Abstract:
Systems and methods for performing clock recovery on a received signal using a split loop architecture are described. A split loop timing recovery apparatus is provided comprising a first path configured for performing frequency offset tracking on a signal by adjusting a receiver clock frequency to match a remote transmitter frequency associated with the signal and a second path configured for tracking random jitter on the signal.
Abstract:
Described herein are methods, systems, and software for accommodating failover of a content node in a content delivery network. In one example, a method of operating a content node includes receiving a communication for an end user device from a control node, wherein an interrupted content node previously handled the communication. The method further includes determining if the communication includes a synchronization packet and identifying connection information for the communication. The method also provides, if the communication includes a synchronization packet, accepting the communication and handling delivery for the end user device. The method also includes, if the communication does not include the synchronization packet, determining if a match exists between the connection information for the communication and connection information stored in a flow table, and handling the communication based on the match.
Abstract:
A method for differential buffer phase correction comprises generating a pair of differential signals from a local oscillator, applying one of the signals to a first inverter and the other signal to a second inverter of a buffer through a differential pair of lines, applying a first positive feedback signal to the first inverter through a first feedback capacitor, wherein the first positive feedback signal is generated from an output of the second inverter and applying a second positive feedback signal to the second inverter through a second feedback capacitor, wherein the second positive feedback signal is generated from an output of the first inverter.
Abstract:
A method comprising modulating a plurality of synchronized signals by an orthogonal probe sequence (OPS) to generate a plurality of modulated synchronized signals, wherein the OPS comprises a zero element (0-element) column that indicates a start or an end of the OPS, and concurrently transmitting,using one or more transmitters, the plurality of modulated synchronized signals over a duration of a number of discrete multi-tone (DMT )symbols,wherein each of the plurality of modulated synchronized signals is intended for one of a plurality of receivers that are remotely coupled to the one or more transmitters via a vectored group of subscriber lines, and wherein the 0-element column causes all of the plurality of modulated synchronized signals to have a zero-amplitude during a first or a last of the DMT symbols.
Abstract:
Ce procédé de synchronisation d'une grappe de serveurs comportant une pluralité de nœuds (N i,j,k,l ) munis chacun d'une horloge interne et interconnectés entre eux par un réseau d'interconnexion d'horloges comportant une pluralité de segments de transmission, comporte les étapes suivantes : génération (100) d'une information d'horodatage (H) par l'horloge interne d'une source (N 1,1,1,1 ) choisie parmi les nœuds (N i,j,k,l ) de la grappe de serveurs; transmission (110) de cette information d'horodatage (H) à l'ensemble des nœuds (N i,j,k,l ) de la grappe de serveurs à partir de la source (Ν 1,1,1,1 ); et réglage (130) de l'horloge interne de chaque nœud (N i,j,k,l ) de la grappe de serveurs à partir de cette information d'horodatage (H). Il comporte en outre les étapes suivantes : réglage (110) du temps de transmission de l'information d'horodatage (H) par chaque segment de transmission à une valeur constante établie pour chaque segment de transmission; à réception (120) de l'information d'horodatage (H) par l'un quelconque des nœuds (N i,j,k,l ) de la grappe de serveurs, réglage (130) de son horloge interne à partir de l'information d'horodatage (H) et d'une information relative aux segments de transmission traversés entre la source (Ν 1,1,1,1 ) et ce nœud (N i,j,k,l ).
Abstract:
A synchronizing method and system between a Radio Frequency (RF) transmitter and a battery powered receiver wherein the transmitter transmits short duration first periodic sync signals which are used by the receiver to maintain proper synchronization of the receiver with the transmitter during second periodic wake-up windows for transmission of data. The receiver wakes for a short duration at the start of each periodic wake up window to receive a possible transmission of data, and if no transmission is received goes back to sleep, and if a transmission is received stays awake to receive the full transmission of data. The basic principle is that the average current consumed by the battery powered receiver in order to wake periodically to receive the first periodic sync signals and the second periodic data transmissions is less than the average current required to maintain the receiver awake continuously. The duration (e.g. 14ms) and periodicity of (e.g. every 32s) of the periodic signals are selected to meet a FCC regulation of 2 second/hour allowed for synchronization.
Abstract:
Various aspects and embodiments of the present invention derive statistics of received signal quality and use these statistics to jointly control operation of timing recovery, carrier recovery, automatic gain control, and equalization functions.