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| Number | Title | Issue Date |
| 8155515 | Method and apparatus for sharing common capacity and using different schemes for restoring telecommunications networks A system and method for responding to a failure in a communications network. The failure is detected by a router, which then transmits data from the protection port. A signal is sent from the router to a optical cross-connect system indicating the failure and causin... | 04/10/2012 |
| 8139936 | Method and apparatus of routing convergence in control plane of an intelligent optical network The embodiments of the invention provide a method of routing convergence in a control plane of an intelligent optical network, which includes: a function unit perceiving a service link state transmitting an alarm notification message indicating a failure in a servic... | 03/20/2012 |
| 8121474 | Standby broadband light source for passive optical networks Techniques are disclosed for a broadband service provider to maintain continuity of service in the event that a broadband light source fails in a passive optical network which uses injection-locked transmitters. Generally, a first broadband light source is connected... | 02/21/2012 |
| 8036527 | Apparatus and method for protection switching of optical channel An apparatus and method for protection switching of an optical channel at each node in an optical network based on wavelength division multiplexing optical transmission technology are provided. The method can be applied to any node having at least two optical fiber ... | 10/11/2011 |
| 7831144 | Fast fault notifications of an optical network A method and apparatus for fault notification in an optical network are described herein. In one embodiment, an exemplary process includes detecting at a node that at least a portion of a first unidirectional path of an optical circuit is down, where the first unidi... | 11/09/2010 |
| 7764881 | Optical apparatus and optical cross connect apparatus An optical apparatus is disclosed wherein increase of the number of wavelength selective switches provided for a standby system can be suppressed. The optical apparatus includes a plurality of upstream side optical devices and a plurality of downstream side optical ... | 07/27/2010 |
| 7756416 | Optical communication node and optical network system The present invention relates to prevention of erroneous connection in an optical network and, in particular, it provides an optical communication node having route switching function as well as an optical network system using the same in a wavelength division multi... | 07/13/2010 |
| 7551850 | Highly available redundant optical modules using single network connection A method is disclosed for providing highly available, redundant optical modules using a single network connection in a data processing system. An embedded network interface or network adapter card that occupies one network slot is included and includes a plurality o... | 06/23/2009 |
| 7499646 | Fast fault notifications of an optical network A method and apparatus for fault notification in an optical network are described herein. In one embodiment, an exemplary process includes detecting at a node that at least a portion of a first unidirectional path of an optical circuit is down, where the first unidi... | 03/03/2009 |
| 7474850 | Reroutable protection schemes of an optical network Reroutable protection schemes of an optical network are described herein. In one embodiment, an access node detects that at least a portion of a first path of an optical circuit fails based on a loss of a light of the at least a portion of the first path. In respons... | 01/06/2009 |
| 7447428 | Method and device for data-flow protection of optical interface in data communication equipment The invention discloses a method and device for data-flow protection of an optical interface in data communication equipment. First, receiving an optical-signal from a source-neighboring device, then duplicating the received optical signal into two duplicated optica... | 11/04/2008 |
| 7443843 | Terminal relay device and relay method An apparatus has a cross connection circuit, first switching sections located on the input side of the cross connection circuit to switch a presently-used transmission path and a reserve transmission path, and second switching sections located on the output side of ... | 10/28/2008 |
| 7440395 | Telecommunication switch and operating method A telecommunication switch and an operating method for handling SDH signals transmitted by a protection SDH link associated to a working SDH link of an SDH hardware interface of the telecommunication switch. The telecommunication switch comprises a plurality of SDH ... | 10/21/2008 |
| 7436763 | Data communication apparatus with a dual mode protection switching system A data communication apparatus having a plurality of working ports for exchanging data traffic with a network element and at least one protection port. The communication apparatus also has a protection switching functional element to switch data traffic from a faile... | 10/14/2008 |
| 7436761 | Apparatus and method for connecting fibre channel devices via bypass buffers Apparatus is disclosed for connecting at least a first Fibre Channel device to at least a second Fibre Channel device. The apparatus includes ports, buffers and bypass buffers that are arranged so that the second Fibre Channel device can operate at a physical link r... | 10/14/2008 |
| 7415205 | Wavelength division multiplexed self-healing passive optical network using wavelength injection method A wavelength division multiplexed self-healing passive optical network using a wavelength injection method includes a central office for coupling modulated multiplexed optical signals (MMOS) and broadband optical signals (BOS)for an upstream light source into one si... | 08/19/2008 |
| 7411726 | Multi-channel differentially encoded phase shift keyed receivers An optical, multi-channel, Differential Phase Shift Keying (DPSK) receiver demodulates multiple Wavelength Division Multiplexed (WDM) channels using at least one interferometer. This distributes expense of the interferometer(s) over all channels of an optical signal... | 08/12/2008 |
| 7400829 | Transmission apparatus and path selection method of a transmission apparatus A transmission apparatus that receives an optical signal by selecting any one of a plurality of provided optical signal transmission paths through protection control is configured to include a plurality of optical signal outputting sections that output the optical s... | 07/15/2008 |
| 7382722 | Architecture for a hybrid STM/ATM add-drop multiplexer A network element including an active/standby pair of line units, an active/standby pair of switch fabric units, at least one service unit, and a management and control unit. Each line unit maintains data communications using a first communications protocol. Each sw... | 06/03/2008 |
| 7372804 | Multiplex communication system and method Disclosed are the multiplex communication system and the method therefore. A fault detection part of a duplex switching device detects it as generation of fault when recognizable signals are not detected from a connected line within a prescribed time. When the fault... | 05/13/2008 |
