Patent application number | Description | Published |
20090208210 | PASSIVE OPTICAL NETWORK REMOTE PROTOCOL TERMINATION - A system, method, and node for extending the reach of a fiber-based access network. A Remote Protocol Termination (RPT) is implemented remotely from a central office Optical Line Termination (OLT). The RPT receives a data signal transmitted by a user's Optical Network Unit/Termination (ONU/T) over a Passive Optical Network (PON) utilizing a PON protocol or Wavelength Division Multiplexing (WDM)_based protocol, and converts the signal to a long-reach transport protocol. The RPT then transmits the data signal to the central office OLT utilizing the long-reach transport protocol. The RPT also performs this protocol conversion in the opposite direction for signals transmitted from the central office OLT to the ONU/T. | 08-20-2009 |
20100284425 | SYSTEM AND METHOD OF USING TDM VARIABLE FRAME LENGTHS IN A TELECOMMUNICATIONS NETWORK - A system, method, and node for efficiently packing payload of variable or arbitrary frame lengths into a TDM telecommunications system transmission. A transmitting unit transmits a plurality of frames whose concatenation does not precisely fit into the interval between TDM framing synchronization patterns to a receiving unit. An offset value is determined, which specifies the consequent delay in transmission of a TDM framing synchronization pattern. The offset value is then sent to the receiving unit in conjunction with the TDM framing signal. The receiving unit receives the plurality of frames and the offset value and reconstructs a precise reference instant derived from the offset value. By reconstructing the precise interval boundary, the receiving unit remains synchronized with the transmitting unit. | 11-11-2010 |
20120039602 | Method and Apparatus for Detecting Rogue Optical Network Unit in Passive Optical Network - A method performed in an optical line terminal (OLT) in a passive optical network (PON) for detecting a rogue optical network unit (ONU) operating among a plurality of ONUs in the PON. The OLT receives a plurality of bursts of light from a plurality of ONUs, each burst being separated from other bursts by an inter-burst gap containing a minimum dark interval during which the OLT expects to receive no optical power. The OLT measures the received optical power during one or more of the minimum dark intervals of the inter-burst gaps and determines whether the inter-burst gaps were anomalous. In response to determining that an inter-burst gap was anomalous, the OLT increments an anomaly count that indicates a rogue ONU has been detected when the anomaly count exceeds an anomaly count threshold. When the anomaly count is exceeded, the OLT declares an alarm associated with the presence of a rogue ONU, and may also initiate rogue isolation diagnostics. | 02-16-2012 |
20120045201 | MONITORING ENERGY CONSUMPTION IN OPTICAL ACCESS NETWORKS - An optical access network ( | 02-23-2012 |
20120099814 | UPSTREAM FIBER OPTIC COUPLERS AND METHODS FOR POWER SPLITTING PASSIVE OPTICAL NETWORKS - A fiber optic coupler includes a housing that receives upstream optical signals from drop optical fibers that are optically coupled to optical network units in a power splitting passive optical network and provides an aggregate upstream optical signal to a trunk optical fiber that is optically coupled to an optical line terminal in the power splitting passive optical network, without having passed through a power splitter. At least one reflector and/or refractor in the housing is oriented to reflect and/or refract at least one upstream optical signal from at least one of the drop optical fibers, so as to produce the aggregate upstream optical signal for the trunk optical fiber. Various configurations of reflectors and/or refractors may be provided. Relative methods are also disclosed. | 04-26-2012 |
20120166819 | Power Management of Optical Access Networks - Power management is performed in an optical access network to reduce energy consumption. Service information is determined about traffic at the first node. Power management is controlled based on the determined service information. The first node can control power management at the first node and/or the second node. The first node can categorize traffic according to service and determine traffic activity per service. Service information can include service type of the traffic, traffic class of the traffic, and/or quality of service requirements of the traffic. | 06-28-2012 |
20120243871 | ONU WITH WIRELESS CONNECTIVITY CAPABILITY - The embodiments herein relate to a method in an optical network unit ( | 09-27-2012 |
