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The transistorizing of buried dependent repeaters permits economical dc power feeding over long distances. With small diameter cables, the total cost of the system will be a minimum. By burying repeaters, it is possible to control the gain by ambient temperature. In spite of the compensation, a small residual equalization error cannot be avoided. Therefore, some pilot-regulated repeaters are provided. The regulators are of the memory type. The amplifiers are protected against overvoltages. In case of a fault, a dc fault location method is used if the power feeding is interrupted. If not, a pulse type fault location. method allows the identification of the faulty repeater section. Within the terminal repeaters, the adjustable equalizer compensates for the accumulated errors due to cable and equipment tolerances. In order to extract and inject signals, branching-off and blocking filters panels are provided. The line equipments meet the CCITT recommendations for highquality speech circuits. Additional customers' specifications, such as frequency response, level stability, overload characteristics, and noise performance are also met. Measured values of these characteristics are included.