| 7372803 | Apparatus and method for establishment and protection of connections within mesh networks A node within a mesh network includes an Optical Connection Controller (OCC) and a network element. When a connection path within the mesh network is required, an OCC determines if a particular connection path requires a network element to operate as a virtual gatew... | 05/13/2008 |
| 7369769 | Ethernet passive optical network ring and its method of authorization and collision detection An Ethernet passive optical network (EPON) ring for providing protection against fiber failures. The optical network unit (ONU) is coupled to the ring fiber by a three-port passive optical splitting module that has three two-way optical passages. By the three two-wa... | 05/06/2008 |
| 7366413 | Modular cross connect system with 3D-MEMS for optical telecommunication networks A modular cross connect system for optical telecommunication networks has the optical unit divided in at least two main bodies with one section for connection comprising the collimators and a main commutation section with MEMS devices. The first section is a fixed p... | 04/29/2008 |
| 7359331 | Alarm transfer method and wide area Ethernet network An alarm transfer method for use in a wide area Ethernet network has the steps of generating a plurality of fixed-length frames from an Ethernet frame sent from a client terminal, generating capsules each comprised of each of the fixed-length frames, a type field fo... | 04/15/2008 |
| 7356259 | Optical bypass upgrade configuration Optical bypass node upgrade configurations are disclosed: (1) a configuration where optical taps are pre-positioned in wavelength division multiplex (WDM) line systems terminating at optical-electrical-optical (OEO) core switching nodes to allow for future upgrade o... | 04/08/2008 |
| 7352966 | Method and apparatus for capacity-efficient restoration in an optical communication system A method and system provide capacity-efficient restoration within an optical fiber communication system. The system includes a plurality of nodes each interconnected by optical fibers. Each optical fiber connection between nodes includes at least three channel group... | 04/01/2008 |
| 7310683 | Message relaying scheme based on switching in units of flows A message relay device suitable for contructing a ultra-high-speed message relaying system is disclosed. In the message relay device, a flow is detected by a prescribed condition, while a bypass channel capable of transferring messages with an amount of calculations... | 12/18/2007 |
| 7302190 | Optical communication system including replaceable electro-optic and opto-electric converters In an optical transmitting or receiving apparatus, a plurality of replaceable electro-optic converters or a plurality of replaceable opto-electric converters are provided in correspondence with optical transmission lines. ... | 11/27/2007 |
| 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 |
| 7296106 | Centerplaneless computer system A computer system which may allow a centerplaneless design. The computer system may include various client circuit boards including processor circuit boards, memory circuit boards and switch circuit boards. The processor circuit boards may each include at least one ... | 11/13/2007 |
| 7289429 | System and method to perform non-service effecting bandwidth reservation using a reservation signaling protocol A method to facilitate recovery of a node in a communications network is disclosed. The method comprises receiving one or more messages from at least another node in the communications network and restoring connectivity of a recovering node based at least in part on... | 10/30/2007 |
| 7283740 | Optical ring network with optical subnets and method An optical network includes a plurality of subnets. The subnets each include a plurality of add/drop nodes coupled to the optical ring and operable to passively add and drop traffic to and from the optical ring. The network further includes a plurality of gateway no... | 10/16/2007 |
| 7283748 | Self-healing wavelength division multiplexing-passive optical network system A self-healing WDM (Wavelength Division Multiplexing)-PON (Passive Optical Network) system is disclosed and includes a CO (Central Office), a RN (Remote Node) and a plurality of subscriber units. The system includes a trunk working fiber and a trunk protection fiber... | 10/16/2007 |
| 7260325 | Network component for an optical network comprising an emergency operation function, especially for an optical network in ring topology A network component (3d) for an optical network (1) is described, including a coupling device (2; 4, 5) for optical coupling of the network component (3d) to the optical network (1), the coupling device (2; 4, 5 | 08/21/2007 |
| 7260059 | Evolution of a telecommunications network from ring to mesh structure Ongoing growth in transport demand is served while deferring or eliminating expenditure for additional capacity by reclaiming the protection capacity and inefficiently used working capacity in existing multi-ring network. Reclamation is through re-design of the rout... | 08/21/2007 |
| 7233430 | Multi-channel DPSK receiver An optical, multi-channel, Differential Phase Shift Keying (DPSK) receiver demodulates multiple Wavelength Division Multiplexed (WDM) channels using a single interferometer. This distributes expense of the interferometer over all channels of an optical signal, allow... | 06/19/2007 |
| 7233738 | Protection switching architecture and method of use A protection switching architecture is used in a telecommunications system such as a wavelength division multiplexed (WDM) telecommunications system to replace a failed transmission line or a failed wavelength processing device. A spare wavelength processing device ... | 06/19/2007 |
| 7212738 | Preventing signal loss in an optical communications network A redundant optical signal transmission and reception system enables information exchange via an optical communications network without data loss in the event of optical transmitter or receiver failure. In one embodiment, the redundant optical signal system includes... | 05/01/2007 |
| 7212541 | Wavelength division multiplexed (WDM) ring passive optical network (PON) with route protection for replacement of splitter based passive optical networks A method and apparatus for low cost upgrading on demand of an optical fiber communication system without installing additional optical fiber and minimal installation of optical circuitry at destination and distribution terminals. The upgraded systems comprise an opt... | 05/01/2007 |
| 7206508 | Method and apparatus for operation, protection, and restoration of heterogeneous optical communication networks Techniques for providing normal operation and service restoration capability in the event of failure of terminal equipment or transmission media in a heterogeneous network, such as a hybrid network containing single- and multi-wavelength lightwave communications sys... | 04/17/2007 |
