White Rabbit Switch Hardware with improved heat dissipation
Project description
The White Rabbit Switch is the central element of a White Rabbit network and was designed as a part of the White Rabbit project. The current version of WRS 3.4 is built with two fans to provide forced air cooling. Measurement shows that when the fans fail, the temperature inside the WRS increases significantly, especially the FPGA chip.
Based on the WRS V3.4, the WRS-18 optimizes the layout of the SCB to improve the heat dissipation together with other smaller improvements. WRS-18 are open hardware designs licensed under CERN OHL 1.2, it can also be used as the hardware platform for other non-White Rabbit projects.
WRS-18B is a fan-less version of the WRS, specifically designed for long-term service-less operation and originated at the LHAASO project.
WRS-18A uses the same SCB and backplane, but integrates two fans inside the box with a modified heatsink. This version is suitable for high density rack installation.
Highlighted Features
- SMA connectors on front panel
- Power reboot button on front panel
- Dustproof cap for all front panel connectors
- Improved heat dissipation, fan-less version or fan version
- Optical SFP management port for long distance connection
- Integrated low jitter circuit
- Mounting options for various VCXOs
- Absolute calibration support
Main Features
- Front Panel
- 5 SMA connectors
- PPS-in / PPS-out / Clk-out (62.5MHz) / Clk-in (10MHz) / signal-out (software configurable)
- 18 cages for Gigabit SFP transceivers with EMI Shield (connected to Xilinx GTXs)
- Link and Act LEDs for each SFP cage through light guide pipe
- 10/100Mbps RJ45 management port (connected to ARM CPU)
- 100Mbps SFP optical management port (converted from the USB of the ARM CPU)
- USB port (connected to ARM CPU)
- USB-uart debugging port (connected to ARM CPU)
- Power and Status LEDs
- Power reboot button
- 5 SMA connectors
- Back Panel
- AC power jack
- Grounding connector
-
Clocking resources
- Integrated Low-jitter WRS daughterboard
- VM53S3-25.00 as default Internal Oscillator
- T604-025.0M, IVT32000C,DOT050V-020.0M, CVHD-950-100.000 can be mounted for evaluation.
- refer to SCB_clock_tree
- Xilinx Virtex-6 FPGA (XC6VLX240T as default, XC6VLX365T can be mounted upon request)
- ARM Atmel AT91 SAM9G45 CPU
- Memory:
- 64MB DDR2 / 256MB NAND / 8MB boot flash
- Others:
- 1x FPGA JTAG connector
- 1x ARM JTAG connector
- 2x QSS/QSH high speed connectors between SCB and backplane
- 4x u.FL Connectors for clock circuit test
- 2x u.FL Connectors for Absolute Calibration
- 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
- Certification
- CE
- CCC (China Compulsory Certification) (TBD)
WRS-18 consists of three elements:
- SCB_FL PCB - contains main electronics components, ARM processor, Xilinx FPGA chip, oscillators, memories, etc.
- backplane PCB - electrical connections to 18 SFP cages, debug USB-uart ports, LEDs, etc.
- WR Switch Box - is a 19'' 1U case. There are no cooling fans in the back for WRS-18B type. The box is specifically designed for passive cooling. Constructive heat dissipation plays an important role too.
Performance Test
Source code
All source code including firmware, operating system in ARM, embedded software in LM32 could be found in ohwr.org. They are all in branch hm-wrslj of corresponding repository. Please consult normal WR Switch development documents to build your own firmware and software.
Project information
Releases
Users List
- LHAASO@IHEP(Large High Altitude Air Shower Observatory), China
- JUNO@IHEP (Jiangmen Underground Neutrino Observatory), China
- HiAF@IMP, China
- CiADS@IMP, China
- CASIC（China Aerospace Science and Industry Corporation), China
- NovelMedical, China (365T version)
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Germany
- CRISO, Australia
- SINAP, China
- National Time Service Center, China
Contacts
Commercial producers
-
SyncTechnology
- a spinoff company from THU
General question about project
- Guanghua Gong - Tsinghua University, Beijing
Status
| Date | Event |
|---|---|
| 21-02-2018 | Start of project |
| 16-03-2018 | SCB_FL in repository, ready for review |
| 10-04-2018 | Backplane in repository, ready for review |
| 13-04-2018 | First batch of 10 SCB_FL assembled |
| 17-04-2018 | SCB_FL Review by 7S finished. Opinions will be included in next version |
| 20-04-2018 | Functional test passed with SCB_FL + Old mini-backplane (SFP0 removed) |
| 25-04-2018 | WRS-FL backplane assembled |
| 06-05-2018 | 5 WRS-FL prototypes tested. |
| 24-05-2018 | WRS-FL backplane redesigned for panel installation |
| 20-06-2018 | 5 WRS-FL with BKBv1.1 assembled |
| 25-06-2018 | WRS-FL demonstrated at 2nd WR tutorial workshop |
| 18-07-2018 | WRS-FL SCB redesigned |
| 20-08-2018 | First batch of 30 WRS-FL assembled |
| 04-09-2018 | Another 20 WRS-FL assembled |
| 05-09-2018 | SCBv1.2 low jitter function verified |
| 13-09-2018 | SCBv1.2 and BackplaneV1.2 publish and bug report |
| 14-09-2018 | SCB modified to V1.3 |
| 20-10-2018 | 50 WRS-FL under assembly for the LHAASO project |
| 12-11-2018 | 10 WRS-FL with low jitter support assembled and tested |
| 20-11-2018 | 40 WRS-FL under assembly for the LHAASO project |
| 08-12-2018 | Low jitter circuit support files released |
| 08-04-2019 | WRS-18B passes the CE Certification! |
| 30-07-2019 | Version with Fans introduced as WRS-18A |
| 20-09-2019 | Over 150 WRS-18A/WRS-18B installed at LHAASO site |
21 April 2020