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EP0440276B2 |
Optical fibre telecommunications line with separate service channels
Abstract of EP0440276 The invention refers to an optical fibre transmission line which comprises means (9, 10) for injecting and means (9, 10) for extracting optical service signals from the line'...
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6218959 |
Fail safe downhole signal repeater
A system and method of fail safe communication of information between surface equipment and downhole equipment are disclosed. The system comprises two or more repeaters (34, 35, 36) disposed within...
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6177882 |
Electromagnetic-to-acoustic and acoustic-to-electromagnetic repeaters and methods for use of same
A downhole communications system including an electromagnetic-to-acoustic signal repeater (35) for communicating information between surface equipment and downhole equipment and a method for use of...
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6147998 |
Method and apparatus for performing in-service quality of service testing
An apparatus and method for determining the QoS of a communication system. In one embodiment a service verification equipment device (SVE) is placed into the communications link between the wide...
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6144316 |
Electromagnetic and acoustic repeater and method for use of same
An electromagnetic and acoustic signal repeater (34) for communicating information between surface equipment and downhole equipment and a method for use of the repeater (34) is disclosed. The...
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6075461 |
Disposable electromagnetic signal repeater
An apparatus, method and system for communicating information between downhole equipment (40) and surface equipment is disclosed. The electromagnetic signal repeater apparatus (34, 36) comprises a...
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6018501 |
Subsea repeater and method for use of the same
A subsea repeater apparatus (48) for communicating information between surface equipment (60) and downhole equipment (44) is disclosed. The apparatus (48) comprises an electromagnetic receiver (66,...
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6018301 |
Disposable electromagnetic signal repeater
An apparatus, method and system for communicating information between downhole equipment (40) and surface equipment is disclosed. The electromagnetic signal repeater apparatus (34, 36) comprises a...
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5942990 |
Electromagnetic signal repeater and method for use of same
A downhole electromagnetic signal repeater (76) for communicating information between surface equipment and downhole equipment and a method for use of the repeater (76) is disclosed. The repeater...
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5778048 |
Feed imbalance detector in repeated line
A feed imbalance detector in a repeated line for detecting a feed imbalance in a PCM repeated line and for displaying an alarm includes: a constant current feeder for transmitting an operating...
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5475385 |
Analogue telemetry system and method for fault detection in optical transmission systems
An analogue telemetry system/method provides fault location in an optical transmission system including optical fibre amplifiers. Each amplifier has a respective optical pump source including an...
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5271035 |
Repeater supervision
An arrangement for signalling to supervisory equipment in a repeater in a digital transmission system. A digital data test sequence comprising a plurality of multi-bit words each accompanied by a...
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5252961 |
System for monitoring status of plurality of repeaters
A system for monitoring the status of a plurality of repeaters located along a transmission line connecting two terminal stations, wherein data is transmitted between the two terminal stations...
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5191595 |
T1 digital communications system for in-service detection and identification of malfunctioning repeaters
An improvement to T1 digital communications systems uses the alternate mark inversion (AMI) encoding format, typically used in T1 systems, and the D.C. system that powers the repeaters for enabling...
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EP0440276A2 |
Optical fibre telecommunications line with separate service channels.
The invention refers to an optical fibre transmission line which comprises means (9, 10) for injecting and means (9, 10) for extracting optical service signals from the line' s optical fibre (3),...
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4677644 |
Method and apparatus for remote signalling by substituting a message for the data conveyed by a digital transmission link
The method consists in momentarily replacing the data in a transmitted digital data stream by a remote signalling message which is built up from consecutive sequences, each of which is obtained by...
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4565975 |
Synchronization of pull-in oscillators in the transmission of digital signals
Transmission lines for digital signals may include a large number--for example, several hundred--of intermediate generators. In this case, telemetering units are provided at the end points and at...
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