Abstract: A network element has at least one receiver, a software queue, and at least one transmitter. A data path thread moves data packets from a receive queue of the receiver to the software queue, and a transmit driver moves data packets from the software queue to a transmit queue of the transmitter. A flow indicator associated with the software queue is controlled to indicate when at least one data packet remains in the software queue. A queue management thread polls the flow indicator to determine when the software queue should be accessed for ensuring that data packets do not remain in the software queue for extended time periods between data bursts.

Abstract: A telecommunication system is described that allocates backup power to telephones based on telephone usage. When power to the telecommunication system from a primary source, such as from an electrical utility company, is lost, a backup power source is used to keep the telecommunication system functioning. Because the backup power source has a limited amount of energy, only telephones with a high priority are fully powered. Other telephones are provided with reduced power or receive no power. As the energy level of the backup power source is reduced, the telephone priorities are adjusted.

Abstract: Embodiments of the present disclosure generally pertain to systems and methods for compensating for impulse noise. A system in accordance with an exemplary embodiment of the present disclosure comprises a receiver coupled to a subscriber line. The receiver is configured to receive an encoded data signal via the subscriber line and separate the signal into a common mode (CM) signal and a differential mode (DM) signal. The receiver is further configured to detect impulse noise on the CM signal and mark corresponding sub-words of the DM signal affected by the detected impulse noise as erasures. The receiver then decodes the DM signal based on whether the sub-words are marked as erasures.

Abstract: A system for hair pinning-time division multiplexing (TDM) calls has a gateway positioned between a non-TDM network and communication equipment coupled to the gateway via a plurality of TDM lines. The gateway has a plurality of signal processing elements configured to encapsulate the TDM call data into a plurality of packets utilizing a protocol suitable for transmission through the network, and each signal processing element has its own time domain such that the signal processing elements operate asynchronously. The gateway also has a central processing element configured to forward the packets to the network via the network protocol. The central processing element is further configured to identify packets which are mapped to channels of TDM lines coupled to the gateway and to forward the packets to the appropriate signal processing element for transmission through the appropriate TDM channel. Accordingly, hair pinning across asynchronous time domains is achieved within the gateway.

Abstract: Telecommunications enclosures are described in this document. In one aspect, a telecommunications enclosure includes side panels having seals and an enclosure top connected, independent of a frame, to top ends of the side panels. The enclosure top has an enclosure top outer end that extends between the side panels and includes a seal. An interior panel is connected, independent of a frame, to side panels and has an interior panel outer end that extends between the side panels. The interior panel is separated from the enclosure top by a first distance and separated by a second distance from bottom ends of the side panels. A removable door is formed to engage the seals when the removable door is secured to the frameless telecommunications enclosure.

Abstract: Telecommunications enclosures are described in this document. In one aspect, a telecommunications enclosure includes side panels having seals and an enclosure top connected, independent of a frame, to top ends of the side panels. The enclosure top has an enclosure top outer end that extends between the side panels and includes a seal. An interior panel is connected, independent of a frame, to side panels and has an interior panel outer end that extends between the side panels. The interior panel is separated from the enclosure top by a first distance and separated by a second distance from bottom ends of the side panels. A removable door is formed to engage the seals when the removable door is secured to the frameless telecommunications enclosure.

Abstract: A rogue access point in a wireless local-area network can be disabled by an authorized access point wirelessly transmitting a layer-2 broadcast packet. If a rogue access point receives this broadcast packet, it will forward a copy to the switch to which it is connected. The switch then determines whether the port on which the copy of the broadcast packet is received is associated an authorized access point port. If the switch determines the port is not an authorized access point port, the switch shuts down the port.

Abstract: An optical communication system has a power dissipating element that is thermally coupled to an optical transmitter. The currents supplied to the transmitter and the power dissipating element are controlled such that the sum of such currents is constant. Accordingly, temperature fluctuations in the transmitter due to patterns in the transmitted data are prevented or at least reduced, thereby reducing thermal tails on measurements. In one exemplary embodiment, a light source is used as the power dissipating element, and the output of such light source is beneficially used to probe another optical fiber or to enhance the OTDR performance or analysis.

Abstract: A system and method detects within an IP network an offending network device that has been adversely affecting the IP network performance. A discovery protocol frame is propagated to successive network switches and is formed as a field having a query for inquiring within each network switch to which the frame is propagated whether the network switch has a database entry regarding the MAC address and switch port for the offending network device to locate the offending network device. This discovery protocol frame includes a command for any network switch that has the offending network device connected thereto to disable the switch port to which the offending network device is connected or block all data traffic from the MAC address of the offending network device.

Abstract: A communication system comprises a plurality of line cards having transceivers coupled to a plurality of subscriber lines. Each line card has at least one active transceiver within the same vectoring group, and each line card also has vector logic capable of cancelling crosstalk induced by an active transceiver that is a member of the vectoring group. Further, the line cards are coupled to one another via a ring connection across which vectoring information is passed from one line card to the next. In the event of a failure of one of the line cards, the failed card is bypassed by the vectoring stream so that the operational line cards can continue crosstalk vectoring operations despite such failure.

