Meaning of CUSTOMER SERVICE UNIT (CSU) in English

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.

Telecommunication standard terms English vocab.      Английский словарь стандартных телекоммуникационных терминов.