The Mitel MH89625C SLIC (Subscriber Line Interface Circuit) provides a complete interface between an off-premise telephone line and a digital switching system. All BORSCHT functions of Battery Feed, Overvoltage Protection, Ringing Feed, Line Supervision, Codec, 2-4 Wire Hybrid and Test are provided requiring only a few external components. The input impedance conforms with Chinese standard requirements. The device is fabricated using thick film hybrid technology which incorporates various technologies for high voltage capability, optimum circuit design and very high reliability.