# Customer service unit

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{{Short description|Telecommunications device}}
{{one source|date=July 2024}}
{{Use dmy dates|date=July 2024}}

In [telecommunications](/source/telecommunications), a '''customer service unit''' (CSU) is a device that provides an accessing arrangement at a [user](/source/User_(telecommunications)) location to either switched or [point-to-point](/source/Point-to-point_(telecommunications)), [data-conditioned](/source/Data_conditioning) circuits at a specifically established [data signaling rate](/source/data_signaling_rate).

A CSU provides local [loop](/source/loop_(telecommunication)) [equalization](/source/equalization_(communications)), transient protection, isolation, and [central office](/source/telephone_exchange) [loop-back](/source/loop-back) testing capability.

==References==
{{FS1037C}}

Category:Local loop

{{telecomm-infrastructure-stub}}

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Adapted from the Wikipedia article [Customer service unit](https://en.wikipedia.org/wiki/Customer_service_unit) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Customer_service_unit?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.