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| Number | Title | Issue Date |
| 4455644 | Telecommunication fault detecting system A T-carrier digital test system which actively monitors each T-carrier wire pair on a time division multiplexing basis while either live communications or test signals are on the line, and determines from the monitored data whether an incipient or hard fa... | 06/19/1984 |
| 4406919 | Method and apparatus for monitoring intermediate regenerative repeaters A method and apparatus for monitoring remotely-fed intermediate regenerative repeaters, in which each intermediate regenerative repeater contains a digital signal regenerative repeater for the digital data signal transmitted and a telemetry signal regener... | 09/27/1983 |
| 4336610 | Method and an arrangement for address-free fault location by loop closure in message transmission links A method and an arrangement for the address-free fault locating by means of loop closure for a message transmission link which contains regenerating and/or amplifying intermediate stations in specific spacings provides that transmission links of this sort... | 06/22/1982 |
| 4334303 | Monitoring system for telecommunication links equipped with repeaters-regenerators Monitoring system for a forward and backward link equipped with two way repeaters-regenerators comprises a monitoring station including means for transmitting through the forward link information data and a low frequency control signal and for receiving t... | 06/08/1982 |
| 4317010 | Remote monitoring system for remote locating and gain regulating of amplification circuits in data transmission line The remote monitoring system locates individually the pairs of intermediate amplification circuits in a remote location in the transmission line between a monitoring station and a monitored station in which circuit a fault diminishing amplification is to ... | 02/23/1982 |
| 4278850 | Monitoring system for optical transmission line repeaters The error rate and the operation of repeaters inserted in an optical transmission line are monitored at the terminal station on land by transmitting the test signal and monitoring the response signal of repeaters through the optical data transmission line... | 07/14/1981 |
| 4266183 | Fault locating arrangement for a two-way repeatered transmission link A fault locating arrangement for a two-way repeatered transmission link comprising a source in one of the terminals to transmit a unique signal in a first transmission direction from the one of the terminals to the other of the terminals through the repea... | 05/05/1981 |
| 4220833 | Location of a faulty pulse form restorer in a cable system A pulse form restorer (pulse repeater) which detects that it is not passing pulse bit steam inserts a fixed resistor in series with the constant current cable power supply, and isolation of the faulty unit is accomplished by measurement of the voltage dro... | 09/02/1980 |
| 4187415 | Remote locating system for transmission faults in data transmission line having regenerative repeaters A remote locating system for remote locating the pairs of regenerative repeaters of a bidirectional data transmission line which is interconnected between a monotoring station and a monitored station. The monitoring station comprises a first low frequency... | 02/05/1980 |
| 4184056 | Fault locating system for optical telecommunications A fault locating system for optical telecommunications includes a central office and means associated therewith for generating a tone signal. Analog to digital conversion means convert the tone signal to a digital signal. Cable driving means, receiving th... | 01/15/1980 |
| 4025737 | Repeater monitoring and fault location A repeater monitoring and fault location system is disclosed for a submarine cable system which includes repeaters of the type having separate high band and low band amplifiers for two-way transmission over one cable. Each repeater includes an oscillator ... | 05/24/1977 |
| 4006320 | Fault locating system and method for transmission lines and repeater stations A communication system has at least one supervisory station and a large number of repeater stations spaced along a four-wire two-way transmission line. A number of repeater stations are selected at equal intervals along the line to have a coupling network... | 02/01/1977 |
| 3976835 | Supervisory systems for telecommunication line transmission system A repeater for a digital data-transmission system using a disparity-displaying digital code comprises a digital regenerator and error-detecting means therefor and in which supervisory control means incorporated in the repeater is operative upon reception ... | 08/24/1976 |
| 3959606 | Installation for checking a repeater of a transmission route The invention comes within the branch of the checking of repeaters formed by two semi-repeaters placed in units spaced out along a transmission network having multiple quads and comprising nodal derivation points for derivating a cable section into severa... | 05/25/1976 |
| 3950622 | Line fault locating system A method and means for fault testing the transmit and receive sections of repeaters which are connected in a pulse code modulation (PCM) transmission system, from a single end of said system, as described wherein testing between a first and second station... | 04/13/1976 |