20120294613 | METHOD FOR ONU REGISTRATION IN A PASSIVE OPTICAL NETWORK - Embodiments of the invention include a system for registering an optical network unit (ONU) installed in a passive optical network (PON), including a mobile terminal, a registration server, and an optical line terminal (OLT). The mobile terminal is configured to collect an ONU identification from the ONU, collect a subscriber identification, and transmit the ONU identification and the subscriber identification to a registration server via a communication system. The registration server is configured to receive the ONU identification and subscriber identification from the mobile terminal via the communication system, retrieve subscriber information from a subscriber database based on the subscriber identification, associate the ONU with the subscriber information, and transmit, to an optical line terminal, an association between the ONU and the subscriber information. The optical line terminal (OLT) is configured to serve as an endpoint for the ONU in the PON. | 11-22-2012 |
20120315040 | METHOD FOR FAST WAVELENGTH DIVISION MULTIPLEXING (WDM) PASSIVE OPTICAL NETWORK (PON) INITIALIZATION IN HETEROGENEOUS NETWORKS - A method provides advertisements to optical network units (ONUs) by an optical line terminal (OLT), wherein the advertisements enable the ONUs to identify free channels from a plurality of wavelength-division multiplexing (WDM) channels in a passive optical network (PON). The method includes: transmitting from the OLT to the ONUs an advertisement identifying a free channel for each of a plurality of incompatible channel (ICH) groups, receiving a request from an ONU for the advertised free channel of an ICH group, authenticating the requesting ONU via the advertised free channel, allocating the advertised free channel to the requesting ONU upon successful authentication of the requesting ONU, and transmitting an updated advertisement from the OLT to the ONUs. | 12-13-2012 |
20130064539 | Transparent Overhead In a Passive Optical Network that Supports Enhanced Features - A Gigabit-capable Passive Optical Network (GPON), including an enhanced Optical Line Termination (OLT) and Optical Network Units (ONUs), provides enhanced features, e.g., features defined in XG-PON. One or more of the ONUs are enhanced ONUs. The enhanced OLT communicates with the ONUs via downstream frames and upstream bursts, each downstream frame and upstream burst being compliant with a GPON framing format. The enhanced OLT transmits downstream frames to the ONUs, the downstream frames including downstream sub-frames with at least one downstream sub-frame being an overhead sub-frame that includes information of the enhanced features. The enhanced OLT receives upstream bursts from the ONUs, the upstream bursts including upstream sub-frames, each upstream sub-frame including an upstream identifier field that indicates to the enhanced OLT whether the upstream sub-frame is an overhead sub-frame. The enhanced OLT and the enhanced ONUs perform network operations to provide the enhanced features specified in the overhead sub-frame. | 03-14-2013 |
20130089316 | METHOD AND ARRANGEMENTS FOR PROTECTION IN AN OPTICAL NETWORK - Method and arrangement for protecting optical network systems, the arrangement ( | 04-11-2013 |
20130183039 | SELECTABLE MULTIPLE-WAVELENGTH ACCESS FOR OPTICAL NETWORK UNITS IN ARRAYED WAVEGUIDE BASED WAVELENGTH DIVISION MULTIPLEXING PASSIVE OPTICAL NETWORK - An optical network unit (ONU) accesses services provided by multiple optical line terminals (OLTs) in a wavelength division multiplexing (WDM) passive optical network (PON). The ONU receives downstream signals from a first plurality of OLTs through a designated port of an arrayed waveguide (AWG). At any given time, the bandpass filter module can select any one of a first plurality of AWG cycles allocated to the first plurality of OLTs. Based on received downstream signals, the ONU transmits upstream signals to a second plurality of OLTs through the designated port of the AWG. At any given time, the bandpass filter module and a transmitter of the ONU can select any one of a second plurality of AWG cycles allocated to the second plurality of OLTs. The ONU may be configured with a plurality of receivers and transmitters, whereby it is enabled to simultaneously subscribe to a plurality of AWG cycles. | 07-18-2013 |
20130343701 | UPSTREAM FIBER OPTIC COUPLERS AND METHODS FOR POWER SPLITTING PASSIVE OPTICAL NETWORKS - A fiber optic coupler includes a housing that receives upstream optical signals from drop optical fibers that are optically coupled to optical network units in a power splitting passive optical network and provides an aggregate upstream optical signal to a trunk optical fiber that is optically coupled to an optical line terminal in the power splitting passive optical network, without having passed through a power splitter. At least one reflector and/or refractor in the housing is oriented to reflect and/or refract at least one upstream optical signal from at least one of the drop optical fibers, so as to produce the aggregate upstream optical signal for the trunk optical fiber. Various configurations of reflectors and/or refractors may be provided. Relative methods are also disclosed. | 12-26-2013 |
