CHANNEL SERVICE UNIT
\t͡ʃˈanə͡l sˈɜːvɪs jˈuːnɪt], \tʃˈanəl sˈɜːvɪs jˈuːnɪt], \tʃ_ˈa_n_əl s_ˈɜː_v_ɪ_s j_ˈuː_n_ɪ_t]\
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(CSU) A type of interface used to connect aterminal or computer to a digital medium in the same waythat a modem is used for connection to an analogue medium.A CSU is provided by the communication carrier to customerswho wish to use their own equipment to retime and regeneratethe incoming signals. The customer must supply all of thetransmit logic, receive logic and timing recovery in order touse the CSU, whereas a digital service unit DSU performsthese functions.
By Denis Howe
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