FIELD: radio engineering and communications.
SUBSTANCE: invention relates to communication engineering and can be used in optical communication systems. For this purpose, during detecting warning information which initiates switching reservation group of multiplexing section, a unit, which does not make a decision, in the reservation group of multiplexing section through the network elements determines whether the condition of communication line with the unit which makes a decision, in the reservation group of multiplexing section through the network elements is properly operating or not, and displays warning information on the transmitting end of the optical fibre, which operates as a the reservation group of the opposite end, if the communication line is faulty.
EFFECT: high reliability of communication.
10 cl, 7 dwg
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