Patent application number | Description | Published |
20110200328 | SCHEDULING DEVICE - A control device ( | 08-18-2011 |
20110236017 | Methods and Devices for Wavelength Alignment in WDM-PON - An optical network unit for a passive optical network ( | 09-29-2011 |
20120008958 | METHOD AND DEVICES FOR AUTOMATIC TUNING IN WDP-PON - A system and method in a wavelength division multiplexing passive optical network is provided. A multiplexed optical downstream signal is transmitted from an optical line terminal to a passive distribution node. The signal is demultiplexed into a plurality of optical sub-signals. A sub-signal is transferred to an optical network termination. The received at least one sub-signal is identified. An optical wavelength of an upstream optical signal is set as a function of a predefined relationship between an optical wavelength of the received at least one sub-signal and the optical wavelength of the upstream signal. The upstream signal is transmitted to the optical line terminal via the passive distribution node. | 01-12-2012 |
20120230678 | OVERHEAD ADJUSTMENT SCHEME FOR PASSIVE OPTICAL NETWORKS - Embodiments of the present invention relate system and method for handling large dynamical signals in a passive optical network system and in particular for determining scheduling of bursts from a plurality of optical network units. More particularly, embodiments of the present invention relate to a system and method for determining a bit error ratio, i.e. BER in received communication data, determining, using the BER, optimized transmission scheduling of communication bursts from the optical network units, and providing a signal to the optical network units indicating the transmission scheduling of transmission bursts in accordance with the determined optimized transmission scheduling. | 09-13-2012 |
20120314799 | METHOD AND APPARATUS PROVIDING PROTECTION AND DC BALANCE IN A COMMUNICATION SYSTEM - A method and apparatus for controlling DC balance in a digital communication system in which data frames are transmitted, wherein the data frames include a header portion that is transmitted unscrambled and a payload portion that is scrambled before transmission. The header portion includes a frame counter field. A value for the frame counter field is randomly generated and an effect on the DC balance is estimated. It is then determined whether the estimated effect on the DC balance meets defined requirements for DC balance. When the estimated effect does not meet the defined requirements for DC balance, a new random value for the frame counter field is generated and checked. When the estimated effect meets the requirements, the randomly generated value is utilized in the frame counter field in transmitted data frames. | 12-13-2012 |
20130089322 | Method And Apparatus For Changing A Mode In An Optical Network - A method at a transmitter of a tunable laser of controlling a mode change of the laser during a transmission of data to a receiver of a terminating node is based on the determination of a time instance for initiation of the mode change on the basis of the state of the tunable laser. In addition, buffer occupancy and/or the state of the data transmission may be considered when determining such a time instance for instance. In addition, data of the data transmission is buffered during the mode change, such that data loss is avoided during the change of mode. A transmitter is also provided which can execute the suggested mode changing method. | 04-11-2013 |
20130336653 | METHODS AND APPARATUS FOR A PASSIVE ACCESS SUBNETWORK - An access subnetwork node herein comprises one or more add-drop modules, each module including one or more passive optical filters. The one or more add-drop modules are configured to selectively drop a fixed band of wavelength channels from an access subnetwork, via a passive directional coupler, to each of multiple client nodes that actively select to receive client-specific channels within the fixed band. The one or more add-drop modules are also configured to selectively add the fixed band of wavelength channels to the access subnetwork, as received via a passive directional coupler from the multiple client nodes that actively select to transmit client-specific channels within the fixed band. With an access subnetwork node and a client node configured in this way, embodiments herein reduce the complexity and accompanying cost of nodes in an optical network, while also maintaining flexibility for assigning wavelength channels in the network. | 12-19-2013 |
20140133844 | SEQUENCE-BASED LINK FAULT LOCALIZATION - Methods and apparatus for a network element or server end station to determine an estimated physical location of a fault in a communications link utilized by two network elements. In an embodiment, the first and second network elements generate link failure indications including time values representing when the respective network element detected the fault. In other embodiments, the link failure indications include time values transmitted over the communications link between the first and second network elements. A time distance between these time values is calculated, which is used to calculate the estimated physical location of the fault. In some embodiments, the link failure indications include sequence numbers transmitted or about to be transmitted over the communications link between the network elements. Sequence distances are calculated between the sequence numbers, and are used to calculate the estimated physical location of the fault. | 05-15-2014 |
20140133845 | TIME-BASED LINK FAULT LOCALIZATION - Methods and apparatus for a network element or server end station to determine an estimated physical location of a fault in a communications link utilized by two network elements. In an embodiment, the first and second network elements generate link failure indications including time values representing when the respective network element detected the fault. In other embodiments, the link failure indications include time values transmitted over the communications link between the first and second network elements. A time distance between these time values is calculated, which is used to calculate the estimated physical location of the fault. In some embodiments, the link failure indications include sequence numbers transmitted or about to be transmitted over the communications link between the network elements. Sequence distances are calculated between the sequence numbers, and are used to calculate the estimated physical location of the fault. | 05-15-2014 |
20140193161 | Enabling Communication Between Two End Terminals in a Fibre Optic Network - A first end terminal and a second end terminal, as well as a respective method therein, are provided for enabling communication between the first end terminal and the second end terminal in a fibre optic access network. When the first and the second end terminal wish to communicate with each other, they first initiate a synchronisation procedure with the other end terminal for synchronising the two terminals with each other and enabling them to start a negotiation procedure. Then they perform the negotiation procedure, which pertains to a transmission rate for communication on the fibre link between the two end terminals, and they execute communication to the other end terminal employing the negotiated transmission rate. | 07-10-2014 |
20140199062 | Protection for Fibre Optic Access Networks - An Optical Network Unit, ONU, and an Optical Line Terminal, OLT, as well as a respective method therein, are provided for enabling the ONU to communicate with the OLT. The ONU and at least one OLT are comprised in a passive fibre optic access network. The passive fibre optic access network comprises two fibre paths through the network, a main fibre path and a back-up fibre path, connecting the ONU with the OLT. When a fault is detected in the main fibre path is detected, transmission rate negotiation is performed between the ONU and the OLT over the back-up path. When a transmission rate is agreed upon between the ONU and the OLT during said transmission rate negotiation with regard to communication over the back-up path, the communication between the ONU and the OLT is executed using the agreed transmission rate over the back-up path. | 07-17-2014 |