WRS (White Rabbit Switch) is the central element of a White Rabbit network and was designed as a part of the White Rabbit project. WRS-FL (WR Switch Fan-less) is a fan-less version of the WRS based on V3.4. 

Highlight Features

•    SMA connectors on front panel
•    Power reboot button on front panel
•    Improved heat dissipation, without fan
•    Optical SFP management port for long distance connection
•    Integrated low jitter circuit (WRS-FL-LJ only)
•    Mounting options for various VCXOs
•    Absolute calibration support

WRS-FL

•    Front Panel (All connectors are equipped with dustproof cover) 

              5 SMA connectors ( 1-PPS inout, 1-PPS output, 62.5MHz output, software configurable output, 10MHz input)

              18 cages for Gigabit SFP transceivers with EMI shield (connected to Xilinx GTXs)

              10/100Mbps SFP Ethernet management port (converted from the USB port of the ARM CPU)

              USB port for debug/monitor （connected to ARM CPU and FPGA I/O pins）

              Power and status LEDs

              Link and activity LEDs for each SFP cage through light guide pipe

              Power reboot button

•     Back Panel

              220V AC power jack

              Ground connector

•     Xilinx Virtex-6 FPGA 

               XC6VLX240T as default, XC6VLX365T can be mounted on request

•     ARM Atmel AT91 SAM9G45 CPU
•     Memory 

             64MB DDR2 SDRAM , 256MB NAND FLASH,   8MB boot flash

•     Clocking resources

              Integrated Low-jitter WRS daughterboard for improved clock outputs 

              VM53S3-25.00 as default Internal Oscillator

              Support circuit for multiple VCXOs ( T604-025.0M, IVT32000C,DOT050V-020.0M, CVHD-950-100.000 )

•     Power supply 100-240VAC, 2.0A, 50-60Hz input, 12V DC, 6.66A, 80W output
•     Box dimensions 482.8 x 42.34 x 222 mm

WRS-FL-LJ 

       WRS-FL-LJ is a special version of WRS-FL with low jitter support, Comparing to standard WRS-FL, the WRS-FL-LJ includes two major improments:

   1:   adding an extra AD9516 for 10MHz clock input

   2:   replacing the TCVCXO VM53S with a better TCVCXO or OCXO. ( TCVCXO T604-025.0M is used )

* references to an external Rubidium frequency source (Microsemi 8040C)

More detailed test results can be found here.

It is an open hardware design licensed under CERN OHL 1.2. 

For more details and design documents, please visit website on OHWR.