What is the primary use of a Digital Service Unit (DSU)?

The primary use of a Digital Service Unit (DSU) is to connect to digital leased lines. A DSU is a device that interfaces digital data terminal equipment (DTE) to the digital transmission facilities of a telecommunications carrier. It converts the digital signals from a local network into a format suitable for transmission over digital lines such as T1 or T3 lines. This is essential for ensuring that a business can utilize high-speed data communication services provided by telecommunications companies through leased lines.

Connecting local area networks, providing Network Address Translation, or managing wireless connections do not capture the core functionality of a DSU. Those tasks are typically managed by routers or other types of network devices specialized for such roles. The DSU's most critical role focuses on maintaining a reliable and efficient link to contracted digital lines, reinforcing the importance of its function in networking.