Octagonal Ports

There are two of these, one in the front and one in the back.

Note the front one in the picture below.  It's on the bottom to the side.

 For location, here's the rear of my R2-Q5 again.  The octagonal port is on the bottom to the side - you can just see it on the right close to the leg.  It's just about opposite of the front port.

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