CrayLink cabling prohibited on Origin 2000 deskside
compoobah at valleyimplants.com
Mon Dec 24 11:16:47 CST 2007
On Dec 24, 2007, at 1:39 AM, Richard wrote:
> Origin2000 and Onyx2 Deskside and Rackmount Installation Instructions
> Document Number 108-0155-002
> pg. 6-36
> "Caution: You cannot install CrayLink interconnect cabling on a
> standalone deskside system because of power grounding
> requirements. The power differential between two interconnected
> modules should not exceed 500 millivolts; otherwise severe damage
> can result to boards and other components inside the chassis. The
> power distribution unit (PDU) inside the rack provides a common
> ground source for the modules. In addition, the groundstraps are
> installed on multirack configurations to help provide common
> grounding across the racks as described in Section 6.16"
> That seems about as blunt as you can get.
I'm not sure about that- you can CrayLink to Origin 200s together, the
only requirement being the common ground (plug them into sockets with
the same ground, run a thick ground between the chassis, or (as I have)
stack them one on another if they don't have the skins).
If you can do it with an Origin 200, then you can do it with a Origin
2000, since the hardware is very similar. You might need to get
creative with the grounding, though, and make sure it's done well
(perhaps two grounding straps of ~12AWG connected to different
locations). Perhaps SGI did not design the ground point into the O2k
deskside as they did in the O200, but we're a creative bunch here.
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