392 results about "Pons" patented technology

A method includes provisioning joint bandwidth in a software defined passive optical network PON based mobile backhaul MBH and cache management on base stations for video delivery across the network, the provisioning in each time unit includes grouping bandwidth utilization in the network into a first category used to support video requests which cannot directly be served by caches on base stations, the first category video requests being high priority, and if bandwidth remains after the high priority requests remaining bandwidth being used to deliver some videos that are low priority to caches.

An improved polygraph method of achieving real time determination of the veracity of an individual by direct observation of synaptic activity via medical imaging, such as provided by Positron Emission Tomography or Functional Magnetic Resonance. Given situations where non factual statements are made by a given test subject, higher order brain functions which affect secondary and tertiary functions and autonomic activity in the Cerebellum, Pons, and Medulla Oblongata, offer significant and observable synaptic action when juxtaposed with similar reference conditions where the individual is truthful. The disclosed invention eliminates error prone interpretation of conventional polygraph results, which relay on heart rate, blood pressure, skin conductance, respiration rate, voice stress, and body motion or expressions, thus offering a significantly improved means of determining truthful cooperation of a given subject.

The invention discloses a method for pre-configuration management of an ONU (optical network unit) by an OLT (optical line terminal). The method includes establishing a virtual ONU, and loading management data structure of the virtual ONU; pre-configuring the virtual ONU and storing pre-configuration information of the virtual ONU; and when a real ONU goes online, issuing the pre-configuration information in batch for the real ONU. The invention further discloses a device for pre-configuration management of the ONU by the OLT. The device comprises an ONU virtual configuration module, an ONU virtual configuration storage module and an ONU remote communication module. Inconvenience in management and maintenance caused by configuration differentiation due to a large number of ONUs in a PON (passive optical network) is overcome by a pre-configuration method. The method and the device are simple to implement and efficient and can be used for all OLT devices.

A method for detecting faults and their locations in an optical path between an optical line terminal (OLT) of and optical network units (ONUs) of a passive optical network (PON). The method comprises forming a maintenance optical link through the PON between the OLT and a collocated ONU, the OLT and its collocated ONU are each connected to an optical splitter; sending a ranging request from the OLT to the collocated ONU; in response to the ranging request, receiving, over the maintenance optical line, a ranging burst signal including at least a fault analysis detection pattern (FADP); and analyzing the FADP in the received signal by auto-correlating the FADP signal with an expected FADP signal, an uncorrelated event measured through the auto-correlation is indicative of a fault in the optical path of the PON and occurrence times of such events are indicative of the fault's location in the optical path.

In a communication system using a PON, time synchronization of a slave device such as a base station is realized with respect to a master device such as an L2SW or the base station. Time information acquired by a GPS satellite is corrected by ranging information of a discovery function of an OLT so as to be reflected on time information of each ONU. A propagation delay from the L2SW to the OLT is obtained with the use of a delay estimation mechanism, a propagation delay from the OLT to the ONU which is obtained by ranging is added to obtain a propagation delay from the L2SW to the ONU. The obtained propagation delay from the L2SW to the ONU is added to the transmitted time stamp value whereby a time stamp value received at a base station or femtocell side becomes a time into which the propagation delay to the ONU is incorporated, and absolute values of clock timers can be synchronized with each other. The addition process can be realized by rewriting the time stamp value of the packet within the OLT or the ONU.

The invention discloses a fault detection method and system for a multi-branch PON (Passive Optical Network), comprising a network fault detection device, a WDM (Wavelength Division Multiplexer) and a light splitting device. The network fault detection device is arranged at one OLT (Optical Line Terminal) side and used for emitting detection light and transmitting the detection light to the WDM; a detection light echo signal, the wavelength of which is the central detection wavelength of branch filters of an ONU (Optical Network Unit) to be detected, is received for fault analysis; the WDM is arranged at the OLT side and used for coupling the detection light into the multi-branch PON and transmitting the detection light to the light splitting device through a trunk fiber; the light splitting device comprises a light splitter and a plurality of branch filters respectively mounted on all ONU branches, the central detection wavelengths of all branch filters in the same light splitting device are different from one another, and the central detection wavelength of a certain branch filter is the wavelength of the detection light capable of being filtered by the branch filter. The fault detection method and system provided by the invention are simple and low in cost, and effectively realize the fault detection of the multi-branch PON.

