Science Standalone Switch White Rabbit by Creotech

White Rabbit Switch by Creotech

The White Rabbit Switch by Creotech provides sub-nanosecond accuracy and picoseconds precision of synchronization for large distributed systems.

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White Rabbit Switch allows for deterministic and reliable data delivery. WRS allows you to precisely time-tag measured data and lets you trigger data taking in large installations while at the same time using the same network to transmit data. White Rabbit Switch works on a distance range over 10km using optic fiber and allows to connect thousands of nodes in the network.

Technical Parameters

Front Panel

  • 5 SMC connectors (1-PPS input and output, 62.5 MHz output, 10 MHz input)
  • 18 cages for Gigabit SFP transceivers (connected to Xilinx GTXs)
  • 10/100 Ethernet management port (connected to ARM CPU)
  • Mini-USB UART management port (connected to ARM CPU)
  • Power and Status LEDs
  • Link and Act LEDs for each SFP cage

Back Panel

  • 2x Mini-USB UART debugging port (connected to ARM CPU and FPGA I/O pins)
  • 2x cooling fan
  • 2x microswitch, power button
  • 1x grounding connector

Programmable resources

  • Xilinx Virtex-6 FPGA (LX240T FFG1156)
  • ARM Atmel AT91 SAM9G45 CPU – 400MHz

Clocking resources

  • 1x Low-Jitter Clock Generator (Synthesizer 28-683MHz TI CDCM61002, used as DMTD offset clock in WR Switch HDL)
  • 1x 25MHz VCXO, FRETHE025 controlled by DAC with SPI interface (AD5662 16bit 2.7-5.54V, used to drive CDCM61002 generator)
  • 1x 25MHz VCO controlled by DAC with SPI interface (AD5662 16bit 2.7-5.54V, used to drive AD9516 generator)
  • 1x 25MHz XO oscillator FNETHE025 (main FPGA clock)
  • PLL – 14 Output Clock Generator with Integrated 1.6 GHz VCO (AD9516, clock signals for Xilinx GTXs, µTCA connectors)
  • 1x Internal Oscillator (VM53S3-25.000, tuned to follow WR master clock or followed in Free Running mode)


  • 64MB DDR2
  • 256MB NAND
  • 8MB boot flash


  • Linux – kernel v3.16.38
  • Timing – WRP daemon (node discovery, etc.) PTPv2 daemon


  • 1x protocols (multicasting, spanning tree, GMRP/-GARP)
  • VLAN Tagging
  • SNMP switch management


  • Protocols: TCP/IP, SSH, SNMP, TFTP, DHCP, ARP, DNS
  • 1x FPGA JTAG connector
  • 1x ARM JTAG connector
  • 2x I2C multiplexer (PCA9548A)
  • 1x I2C GPIO driver (PCA9554PW, driving Power and Status LEDs on the front panel)
  • 9x I2C GPIO driver (PCA9554PW, driving LEDs for each SFP cage)
  • Power supply 100-240VAC, 2.0A, 50-60Hz input, 12VDC, 6.66A, 80W output


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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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.

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