AUTOMATIC BYPASS FACILITY FOR COMMUNICATION NETWORKS Russian patent published in 2003 - IPC

FIELD: electric communication equipment used in analog communication networks if it is necessary to bypass failed network element, in particular. SUBSTANCE: according to invention there are used first and second units for connection to communication line, first and second electron switches, first and second amplifiers, four units converting test frequency, three AND gates and three NOT gates. In case of failure of second communication center signals are relayed with bypass of it from first communication center to third communication center and back due to disconnection of second communication center by first and third electron switches and cutting in of first and second amplifiers in direct and reverse directions instead of it. EFFECT: provision for automatic bypass and interlocking of failed intermediate center in fourwire bi- directional analog communication network. 5 dwg