telecommunications Telecommunication, often used in its plural form or abbreviated as telecom, is the transmission of information over a distance using electronic means, typically through cables, radio waves, or other communication technologies. These means of ...

, a customer service unit (CSU) is a device that provides an accessing arrangement at a

user Ancient Egyptian roles * User (ancient Egyptian official), an ancient Egyptian nomarch (governor) of the Eighth Dynasty * Useramen, an ancient Egyptian vizier also called "User" Other uses * User (computing), a person (or software) using an ...

location to either switched or point-to-point, data-conditioned circuits at a specifically established

data signaling rate In telecommunications, data signaling rate (DSR), also known as gross bit rate, is the aggregate rate at which data passes a point in the transmission (telecommunications), transmission data link, path of a data transmission system. Properties ...

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

References

Local loop {{telecomm-stub