The invention discloses a method, equipment and a system for diagnosing a failure of a passive optical network (PON). The method comprises the steps of: pre-obtaining identification information of each ONU (Optical Network Unit) in the PON, optical fiber link physical distance and the corresponding peak information of the ONU when the PON is normal; establishing a correspondence table of the identification information and the corresponding peak information of each ONU according to the obtained identification information and the physical distance parameter information of each ONU and the optical fiber link physical distance and the corresponding peak information of the ONU; obtaining corresponding peak information of optical fiber links of all current ONUs in the PON according to the preset failure diagnosis measure; matching the corresponding peak information of the current optical fiber link with the pre-stored leak information, and if corresponding peak position and / or amplitude changes, obtaining the identification information of the ONU corresponding to the changed peak according to the correspondence table; and if not, executing the equipment failure diagnosis. By applying the invention, the failure position can be immediately found and positioned, the failure maintenance time is shortened and the failure detection efficiency is improved.

The TWDM-PON system includes a service provider equipment configured to comprise a plurality of Optical Line Terminals (OLTs), wherein each OLT provides a service in a TWDM scheme; a subscriber equipment configured to comprise a plurality of an Optical Network Units (ONUs), wherein each of the plurality of ONUs utilizes a service provided from one of the plurality of OLTs using an optical signal of an arbitrary wavelength; an Optical Division Network (ODN) configured to transmit multi-wavelength downstream optical signals and multi-wavelength upstream optical signals; and a Reach Extender (RE) configured to comprise at least one of a downstream optical amplifier and an upstream optical amplifier, wherein the downstream optical amplifier is configured to amplify the multi-wavelength optical signals simultaneously, and the upstream optical amplifier is configured to amplify the multi-wavelength optical signals simultaneously.

A link setup method for a wavelength-division-multiplexing passive optical network (WDM PON) system. The system includes a service providing device, a local node, and a plurality of subscriber devices. The link setup method includes assigning an initial wavelength for communication between the service providing device and a new subscriber device to be installed in the local node. The assigning of the initial wavelength may be performed as a part of process for activating the subscriber device, and this procedure may be performed between a physical layer of the service providing device and a physical layer of the new subscriber device.

Operations, administration and management (OAM) functions in a passive optical network (PON) can be performed by providing a system of flow points (i.e., software entities), such as those along the lines of the Maintenance End Points (MEPs) and Maintenance Intermediate Points (MIPs) described in the IEEE 801.1ag specification, which communicate connectivity fault test messages with each other. The flow points can be provided in the Optical Line Terminal (OLT) and Optical Network Terminator (ONT). Alternatively or in addition, flow points can be provided in a subscriber gateway coupled to the ONT. The flow points issue test messages, to which other flow points can respond with information regarding the state of network connectivity.

An optical line terminal (OLT) coupled to a plurality of optical network units (ONUs) through a passive optical network (PON). The OLT includes a transceiver configured to communicate via a management channel of a communication network with a plurality of OLTs. The communication includes sending or receiving a notification, wherein the notification includes the following: a source OLT identifier associated with a source OLT sending the notification, wherein the source OLT is configured to communicate over a first channel at a first wavelength of the PON; a destination OLT identifier associated with a destination OLT receiving the notification, wherein the destination OLT is configured to communicate over a second channel at a second wavelength of the PON; and an ONU identifier associated with a first ONU associated with the notification.

Novel tools and techniques are provided for implementing point-to-point fiber insertion within a passive optical network (“PON”) communications system. The PON communications system, associated with a first service provider or a first service, might include an F1 line(s) routed from a central office or DSLAM to a fiber distribution hub (“FDH”) located within a block or neighborhood of customer premises, via at least an apical conduit source slot, an F2 line(s) routed via various apical conduit components to a network access point (“NAP”) servicing customer premises, and an F3 line(s) distributed, at the NAP and from the F2 line(s), to a network interface device or optical network terminal at each customer premises via various apical conduit components (e.g., in roadway surfaces). Point-to-point fiber insertion of another F1 line(s), associated with a second service provider or a second service, at either the NAP or the FDH (or outside these devices).

