FIELD: data transmission in communication network; troubleshooting in communication network. SUBSTANCE: open circuits can be located by using ring-circuit inspection method. Ring-circuit inspection method includes generation, transfer, and analysis of specialized data bursts passed over electrical communication connections sequentially from one point to other. If data burst fails to pass over communication link, it points to open circuit; in this case network control system is informed about open-circuit location and adequate measures are taken to enable operator bypass this point of line. Ring-circuit inspection method may be used on as required basis thereby saving time and resources of network. EFFECT: facilitated troubleshooting procedure. 52 cl, 8 dwg
