The White Rabbit Switch Low Jitter (WRS-3-LJ/18) is a new version of the White Rabbit Switch which counts with a series of improvements that enable its use in more demanding time and frequency distribution applications.
The WRS-LJ distributes Time and Frequency within sub-nanosecond accuracy to thousands of nodes through standard optical fiber, providing very low noise and accurate timing outputs.
The WRS-LJ integrates the low jitter circuitry within the SCB, which has been redesigned to reduce the power consumption and improve the thermic dissipation and reliability of the device.
Some of its most relevant features are listed below:
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.
Distance range over 100km in single hop
Sub-nanosecond time accuracy
This section includes a description of the different hardware elements included in the WRS-LJ:
5 SMC coaxial connectors(male):
10 MHz reference clock input (GPS/Cesium), 50 ohm
10MHz & 62.5 MHz output reference clock, 50 ohm
1PPS input, 50 ohm
1PPS output, 50 ohm
18 cages for Gigabit SFP transceivers
1000Base-T Ethernet port for remote management
USB mini-B port for local management
Power and Status LEDs
USB Mini-B FGPA & USB Mini-B ARM for debugging
RS232 input port
input: 100-240VAC, 2.0A 50-60 Hz
output: 12V DC, 6.66A – 80W max
FPGA: Xilinx Virtex-6 (LX240T)
CPU: ARM Atmel AT91 SAM9G45
Core: 400MHz (ARM926E)
Memories: 64MB DDR2 (16-bit bus chip), 256MB NAND flash chip