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


  • 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 


  • 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


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. 


More technical information:


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.

We are always eager to discuss your needs and plans.

Consult one of our Experts.

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