White Rabbit Switch Hardware with improved heat dissipation
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.
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
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.
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
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.
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.