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| Number | Title | Issue Date |
| 8045851 | Method and apparatus for automatic restoration detection and automatic restoration of optical communication system Methods and apparatuses for automatic restoration detection and automatic restoration of optical communication system are disclosed. In the methods, a first station sends an automatic restoration detection message to a second station at the opposite side of a failed... | 10/25/2011 |
| 7437069 | Automatic power restoring method and optical communication system The present invention provides an automatic power restoring method capable of reliably detecting continuity by the dissolution of a line fault, to restore the optical power, even in a structure including an optical amplification medium on an optical transmission pat... | 10/14/2008 |
| 7346277 | Joint-layer restoration in packet-over-optical networks A joint “packet-optical” layer restoration mechanism protects against single, packet-layer router failures by managing network resources from both the packet layer and the optical transport layer in a synergistic manner. It reuses packet-layer router service-por... | 03/18/2008 |
| 7342877 | Method and system for providing a loop-free ring topology A method for preventing loops in a ring topology of a computer network is disclosed. The method includes receiving a packet at a node on a shared packet ring and inserting a header containing an ID identifying the node at which the packet was received on the ring as... | 03/11/2008 |
| 7302180 | Dual homing for DWDM networks in fiber rings First and second optical fibers carry information modulated on an optical carrier. Information modulated on the carrier is to be recovered and transmitted at a first node along the first and second optical fibers. The first node includes apparatus for receiving and ... | 11/27/2007 |
| 7245582 | Protection switching in a multi-stage switch fabric A network node includes a system enabling high-speed protection switching of traffic between respectively associated working and protection channels of a communications network. The node comprises a multi-stage switch fabric, an interface, and a toggle. The multi-st... | 07/17/2007 |
| 7168027 | Dynamic synchronization of data capture on an optical or other high speed communications link A method and system that dynamically adjusts link control parameters of a communications network. The communications network includes a transmitter coupled through a first data link to a receiver. The transmitter and receiver each have at least one associated link c... | 01/23/2007 |
| 7139477 | Method and system for diverting traffic in a communication network A method for diverting communication traffic in an optical network from a first optical link extending between a first and a second locations, to a second optical link extending either directly between the first and the second locations or via a third location, whic... | 11/21/2006 |
| 7130538 | Optical switch and networking method An optical node capable of automatically detecting its interconnectivity is disclosed. The node includes a light switch, a light source, light detector, a control circuit having a unique identification. The node sends its identification via each of its ports and als... | 10/31/2006 |
| 7119702 | Audible relay emulator A device to audibly verify the activation of a solid state relay. The device includes an audio output device that is coupled to the solid state relay to produce a sound when the solid state relay is activated. The sound produced by the audio output devices emulates ... | 10/10/2006 |
| 7099595 | Optical wavelength multiplexing transmission apparatus and optical output control method for optical wavelength multiplexing transmission apparatus The present invention provides an optical wavelength multiplexing transmission apparatus and an optical output control method for an optical wavelength multiplexing transmission apparatus in an optical wavelength multiplexing transmission system using a main signal ... | 08/29/2006 |
| 7072580 | Autoprotected optical communication ring network An autoprotected optical communication ring network includes a first and a second optical carrier having opposite transmission directions and a plurality of optically reconfigurable nodes optically connected along the first and the second optical carrier and adapted... | 07/04/2006 |
| 7024110 | Optical switch having an autorestoration feature for switching from a backup optical path to a primary optical path Optical switches are provided in an optical transmission system having at least two optical nodes in optical communication over a primary optical path and a backup optical path. An optical switch is located in each of the optical nodes. Each of the optical switches ... | 04/04/2006 |
| 7002784 | Current compensation method and device for power system protection The present invention relates to a method for current compensation of a protection system for protecting a zone in a power system, which zone comprises a number of transmission lines connected to power sources and a number of transmission lines connected to a number... | 02/21/2006 |
| 6999411 | System and method for router arbiter protection switching In a router with redundant central arbiters, a set of control processors (CPs) determines which arbiter is active, which is standby, and when to switch between them. In normal operation ingress ASICs issue requests to the active central arbiter ASIC and keep-alive r... | 02/14/2006 |
| 6973267 | Autoprotected optical communication ring network An autoprotected optical communication ring network is disclosed. The ring network includes two optical carriers that are arranged for bidirectional transmission. Multiple optically reconfigurable nodes are connected along the optical carriers. The nodes communicate... | 12/06/2005 |
| 6961876 | Automatic handling of link failures A method and system for I/O adapters that must rely on a central processor to handle all inbound link events to reduce the number of events signaled to the central processor with hardware state machines that sort out the significant link events and automatically gen... | 11/01/2005 |
| 6947623 | Signals and methods for increasing reliability in optical network equipment Methods, apparatus and systems for regenerating, monitoring and bridging optical signals through an optical cross-connect switch to provide increased reliability. A self testing method, apparatus and system for an optical cross-connect switch. An optical-to-electric... | 09/20/2005 |
