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. 

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 

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

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

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