In a Wavelength-Division-Multiplexed Passive Optical Network (WDM-PON) utilizing a conventional downstream optical signal reusing method, there is an inventory problem that different optical transmitter types need to be provided for the operation, management, replacement, etc. of a system. A WDM-PON system according to the present invention, includes: a seed light (SL) unit generating a seed light whose wavelength intervals and center wavelengths are adjusted using at least one seed light source; an optical line terminal (OLT) receiving the wavelength-multiplexed seed light from the seed light unit, transmitting a downstream optical signal to a subscriber of the WDM-PON, and receiving a upstream optical signal from the subscriber; and an optical network unit (ONU) receiving the downstream optical signal from the OLT, flattening and modulating the downstream optical signal with upstream data so that the downstream optical signal is reused for carrying upstream data. It is possible to improve the quality and reliability of downstream transmission by sufficiently increasing an extinction ratio, and improve the quality and reliability of upstream transmission by sufficiently flattening an input downstream optical signal in a semiconductor optical amplifier.

The embodiment of the invention discloses a device for detecting optical power of a passive optical network (PON). The device comprises a receiving module, a detection module and a controller, wherein the receiving module is used for receiving optical signals sent by an optical network unit (ONU); the detection module comprises a current mirror received signal strength indication (RSSI) detection branch and a logarithmic amplifier RSSI detection branch; the current mirror RSSI detection branch and the logarithmic amplifier RSSI detection branch are respectively coupled with the receiving module and used for carrying out RSSI measurement on the optical signals received by the receiving module in accordance with received RSSI function trigger signals; and the controller is coupled with the detection module and used for outputting the RSSI function trigger signals to the detection module, selectively receiving RSSI measurement results which are output by the RSSI detection branch and correspond to the luminous intensity of the optical signals sent by the ONU according to the selection control signals provided by a selection control signal generating module, and calculating the optical power information of the optical signals in accordance with the RSSI measurement results. The embodiment of the invention also discloses a method for detecting optical power of a PON and a PON system.

The present invention discloses methods for reducing power consumption in a PON while maintaining service continuity, the method including the steps of: providing an OLT operationally connected to at least one ONU; triggering a sleep request for at least one requesting ONU; upon receiving a sleep acknowledgement, activating a sleep mode for at least one requesting ONU according to a sleep period designated in the sleep request; and terminating the sleep mode according to the sleep period. Preferably, the sleep acknowledgement is transmitted from the OLT to the requesting ONU. Preferably, the sleep period is executed by a sleep command in the sleep acknowledgement. Preferably, the method further includes the step of: upon completion of the sleep period, transmitting buffered data traffic from the OLT to a sleeping ONU. Preferably, the step of transmitting is performed without the sleeping ONU being re-registered and without causing packet reordering.

A label switching method is provided. When a Passive Optical Network (PON)-based Label Switching Path (LSP) is established, a PON logical service transmission channel is established between an Optical Line Terminal (OLT) and an Optical Network Unit (ONU). According to an identifier (ID) of the PON logical service transmission channel as a PON label, a PON-based Forwarding Information Base (FIB) table on the ONU is updated, and a PON-based Label Forwarding Information Base (LFIB) table on the OLT is updated, where the PON-based LFIB table records a forwarding relationship between an ingress port plus an ingress label and an egress port plus an egress label, and the PON-based FIB table records a forwarding relationship between the ingress port plus a destination address and the egress port plus the egress label. Therefore, the problems between network segments of different forwarding characteristics, protocol variation, inter-segment conversion, and mapping and control complexity are avoided.

The invention discloses a technical scheme for PON (passive optical network) network fault detection and positioning and relates to a PON technology. The method comprises the following steps: acquiring data of optical modules of OLT (optical line terminal) and ONU (optical network unit) equipment in a PON; and determining a PON network fault by comparing the acquired data of the optical modules with reference values. The method is greatly different from the existing fault detection way, the way does not need to transform a circuit, an external testing device is not required, the cost is low, the method can be applied to the current network, and the positioning is accurate.