Abstract: Systems and methods for locating faults in a digital subscriber line (DSL) system in accordance with the disclosure include a handshake messaging procedure that is used to rapidly obtain interconnectivity information of various subscriber loops that are present in a DSL repeater chain. The interconnectivity information is used to provide an identification of one or more faulty loops when such faulty loops are present in the DSL repeater chain. The identification may be provided in the form of a topological representation that can be used to execute targeted line testing procedures on the faulty loops without wasting time on testing loops that are not faulty.

Abstract: Methods, systems, and apparatus for diagnosing and optimizing an Internet Protocol television (IPTV) network are disclosed. In one aspect a method includes receiving a network address of a device; detecting a network topology associated with the device based on the network address of the device; identifying a configuration parameter setting associated with the network topology that is outside of a range of acceptable configuration parameter settings for the network topology; and providing output specifying the configuration parameter setting that is outside of the range of acceptable configuration parameter settings.

Abstract: A device is suggested comprising a first DSL system operating in a first frequency band, a second DSL system operating in a second frequency band and a filter unit connected to a line and to each of the first DSL system and the second DSL system.

Abstract: The present disclosure generally pertains to systems and methods for enabling leaf isolation in a multi-node tree network. In one exemplary embodiment, an Ethernet virtual network (EVC) system has a multi-node E-Tree network comprising a plurality of nodes (e.g., switches), including at least one ingress node and at least one egress node. The ingress node is configured to receive a data packet to be communicated through the E-Tree network and to modify a field, such as the tag protocol identifier (TPID), in the packet's header to indicate whether the data packet is received by the ingress node via a leaf port. As the data packet is communicated through the E-Tree network, the nodes determine the leaf status of the packet based on the modified field thereby enabling the nodes to enforce leaf isolation rules. The egress node upon receiving the packet is configured to adjust the modified field as appropriate such that the field on egress matches the field on ingress.

Abstract: A system for dynamically learning virtual local area network (VLAN) tags comprises a switching element having a VLAN table and a media access control (MAC) table. For at least one VLAN, the switching element is configured to dynamically learn VLAN tags for packets carried by the VLAN in order to build the VLAN table and to then use mappings of the VLAN table, rather than mappings of the MAC table, to make forwarding decisions for all types of packets carried by the VLAN. The MAC table is not used for forwarding decisions for packets carried by the VLAN, but it can be used to help learn the VLAN tags. In particular, the switching element can use the MAC table to selectively trap packets when they are useful for learning VLAN tags and to prevent MAC learning traps for packets carrying VLAN tags previously learned by the switching element.

Abstract: Methods, systems, and apparatus for protecting electrical components are disclosed. In one aspect a system includes a first gas discharge tube connected to a first conductor of a first twisted wire pair; and a second gas discharge tube connected to a second conductor of the first twisted wire pair. The first gas discharge tube can also be connected to a third conductor of a second twisted wire pair, and the second gas discharge tube can be connected to a fourth conductor of the second twisted wire pair.

Abstract: The present disclosure generally pertains to systems and methods for provisioning nodes of a packet network. Rather than requiring a user to individually set the configuration parameters of each node to achieve a desired behavior, the user is presented with options of various predefined network behaviors and/or the option of customizing a network behavior, such as a queuing, scheduling, or shaping profile, and each node is configured to automatically provision its configuration parameters to implement the desired behavior. Information is passed from node-to-node so that each node can automatically provision its settings to implement such behavior. Thus, the network is automatically provisioned thereby facilitating the provisioning process. Automatic provisioning also helps to ensure a correct network configuration. Indeed, since the provisioning is automatic, at least some manual provisioning errors may be prevented.

Abstract: A communication system has a trunk extending from a network facility, such as a central office, with a plurality of distribution points positioned along the trunk. Each leg of the trunk defines a shared channel that permits peak data rates much greater than what would be achievable without channel sharing. As an example, the connections of each respective trunk leg may be bonded. Further, the same modulation format and crosstalk vectoring are used for each leg of the trunk. The crosstalk vectoring cancels both far-end crosstalk (FEXT) that couples between connections of a given trunk leg and crossover crosstalk that couples between one trunk leg and another. In addition, logic determines an amount of excess capacity available for each leg of the trunk and controls error correction based on the determined excess capacity.

Abstract: A small form factor pluggable (SFP) device has an embedded optical time domain reflectometer (OTDR) for detecting anomalies along an optical fiber. The SFP device has a plurality of optical subassemblies (OSAs) that are used to transmit an optical data signal at a first wavelength, transmit an optical OTDR signal at a second wavelength, and receive an optical data signal at a third wavelength. The OTDR signal is effectively isolated from the data signals based on wavelength, and samples of returns of the OTDR signal are analyzed to detect at least one anomaly along the optical fiber.

Abstract: An exemplary optical transmission system comprises an optical subassembly (OSA) coupled to an optical receiver via an optical fiber. The OSA comprises a laser diode configured to transmit optical signals across the optical fiber, and the OSA further comprises an avalanche photodiode (APD) configured to receive optical return signals from the optical fiber. The system further comprises a crosstalk canceller configured to estimate an amount of electrical crosstalk affecting measurements of the return signals in order to cancel such crosstalk from measurements of subsequent optical signals received by the APD.