FIELD: radio engineering, in particular, multichannel electric communications. SUBSTANCE: device has first and second automatic detectors. Goal of invention is achieved by introduced third and fourth automatic detectors, first, second and third AND gates, first, second and third NOT gates, electronic switch. Electronic switch and third and fourth automatic detectors provide duplex operations of automatic system for routing local ring networks. EFFECT: increased reliability of non-directed local ring network due to possibility to bypass and switch off fault line unit. 4 dwg
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