Abstract: In a repeater arrangment supplied with a sequence of input multiplexed signals to produce a sequence of output multiplexed signals, with stuff signals included in each of the input and the output multiplexed signals, the input multiplexed signals are demultiplexed by a demultiplexer into a plurality of demultiplexed signals assigned to channels and are stored in first-in-first-out (FIFO) memories with the stuff signals destuffed. Stuff information related to the destuffed signals is memorized in a stuff memory to be sent to a multiplexer. The multiplexer carries out readout operations of the respective FIFO memories with reference to the stuff information by the use of readout pulses which have the same rate and which can reproduce the stuff signals. A phase comparator compares phases of preselected pulses derived by the multiplexer and the demultiplexer with each other and controls a single phase-locked oscillator coupled to the multiplexer.