Circumference

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May 31, 2018

Backplane, Raspberry Pi, and Ethernet Switch Assembly

In the previous update we took a look at how the 32+1 node Circumference 100 has evolved from the very first prototype — which used a great deal more cabling and an external power supply — to a highly integrated solution built around a custom backplane. However, we didn’t really give any detail on the backplane itself and how Raspberry Pi compute nodes are connected.

The above stop frame animation shows clearly how a stack comprised of 8x Raspberry Pi boards plus backplane is assembled, with each compute node securely attached to the backplane via high quality Samtec connectors, and separated by four M2.5 black nylon stand-offs. This sub-assembly is then secured to an acrylic plate which has had two 5-port Gigabit Ethernet switches attached.

With the C25, two Ethernet cables run direct to the UDOO dual-gigabit Ethernet adapter. While with the C100, there are 8x Ethernet cables that run into the base and connect into an additional two 5-port switches, which in turn are connected to a dual-gigabit Ethernet adapter. In both cases the only other connections are 1 or 4 each of USB cables for control, and 6-pin PCIe connectors for power.

So as you can see, it’s a pretty neat solution in terms of cabling.

Andrew and the Circumference Team

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$25

Circumference 25 Enamel Badge

The same C25 metal and vitreous enamel badge as can be found on the front of the 8+1 node cluster, albeit with a pin fastener. Wear your Circumference support with pride!


$549

Circumference 25 Early Bird

C25 8+1 node cluster limited early bird. Includes choice of acrylic colour case parts and a custom logo etched on the wood veneer front panel.


$599

Circumference 25

C25 8+1 node cluster campaign pricing.


$799

Circumference 25 Early Access

C25 8+1 node cluster with limited, early shipping. Includes choice of acrylic colour case parts and a custom logo etched on the wood veneer front panel.


$2,599

Circumference 100

C100 32+1 node cluster campaign pricing. Includes custom logo etched on the wood veneer front panel.

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Andrew Back

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