Definition: CSU/DSU (Customer Service Unit/Digital Service Unit): Sometimes called a digital modem. It does not modulate or demodulate, but converts a computer's uni-polar digital signal to a bi-polar digital signal for transmission over ISDN lines. From Glossary of Distance Education and Internet Terminology
"CSU/DSU (Customer Service Unit/Digital Service Unit)"
By Juergen Haas, About.com
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