A method and corresponding apparatus for diagnosing problems on a time division multiple access (TDMA) optical distribution network (ODN) is provided. An example method may include: (i) measuring no-input signal power level on a communications path configured to carry upstream communications between multiple optical network terminals (ONTs) and an optical line terminal (OLT) in a passive optical network (PON) at a time no upstream communications are on the communications path from the ONTs to the OLT; (ii) comparing the measured no-input signal power level to a threshold; and (iii) generating a notification in an event the threshold is exceeded. Through the use of this method, faults in optical transmitters, such as bad solder joints, can be determined. Such faults may cause errors in parameters, such as ranging or normalization parameters, associated with communications. By determining the faults, the time required to resolve communications errors can be reduced.

The invention discloses a periodical polling dynamic bandwidth distribution algorithm based on a QoS (Quality of Service) in an OFDM-PON (Orthogonal Frequency Division Multiplexing-Passive Optical Network), belonging to the category of optical fiber communication systems. In the periodical polling dynamic bandwidth distribution algorithm based on the QoS, the priority and the fairness of bandwidth distribution among priority levels are balanced through a secondary dynamic baseband distribution mechanism among the priority levels and inside the priority levels, therefore, the priority that a high priority level service occupies a bandwidth is ensured, the relative fairness of bandwidth distribution among priority levels is also ensured, and the fairness of bandwidth distribution among ONUs (Optical Network Unit) is fully ensured. The periodical polling dynamic bandwidth distribution algorithm based on the QoS can be suitable for an optical access network system utilizing the OFDM-PON. The invention has the advantages of strong practicability, full insurance of QoS, low arithmetic complexity, low cost and the like.

A temperature controlled multi-channel transmitter optical subassembly (TOSA) may be used in a multi-channel optical transceiver. The temperature controlled multi-channel TOSA generally includes an array of lasers optically coupled to an optical multiplexer, such as an arrayed waveguide grating (AWG), to combine multiple optical signals at different channel wavelengths. The lasers may be thermally tuned to the channel wavelengths by establishing a global temperature for the array of lasers and separately raising local temperatures of individual lasers in response to monitored wavelengths associated with the lasers. A temperature control device, such as a TEC cooler coupled to the laser array, may provide the global temperature and individual heaters, such as resistors adjacent respective lasers, may provide the local temperatures. The optical transceiver may be used in a wavelength division multiplexed (WDM) optical system, for example, in an optical line terminal (OLT) in a WDM passive optical network (PON).

Mechanisms for providing a subscriber-side interface with a passive optical network are described herein. An optical network termination (ONT) having an integrated broadband passive optical network processor is utilized to receive downstream data from an optical line termination (OLT) via a passive optical network and provide the contents of the downstream data to one or more subscriber devices via one or more data interfaces. Similarly, the ONT is adapted to receive and transmit upstream data from the one or more subscriber devices to the OLT via the passive optical network. The ONT preferably implements one or more encryption / decryption mechanisms, such as the digital encryption standard (DES), to provide data protection in addition to, or in place of, data churning provided for by the ITU G.983 recommendations.

Devices and methods for optical measurements in point-to-point and point-to-multipoint networks, e.g. like PON networks with splitters are described in which reflected power from some known reflections at the end of the lines is used to determine the attenuation and stability of the attenuation of each line. Also a reference reflection is used at the beginning of the network so that an absolute loss measurement between the points of reflection and the reference reflection can be made. In a further aspect wavelength selective stable reflections and reflectors are used, to provide reflections in a wavelength range that does not interfere with normal operation.

Environmental conditions, such as temperature or wind load, may cause a fiber-optic link to expand or contract, resulting in upstream communications drift. Current methods compensate for such drift assuming it is caused by environmental conditions; however, these methods cannot determine abnormal behavior due to fiber faults that magnify the effect of environmental changes. An example embodiment of the invention provides a method and corresponding apparatus for detecting abnormal drift behavior in a passive optical network (PON) and may include monitoring a metric representative of drift of upstream communications for an optical network unit (ONU) in a PON. The example method may detect and report abnormal behavior in the PON that cannot be fully attributed to “normal” environmental conditions, and indicate a possible fiber cable fault. An ability to detect fiber link faults may allow a system operator to proactively maintain the physical fiber before service interruptions affect an end-user.

