Model 2440V Multi-Channel Bit Synchronizer

The Model 2440V VME Multi-Channel Bit Synchronizer consists of up to sixteen 32Mbps PCM Bit Synchronizers in a single 7U VME chassis. The chassis includes a 12” flat panel display and retractable keyboard for fast and easy viewing of all setup parameters and status. Each bit synchronizer is configured independently from a simple to use GUI. The system includes dual redundant power supplies to minimize the loss of mission critical data.

At the heart of the Multi-channel system are the Model 501V 32Mbps Bit Synchronizer cards. Each 501V can be enhanced with a programmable logic module to provide an optional format synchronizer, a built-in bit error rate test (BERT) generator or support for unique decoding applications requiring non-standard codes or data formats. The logic module is reprogrammable and can be replaced in the field without any special tools, thus minimizing down time when a new application comes along. This upgradeability will allow you to respond quickly to evolving 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 displays are accessed through a built-in color LCD display and keyboard. Each of the Model 501V’s are controlled via a single interface with drop down menus for individual cards. The unit 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 unit via the included 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 Software Suite	Included
GUI Interface	Standard
Operating System	Windows 2000/XP
Configuration Storage	Limited only by disk space
Special Features	Lock out per bit synch, Auto-sensing configuration, Setups stored per system or mission. Remote GUI Display via Ethernet
CHASSIS
Form Factor	Standard VME
Available Slots	20
Processor	Pentium 4
DRAM	512MB to 2GB
Hard Drive	Call Factory
Display	12” Flat Panel
Keyboard	Retractable, track ball
Network	10/100/1000 Ethernet
Power	Single/Redundant 110/220V
Standard Outputs	Pre-configured 48 BNC’s
Standard Inputs	Pre-configured 64 BNC’s
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	Four bits Offset Binary plus 0º clock; TTL (open collector)
Sample Rate	Programmable to 20 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 PER CARD)
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 PER CARD)
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 PER CARD)
Transmitter Pattern	PRN sequence: 2⁷-1, 2⁹-1, 2¹¹-1, 2¹⁵-1 (forward/reverse)
Pattern Generator Clock	Program selectable: Bit Rate Clock or External Clock
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
PHYSICAL
Power	104-125 VAC (standard) 100/120/220/440 available; 47-63 Hz, 3A max
Dimensions	12.25" (31.12cm) H x 19.0" (48.26cm) W x 20.19" (51.28cm) D
Temperature	Operating 0 to +40° C, Non-Operating -40 to +86° C
Relative Humidity	Up to 90% non-condensing
Shock	6G, Non-operating 50G
Vibration	Operating 0.5G, 5 to 2000 Hz, Non-operating 1.2G, 5 to 500 Hz
specifications subject to change without notice