CSU/DSU – Channel Service Unit/Data Service Unit

Short for Channel Service Unit/Data Service Unit.

The CSU is a device that connects a terminal to a digital line. Typically, the two devices are packaged as a single unit. The DSU is a device that performs protective and diagnostic functions for a telecommunications line.

You can think of it as a very high-powered and expensive modem. Such a device is required for both ends of a T-1 or T-3 connection, and the units at both ends must be set to the same communications standard.

Webopedia Staff
Webopedia Staff
Since 1995, more than 100 tech experts and researchers have kept Webopedia’s definitions, articles, and study guides up to date. For more information on current editorial staff, please visit our About page.

Top Articles

The Complete List of 1500+ Common Text Abbreviations & Acronyms

UPDATED: This article was updated April 6, 2021 by Web Webster   From A3 to ZZZ we list 1,559 text message and online chat abbreviations to...

How to Create a Website Shortcut on Your Desktop

UPDATED: This article was updated April 6, 2021 by Web Webster   This Webopedia guide will show you how to create a desktop shortcut to a...

Windows Operating System History & Versions

The Windows operating system (Windows OS) refers to a family of operating systems developed by Microsoft Corporation. We look at the history of Windows...

What are the 5 Generations of Computers?

UPDATED: This article was updated on April 6, 2021 by Web Webster   Learn about each of the 5 generations of computers and major technology developments...

Random Access Memory (RAM)...

UPDATED: This article Updated April 6, 2021 by Web Webster   Random Access Memory (RAM)...

OEM – original equipment...

UPDATED: This article was updated April 6, 2021 by Web Webster OEM (pronounced as...

Best ERP Software for...

UPDATED: This page was updated April 6, 2021 by Web Webster   Enterprise resource planning...