The invention discloses a method for managing an optical network unit (ONU) in a passive optical network (PON) system and relates to the field of broadband optical fiber access in the PON system. The method comprises the following steps that: 1, the ONU is powered on and transmits a broadcast message which carries a virtual local area network (VLAN) identifier to an optical line terminal (OLT); 2, the OLT authorizes the ONU, and transmits configuration of a management Internet protocol (IP) or configuration which modifies a management IP network segment to the ONU according to a management IP allocating rule, wherein the management IP allocating rule defines payload contents of a data field of a standard layer-two protocol message, the payload contents carry management IP information, an IP address format is 10. A1. A2. A3, the A2=card slot number of an OLT service disk*10+PON port number, the card slot number of the service disk is between 1 and 16, and the port number is between 1 and 8; and 3, the PON completes the configuration according to a layer-two protocol message which is replied by the OLT. By the method, the function of positioning and maintaining the ONU in various PON systems can be realized.

The invention provides a method for automatically discovering a coaxial broadband access head terminal, a method and a system for managing Ethernet over coax (EOC) terminal equipment. The method comprises the following steps: a first message carrying the basic information of the coaxial broadband access head terminal is multicast by the coaxial broadband access head terminal; and the coaxial broadband access head terminal is discovered after the first message is captured by an optical network unit (ONU); the automatic discovery of the EOC head end equipment can be finished by an optical line terminal (OLT) and network management according to the condition in no need of preconfiguring the equipment IP and the network management IP address; and the network overall topology structure of PON (passive optical network)+EOC can be dynamically displayed to finish the configuration and the management of the EOC head end and the EOC terminal, thus obviously lowering the complexity of PON+EOC network management, engineering starting and maintenance.

The invention discloses a method and a system for positioning a fault of an optical fiber behind an optical splitter in a passive optical network (PON). The method includes the following steps: when a downward branch optical path below a PON port breaks down, an optical time domain reflector (OTDR) is used for inputting downward test light to the PON port, the downward test light is combined with downward service light and then transmitted, and the OTDR is used for collecting the reflection curve of the downward test light and regarding the reflection curve as a test curve; the reflection curve of the downward branch optical path below the PON port when the downward branch optical path does not break down is regarded as a reference curve, and the test curve is compared with the reference curve so as to identify a reflection peak which exists in the reference curve but disappears at a corresponding position in the test curve and to determine a branch optical path, where an optical network user terminal corresponding to the reflection peak which disappears is located, as a fault light splitting branch below the PON port; whether a novel reflection peak exists in the test curve but does not exist at a corresponding position in the reference curve is identified; and if the novel reflection peak exists, the position of the novel reflection peak is determined as the position, where a broken fiber fault happens, in the fault light splitting branch. The method and the system can be used for quickly and accurately positioning the fault of the optical fiber behind the optical splitter in the PON.

The invention discloses a method and device for rapid protection switching of passive optical network (PON) ports in any slot position in a 10 Gbit / s Ethernet PON (10G-EPON) system. The method comprises the following steps: a plurality of PON service protection switching groups formed by two identical PON service cards are arranged on an optical line terminal (OLT); any PON port on one PON service card and any PON port on the other PON service card in each PON service protection switching group are configured as main and standby PON ports respectively; and complex programmable logic devices (CPLDs) on the PON service cards respectively detect the working condition of each autonomous PON port in real time, close optical modules on the main PON ports and notify the other PON service card of enabling the optical modules on the corresponding standby PON ports via protection switching data frames when lost of synchronous (LOS) signals on one or more main PON ports are detected on one PON service card. In the invention, the CPLDs are adopted to detect and judge the switching conditions and control switching, thus avoiding the problem of long switching time caused by using software for treatment and effectively ensuring rapid recovery of services when a single disk or main optical fiber has a fault.

The invention discloses an alarm management method and device of passive optical network terminal equipment. The method comprises the following steps of: receiving alarm information reported by an optical network unit (ONU), and finding a preliminarily configured alarm monitoring template related to the ONU; modifying the alarm grade of the alarm information according to the alarm grade redefinition information configured in the alarm monitoring template, and reporting or abandoning the alarm information based on the alarm grade. By using the method, the function defect of the traditional PON (Passive Optical Network) management system for managing massive ONU alarms is overcome, and the function of providing different alarm monitoring ways aiming at different ONUs and alarm types is realized, therefore, the aim of applying different monitoring schemes by the PON terminal equipment according to the ONUs with different service grades is achieved, and the requirement for fine operation and maintenance of the PON is met.