| 6944362 | Optical switch having a autorestoration feature for switching from a backup optical path to a primary optical path Optical switches are provided in an optical transmission system having at least two optical nodes in optical communication over a primary optical path and a backup optical path. An optical switch is located in each of the optical nodes. Each of the optical switches ... | 09/13/2005 |
| 6937820 | Optical level control method The present invention relates to an optical level control method for use in an optical transmission system. In the system, a WDM terminal comprises a multiplexing/demultiplexing unit, an amplifier, an up-direction OSC light transmitting/receiving unit, an up-directi... | 08/30/2005 |
| 6909977 | Method for diagnosing degradation in aircraft wiring Wiring in new and older aircraft use bundled insulated conductors that are subject to deterioration overtime that can result in on-board fires, loss of in-flight control and eventual crashes of the aircraft. The present invention provides a diagnostic method which p... | 06/21/2005 |
| 6891995 | Wavelength division multiplex transmission system A first transmitting section frequency-multiplexes a data signal and a monitor signal, and then converts the resultant signal to an optical signal for output. A first receiving section converts the optical signal transmitted via a first optical transmission path and... | 05/10/2005 |
| 6856600 | Method and apparatus for isolating faults in a switching matrix A signal router is described. The signal router includes a switching matrix, an error detector and a controller. The switching matrix includes a first number of inputs and a second number of outputs, and is configured to receive an information stream. The error dete... | 02/15/2005 |
| 6847743 | Polarization scrambler unit and multi-repeater transmission system incorporating the same A polarization scrambler unit includes a plurality of polarization scramblers, a switching unit for coupling one of the polarization scramblers to a transmission line fiber, a detection unit for detecting an output signal from the polarization scrambler coupled to t... | 01/25/2005 |
| 6819875 | Optical wavelength multiplexing transmission apparatus and optical output control method for optical wavelength multiplexing transmission apparatus The present invention provides an optical wavelength multiplexing transmission apparatus and an optical output control method for an optical wavelength multiplexing transmission apparatus in an optical wavelength multiplexing transmission system using a main signal ... | 11/16/2004 |
| 6804469 | Supervisory system of optical amplifier repeater system and supervisory method of optical amplifier repeater system A supervisory system and supervisory method of an optical amplifier repeater are proposed that can implement operation supervision taking account of the characteristics of individual supervisory targets of the optical amplifier repeater, thereby achieving higher rel... | 10/12/2004 |
| 6735390 | Method and apparatus for terminating optical links in an optical network A method and apparatus are disclosed for terminating optical links in an opticalnetwork based on performance requirements. The present invention forces the termination of the received optical signals at each node only on the protection ring and does not force termin... | 05/11/2004 |
| 6005694 | Method and system for detecting optical faults within the optical domain of a fiber communication network A method and system for detecting optical signal degradation or loss within the optical domain of a fiber network. Optical cross-connect switches (OCCS) are provided at network nodes. Optical data traffic is conducted between nodes via a fiber link. The f... | 12/21/1999 |
| 5629789 | Passive optical repeater bypass for optical fiber systems A passive fiber optic repeater bypass is provided which brings fault tolerance to repeatered fiber optic transmission systems. A fiber optic bypass provides an alternate signal path around failed repeaters. The bypass optical attenuation is set to ensure ... | 05/13/1997 |
| 5594581 | Low loss optical transmission/monitoring path selection in redundant equipment terminals An optical line terminal of the type including sets of optical signal processing components arranged in an identical manner in mutually redundant parallel branches includes an input switch that routes an incoming optical signal for processing into either ... | 01/14/1997 |
| 5408348 | System for re-establishing the transmission quality of a link including amplifier equipments in the event of failure of one or more amplifier equipments A system for re-establishing the transmission quality of a digital information transmission link including amplifier equipments in the event of failure of one or more amplifier equipments includes, associated with at least one of the amplifier equipments,... | 04/18/1995 |
| 5109296 | Transmission line switching system A transmission line switching system for switching a transmission line in operation to another transmission line when a fault occurs in the transmission line during operation comprising: a transmission line in operation constituted by a plurality of termi... | 04/28/1992 |
| 5020152 | Fault tolerant-fiber optic coupler/repeater for use in high speed data transmission and the like A fault-tolerant fiber optic coupler/repeater for use in a terminal in a high speed digital, audio or video data transmission system has optical data input from one or a plurality of upstream terminals and sends optical data to one or a plurality of downs... | 05/28/1991 |
| 4837856 | Fault-tolerant fiber optic coupler/repeater for use in high speed data transmission and the like A fault-tolerant fiber optic coupler/repeater for use in a terminal in a high speed digital, audio or video data transmission system has optical data input from one or a plurality of upstream terminals and sends optical data to one or a plurality of downs... | 06/06/1989 |
| 4641372 | Power feeding submarine telecommunications systems An optical undersea telecommunications system has a main cable (1) which branches (BU1) near a landfall to two separate stations. Each branch (71,81) supplies half the current of the main cable (1) for powering the regenerators. In the event of a fault in... | 02/03/1987 |
| 4561120 | Protective relaying system A protective relaying system in which the electric stations at both ends of a district of a power system to be protected optically transmit and receive reciprocally the information of the electric stations. A first protective relay device responds to both... | 12/24/1985 |
| 4112293 | Optical fiber data transmission system A TT coupler for use in fiber optics data transmission systems wherein the incoming light to the coupler passes to both the receiver of the subscriber station and through the coupler lead toward the next subscriber station in succession in a ratio control... | 09/05/1978 |
