#import "@preview/acrostiche:0.2.0": *

#init-acronyms((
        "EET": ("Electromechanical Emission Tripwire",),
        "SBC": ("Single Board Computer",),
        "PoE": ("Power over Ethernet",),
    ))

#align(center)[#text(size:20pt)[EET Deployment Overview on Maerospace
Equipement]]

This document describes the planned installation of #acr("EET") measurement systems on Maerospace equipement.
The goal of theis initial installation is to evaluate the potential of using power consumption measurement to protect Maerospace equipement.
The protection capabilities may not be limited to cyber-attacks and may also include malfunctions or unforeseen behavior.
The type of equipement is also not limited to processing servers and may include gateway computers.

= Measurement Equipement

The measurement equipement (thereafter refered to as the #acr("EET") box or simply the box) comprises a Hall Effect sensor, a digitizer, and a #acr("SBC").
The box is powered through #acr("PoE") and thus uses the same Ethernet cable for power and communication.

#figure(
grid(
    columns: (1fr,1fr),
    align(center)[#image("images/box_1.png", width:90%)],
    align(center)[#image("images/box_2.png", width:90%)],
),
caption: "Example of EET box. Front and back views.",
)<fig:box>

= Planned Installation

The initial installation will deploy 6 boxes to measure DC power at different point in the system.
Because the goal is to remain minimaly invasive, only the exposed DC cables will be monitored.
The measurement points are:

 + 2 DC cable pairs from the power supply on the right (marked 1 on @fig:rack).
 + 3 DC cables from the power supply on the left (marked 2 on @fig:rack).
 + The gateway computer outside on the rack (not marked on @fig:rack).

#figure(
    image("images/rack_annotated.png", width:80%),
    caption: "Some of the measurement points.",
)<fig:rack>

The following equipement will be added to the system:

- 5 EET measurement boxes.
- 5 replacement cables for the cables that are monitored.
- 1 PoE switch.
- #text(red)[1 on-premis aggregator server]
