Science White Rabbit by Creotech

White Rabbit Switch with Low Jitter daughterboard (WRS-LJ)

New version of WRS with improved jitter performance can be used in more demanding time and frequency distribution applications. 

 

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Highlighted Features 

  • Improved clocking design in hardware and FPGA. 
  • Cleaner and more accurate 1-PPS output. 
  • Improved clock jitter and phase noise. 
  • Lower power consumption and better thermic dissipation. 
  • High reliability and improved MTFB. 
  • Remote monitoring 
  • Distance range over 100km in single hop 
  • Sub-nanosecond time accuracy 

Technical Parameters

Hardware 

  • 10 MHz input clock for GrandMaster operation 
    • wide input power range, from -10 dBm to 20 dBm, sinewave or square 
  • AD9516-4 low noise PLL for clock synthetization 
  • Low jitter VCTCXO, 20MHz 
    • Connor-Winfield DOT050 VCTCXO (DOT050V-020.0M), selected as fully protected from airflow 
    • Option to install another oscillator (14x9mm footprint)
      • Abracom ABLNO VCTCXO 
      • Crystek CCHD-950 VCTCXO 
      • IQOV-162-3 OCXO (CMOS output)
  • 16-bit DAC AD5662 to control the oscillator (used by White Rabbit PTP core) 

Front Panel 

  • 1 SMA: 10 MHz input clock (Low-Jitter) 
  • 5 SMC coaxial connectors (male): 
    • 10 MHz input clock 
    • 10MHz & 62.5 MHz output reference clock, 50 ohm 
    • 1PPS input, 50 ohm
    • 1PPS output, 50 ohm 
  • 18 cages for Gigabit SFP transceivers 
  • 1000 Base-T Ethernet port for remote management 
  • USB mini-B port for local management 
  • Power and Status LEDs 

 

Back Panel 

  • USB Mini-B FGPA & USB Mini-B ARM for debugging 
  • RS232 input port 

System on-chip 

  • FPGA: Xilinx Virtex-6 (LX240T) 
  • CPU: ARM Atmel AT91 SAM9G45 
  • Core: 400MHz (ARM926E) 
  • Memories: 64MB DDR2 (16-bit bus chip), 256MB NAND flash chip 

Power supply 

  • input: 100-240VAC, 2.0A 50-60 Hz 
  • output: 12V DC, 6.66A – 80W max 

Other 

  • Box dimensions: 447 mm x 44 mm x 223 mm 
  • Certifications: ISO-9001, ISO-14001, CE, RoHS, FCC, SE

Environmental conditions 

  • Humidity: 0% ~ 90% RH 
  • Temperature: -10ºC ~ +50ºC

Application

The White Rabbit Switch is a central element of a White Rabbit network for ultra-precise time and event distribution and was designed as a part of the White Rabbit project at CERN. It can be used for sub-nanosecond time synchronization of control and measurement systems distributed over large (multi-km) distances. 

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More technical information: https://ohwr.org/project/wrs-low-jitter/wikis/home

Support 

We offer electronics engineering consultancy services, including: custom modifications of hardware, custom firmware and gateware modifications, system design, integration and testing. 

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Please contact us concerning details of your order and any requirements you may have towards our equipment. All shipping details will be set up as well.

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