Backpan or backplane?

[Chris Morton <salt -dot- morton -at- gmail -dot- com>]

I'm working on a user manual for a SCADA-driven programmable logic
controller (PLC). The unit accepts add-on cards, much like a desktop
personal computer.

Referring to the contextual samples below, my question pertains to the use
of "backpan" vs. "backplane." I think it's the latter, and can find online
support for this. The engineer who designed this unit, and its
predecessors, thinks it's the former. I can find no definition for this,
nor online support.

   - These terminal boards provide excellent lightning/surge protection and
   alleviate the need to install discrete interposing devices to the enclosure
   *backpan*.

   - <Model number> Card Chassis
   <Company name> 5 slot card chassis, including *backplane*:   1lb 3.5oz.
   ( 552g )
   <Company name>  12 slot card chassis, including *backplane*:


What's your take?

Thanks
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