What is this small Verizon box?

[Tangible23]

I inherited a gigabit Fios system that was once used for Internet, TV, and landline. I don't subscribe to TV, so I've been simplifying the mess of coax, MOCA boxes, etc. to simplify things. I want to get to the point where I can remove the Verizon gateway, and put my own router in its place.

I have one small box (see red arrow) that's connected to the ONT by a thick cable. Can someone tell me what it is, and whether I need it? 

[gs0b]

The picture hasn't been approved by the moderators yet.  When it does, I'd be surprised if it isn't the power supply.  It uses a rather thick cable to connect to the ONT.  Does the box have an AC cord, too?

If I'm wrong, the picture will reveal everything.  🙂

[Tangible23]

I believe the picture is now available. 

[gs0b]

It's the power supply.  Looks like the AC cord goes through a hole in the back board.

[Tangible23]

Thanks, VII. I didn’t think there would be wiring behind the backboard, but now it makes sense. 

So then the thin cable with the green plug is the fiber optic, right?

[gs0b · Accepted solution]

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@Tangible23 wrote:

Thanks, VII. I didn’t think there would be wiring behind the backboard, but now it makes sense. 

So then the thin cable with the green plug is the fiber optic, right?

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Yes, it's the fiber.

I'm just guessing where the power cable is located.  The picture doesn't show enough detail to confirm it's routing, but since I don't see it anywhere else I'm assuming it must be hidden.  I'm sure if you look closely you can find it.  Note there is a cap you can remove from the bottom side of the power supply to see the connections.