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Data access arrangement (DAA) is a computer modem with a built-in electronic system that interfaces with public switched telephone networks (PSTN). DAA is required for PSTN devices, including set-top boxes, fax machines, private branch exchanges (PBX) and alarm systems.
DAA devices are isolated from high voltage phone lines, but system authorities require device registration. Preregistered DAA is built into most modems and devices.
DAA is also known as a telephone line interface circuit.
There are three international DAA standards:
A key DAA design factor is layout, which defines the area between line and modem components. Examples include: