Customer service unit

In telecommunication, a customer service unit (CSU) is a device that provides an accessing arrangement at a user location to either switched or point-to-point, data-conditioned circuits at a specifically established data signaling rate.

Note: A CSU provides local loop equalization, transient protection, isolation, and central office loop-back testing capability.

References

 This article incorporates public domain material from the General Services Administration document "Federal Standard 1037C".

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