20140093232 | Method for protection of multi-wavelength passive optical network - An Optical Line Termination (OLT) system in a multi-wavelength Passive Optical Network (PON) includes a protection port for protecting a set of OLT ports without the use of a physical switch. The protection port has a tunable transceiver. The OLT system detects a failure of one of the OLT ports, which was originally adapted to transmit downstream traffic to a subset of ONUs on a downstream wavelength and to receive upstream traffic from the subset of ONUs on an upstream wavelength. In response to the detection, the OLT system tunes the protection port to the downstream wavelength for transmission and to the upstream wavelength for reception, and resumes communication between the OLT system and the subset of ONUs through the protection port instead of the OLT port. | 04-03-2014 |
20140112662 | MONITORING ENERGY CONSUMPTION IN OPTICAL ACCESS NETWORKS - An optical access network comprises optical network units connected to a node. A monitoring unit determines information indicative of energy consumption at the optical network unit over a period of time. An optical network unit can operate in operating states/modes which differ in their energy consumption. Monitoring unit can determine the information by determining a time that an optical network unit spends in the different operating states/modes. Monitoring unit can use a state machine at the node which represents the optical network unit. An optical network unit can locally record time spent in states/modes and forward this to the monitoring unit. An optical network unit can locally monitor energy consumption and forward this to the monitoring unit. An operational parameters of the access network can be modified based on the information determined by the monitoring unit. | 04-24-2014 |
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 |
20140255027 | ENERGY CONSERVATION BY MEANS OF TRAFFIC SHAPING - A method executed by an optical line terminal (OLT) in a passive optical network (PON). The PON includes a plurality of optical network units (ONUs) coupled with the OLT through an optical fiber, the ONUs sharing a bandwidth of the optical fiber. The method includes receiving, from the ONU, an energy conservation message indicating support for the reduced buffer memory size. The reduced buffer memory size is calculated based on the maximum committed transmission rate and the burst size limit for the downstream traffic intended for the ONU. A notification is transmitted to the ONU indicating that a portion of the buffer memory can be powered down such that only the reduced size of the buffer memory remains in operation, and downstream traffic intended for the ONU is transmitted at an average transmission rate and burst size not exceeding the maximum committed transmission rate and the burst size limit. | 09-11-2014 |
20140260638 | AUTOMATED FAULT LOCALIZATION IN PIPELINES AND ELECTRICAL POWER TRANSMISSION LINES - Methods and apparatus for determining an estimated physical location of a fault in a pipeline or electrical transmission line using localization devices coupled thereto. In an embodiment, a first and second localization device each generate time values representing times when the respective localization device detected the fault. The estimated fault location is calculated, by one of the localization devices or a separate computing device, based upon the reported time values. In some embodiments, the calculation is further based upon characteristics of the pipeline or electrical transmission line, or based upon characteristics of matter transported through the pipeline. In some embodiments, the localization devices transmit time or sequence values to the other device, and the values received by the devices just before the detection of the fault may additionally be utilized to calculate the estimated physical location of the fault. | 09-18-2014 |
20150055947 | METHOD FOR QUICK AUTOMATIC REMOTE WAVELENGTH DISCOVERY AND CONFIGURATION - A remote node, e.g., a client-side node or a service-side node, writes wavelength information into an overhead message of a packet carried by an optical signal when an optical port associated with the remote node is deployed. The overhead message explicitly identifies the wavelength channel associated with the newly deployed optical port to a hub node in a WDM optical network. The hub node identifies the new wavelength channel associated with the newly deployed optical port based on the overhead message to enable the hub node to associate the new wavelength channel with the newly deployed optical port. | 02-26-2015 |