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- Asynchronous Transfer Mode : A technology for the transfer of fixed-length "cells" of digital information through specialized cell switches built on top of optical transmission networks; increasingly obsolescent
- Defense Information Systems Network : The shared Asynchronous Transfer Mode (ATM) terrestrial digital communications system for the U.S. military, onto which are layered routed networks such as NIPRNET, SIPRNET and JWICS
- Defense Intelligence Agency : One of the members of the United States intelligence community, charged with providing national-level analysis specifically relevant for military needs, and being the focal point for measurement and signature intelligence
- FASTLANE : A family of U.S. National Security Agency approved encryption devices for Asynchronous Transfer Mode (ATM), Synchronous Digital Hierarchy (SDH) and Synchronous Optical Network (SONET) transmission systems
- Global Information Grid : The overall computing and communications architecture and systems interconnecting the U.S. Department of Defense military and civilian organizations, other government agencies, and allied nations; information is at the strategic/theater and operational, not tactical levels
- Internet Protocol : A protocol that is used to transmit data across an Internet Protocol Suite-compatible network, "hop-by-hop" from the source host, through intermediate routers, to the destination host
- Internet : International "network of networks" that connects computers together through the Internet Protocol Suite and supports applications like Email and the World Wide Web.
- JWICS : A military and intelligence communications system approved for classified information designated collateral TOP SECRET, as well as any information in a compartmented control system such as Sensitive Compartmented Information (SCI) or Special Access Program (SAP)
- Joint Chiefs of Staff : The staff committee of the most senior members of the U.S. military services, charged with policy advice, doctrinal development, and preparedness rather than operational control of forces
- Joint Network Node : A transportable communications routing and circuit-switching node, designed as a transition into the Warfighter Information Network-Tactical
- Local area network : A range of techniques for interconnecting multiple computers, over physical media such as wire or over wireless radio, within a limited geographic area, typically multiples of 100 meters.
- SIPRNET : The shared United States Department of Defense network that carries the bulk of classified information, limited to a security classification of SECRET.
- TSEC- : The alphanumeric designation system for communications security (COMSEC) equipment under the control of the U.S. National Security Agency (NSA)
- Virtual private network : The emulation of a private Wide Area Network (WAN) facility using IP facilities, including the public Internet or private IP backbones.
- Warfighter Information Network–Tactical : Deployed in several increments of increasing capability, this is the partially deplyed tactical communications system for the U.S. Army, which have far more bandwidth and is becoming a mobile "on the move" self-organizing network; sometimes called the "tactical internet" Through the Army Battle Command System, it interfaces to the Global Information Grid.