Project description
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.
Highlighted Features
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.
- Remote monitoring
- Distance range over 100km in single hop
- Sub-nanosecond time accuracy
Main Features
This section includes a description of the different hardware elements included in the WRS-LJ:
- Front Panel
- 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
- 5 SMC coaxial connectors(male):
- Back Panel
- USB Mini-B FGPA & USB Mini-B ARM for debugging
- RS232 input port
- Power supply
- input: 100-240VAC, 2.0A 50-60 Hz
- output: 12V DC, 6.66A – 80W max
- 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
- 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
Performance Test
Firmware and User-guide
Please follows the given links and register to our webpage to get more information about the WRS-LJ:
NOTE: The "official" firmware does not directly support this hardware. Unexpected behaviour might happen if you try to upload it.
Source code
All source code including firmware, operating system in ARM, embedded software in LM32 can be downloaded from open source repository.
Contacts
Commercial producers
-
Safran Navigation & Timing
- WR developer and producer company
Status
Date | Event |
---|---|
21-02-2018 | Start of project |
11-Oct-2020 | Publication of the result in WRITE/WR Workshop |
12-Nov-2020 | Publication of the project in OHWR |
12 November 2020