Definition
A wide-area data communications network used by the FAA to carry administrative (non-operational) traffic between FAA facilities, offices, and personnel. It handles routine business data such as email, file transfers, and internal applications, and is kept separate from the operational networks that move air traffic control data.
Plain English
The FAA's internal office computer network. It moves everyday work data between FAA buildings and staff, and is not the system that controls air traffic.
Context Anchor
You may see ADTN2000 in FAA acronym lists, NOTAM-related references, or descriptions of FAA information systems, rather than in normal cockpit procedures.
Derivation
The letters come from the first letters of Administrative Data Transmission Network. The “2000” is part of the system name and identifies that network generation; it is not a number a pilot enters into aircraft equipment.
Why Pilots Care
Pilots don't use ADTN2000 directly. It's worth recognizing only so the acronym doesn't cause confusion when scanning FAA reference material.
Intuition Check
Do not treat ADTN2000 as something to tune, fly, or request. It names a ground data network used by FAA systems.
Example Sentence 1
Routine FAA office traffic, such as internal email and file sharing, moves across ADTN2000 rather than across operational air traffic systems.
Example Sentence 2
The flight plan update traveled over the ADTN2000 before reaching the tower.