Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
189 words
A method of detecting the recovery of fault in a looped data transmission system comprising looped transmission lines (36, 37) of two systems having different transmission directions, and a plurality of stations (31...35) and at least one control station (30) connected to said transmission lines (36, 37) of the two systems, wherein if fault occurs in the transmission lines (36, 37) of the two systems section, a loopback configuration is established such that stations (31, 35) adjacent to the faulty section send the signals from one system back to the other system, wherein the stations (31, 35) adjacent to the faulty section send supervisory signals (38) to each other via the faulty section and supervise the supervisory signals sent from the other station (35, 31) via the faulty section relative to each other, stations (32...34) included in the faulty section send the supervisory signals that are received from one system back to the other system, and when at least either one of the stations (31, 35) adjacent to the faulty section receives the supervisory signal, it is so judged that whole or portion of the faulty section is recovered.
Claim 2
Independent Claim
189 words
A method of detecting the recovery of fault in a looped data transmission system comprising looped transmission lines (36, 37) of two systems having different transmission directions, and a plurality of stations (31...35) and at least one control station (30) connected to said transmission lines (36, 37) of the two systems, wherein if fault occurs in the transmission lines (36, 37) of the two systems section, a loopback configuration is established such that stations (31, 35) adjacent to the faulty section send the signals from one system back to the other system, wherein the stations (31, 35) adjacent to the faulty section send supervisory signals (38) to each other via the faulty section and supervise the supervisory signals sent from the other station (35, 31) via the faulty section relative to each other, stations (32...34) included in the faulty section send the supervisory signals that are received from one system back to the other system, and when at least either one of the stations (31, 35) adjacent to the faulty section receives the supervisory signal, it is so judged that whole or portion of the faulty section is recovered.
Claim 3
Dependent Claim
37 words
The method of claim 1, wherein a station (35) which judges that whole or portion of the faulty section is recovered, informs the result of judgement to the control station (30) via the transmission lines (40, 41).
Claim 4
Dependent Claim
58 words
The method of claim 1, wherein the control station (30) sends a search command signal to the stations (31, 35) adjacent to the faulty section maintaining a predetermined period to inquire whether the faulty section is recovered or not, and the stations that have received said signal send a recovery answer in response to the search command signal.