Three bits Offset Binary plus 0º clock; TTL (open collector)
Sample Rate	Programmable to 32 megasamples per second
PCM ENCODER
Data Source	Program selectable: Recovered Data or External data, or Test generator
Outputs	One bipolar, 4V p-p; Two TTL; One RS422/TTL
Randomizer	Program selectable: RNRZ 9/11/15/17/23
PCM Codes	Program selectable: NRZ-L/M/S, Biø-L/M/S, DBiø-M/S, DM-M/S, MDM-M/S, RZ
EXTERNAL DATA/CLOCK INPUT
Signal Type	Selectable: RS422 or TTL
Impedance	120Ω RS422, 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
CONVOLUTIONAL ENCODER/DECODER (OPTIONAL)
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
Symbol Formats	serial, parallel, and staggered parallel
FORMAT GENERATOR/SYNCHRONIZER (OPTIONAL)
Format Generator	Programmable frame length, sync pattern and mask
Synchronizer Source	Program selectable: 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
BIT ERROR RATE TESTER (OPTIONAL)
Transmitter Pattern	PRN sequence: 2⁷-1, 2⁹-1, 2¹¹-1, 2¹⁵-1 (forward/reverse)
Pattern Generator Clock	Selectable: Clock, External Clock or Programmable Clock 1bps to 40Mbps
Blanking	Program selectable: 32, 64, 128 bits -synchronized to BER counter
BER Sample Period	Program selectable: 10³ to 10⁹ bit periods, or continuous accumulate
Other Features	Automatic pattern synchronization, forced error ON/OFF, Tape out attentuator
PHYSICAL
Format	Single Slot 6U VME
Cooling Requirements	30 Linear FPM
Power Requirements	+5VDC at 1.25 Amp, +12VDC at 800mA, -12VDC at 500mA
Temperature	Operating 0 to +40°C, non-operating –40 to +86°C
Relative Humidity	Up to 90% non-condensing
Shock	Operating 6G, Non-operating 50G
Vibration	Operating 0.5G, 5 to 2000Hz, Non-Operating 1.2G, 5 to 500Hz
specifications subject to change without notice