1677 results about "Path switching" patented technology

The present invention is directed to a high speed packet switching network and, in particular to a method and system for minimizing the time to establish a connection between an origin and a destination node. Due to high dynamicity of the traffic on transmission links, it is important to select a routing path according to a fully up-to-date information on all network resources. The simpler approach is to calculate a new path for each new connection request. This solution may be very time consuming because there are as many path selection operations as connection set up operations. On another hand, the calculation of paths based on an exhaustive exploration of the network topology, is a complex operation which may also take an inordinate amount of resources in large networks. Many of connections originated from a network node flow to the same destination network node. It is therefore possible to take a serious benefit in reusing the same already calculated paths for several connections towards the same node. The path calculated at the time the connection is requested is recorded in a Routing Database and updated each time a modification occurs in the network. Furthermore, alternate paths for supporting non-disruptive path switch on failure or preemption, and new paths towards potential destination nodes can be calculated and stored when the connection set up process is idle. These last operations are executed in background with a low processing priority and in absence of connection request.

An apparatus, method and system are disclosed for providing AC line power to lighting devices such as light emitting diodes (“LEDs”). An exemplary apparatus comprises: a plurality of LEDs coupled in series to form a first plurality of segments of LEDs; a plurality of switches coupled to the plurality of segments of LEDs to switch a selected segment into or out of a series LED current path in response to a control signal; a memory; and a controller which, in response to a first parameter and during a first part of an AC voltage interval, determines and stores in the memory a value of a second parameter and generates a first control signal to switch a corresponding segment of LEDs into the series LED current path; and during a second part of the AC voltage interval, when a current value of the second parameter is substantially equal to the stored value, generates a second control signal to switch a corresponding segment of LEDs out of the first series LED current path.

Embodiments of a system and method for rule-based proactive storage path optimization for SANs. Embodiments may evaluate paths between an application and its storage on a SAN based on current and / or historical path quality of service. Performance of alternative paths may be monitored to determine if a better path than a path currently in use is available. If a better path is determined, then the path may be switched to the better path. In one embodiment, one or more zones may be reconfigured to migrate to a different path. Path migration may be performed automatically without user intervention. Alternatively, a user may be given the option to manually migrate to a new path. Embodiments may proactively change paths between an application and its storage before path performance becomes a problem. Embodiments may be integrated with a SAN management system or, alternatively, may be standalone mechanisms.

An apparatus, method and system are disclosed for providing AC line power to lighting devices such as light emitting diodes (“LEDs”). An exemplary apparatus comprises: a plurality of LEDs coupled in series to form a first plurality of segments of LEDs; a plurality of switches coupled to the plurality of segments of LEDs to switch a selected segment into or out of a series LED current path in response to a control signal; a current sensor; and a controller which, in response to a first parameter and during a first part of an AC voltage interval, generates a first control signal to switch a corresponding segment of LEDs into the series LED current path; and during a second part of the AC voltage interval, generates a second control signal to switch a corresponding segment of LEDs out of the first series LED current path.

A protection mechanism capable of providing both local and end-to-end connection protection for dual homed access / aggregation devices or customer-edge devices in a network. The protection mechanism provides end-to-end and fast local protection for off the shelf access devices that do not have any built in per-connection protection capabilities. The access device is connected via two separate physical uplinks to two edge switches of the network. For each connection to be protected, a main path is provisioned from one edge switch and an alternative path is provisioned from the other edge switch. The edge switches are adapted to comprise means for switching traffic from the main path to the alternative path in the event a failure along the main path is detected. Failures both in the stack portion, the core portion and in the access device uplinks are protected against.

In a storage system, a server, a storage device, and an encryption device are connected to ports of a fabric switch. Encryption management software of the server performs, on the basis of encryption setting information inputted to an encryption setting information storing unit from the outside and stored in the encryption setting information storing unit, connection setting for the ports of the fabric switch such that a path from the server to the storage on which encryption is performed passes through the encryption device and such that a path on which encryption is not performed does not pass through the encryption device. It is possible to freely switch a path on which encryption is performed simply by changing encryption setting information.

A data center path switch architecture permits path switching of the signal path of incoming signals to one or more output paths in real time without the need for manual intervention, and without delays associated with current data center network switches. In this architecture, a switching core capable of switching signals directly from the ingress of the switching core to alternate destination ports in real time, either under software or hardware control.

A method for operating a node in a computer network is disclosed, where the network is made up of nodes connected by links. The method has the steps: determining an alternate path for one or more links; reserving resources for the alternate path; and rerouting traffic on the alternate path in case of a link failure. The alternate path may be periodically updated. A plurality of alternate paths may be maintained. The alternate paths may not have any links in common. User traffic may be rerouted substantially simultaneously to each link of the alternate path in the event of failure of a primary path.

In an ATM virtual path switching node, upon being notified of a current virtual path by a virtual path monitoring unit, a link fault determination unit compares the number of faulty current virtual paths with a predetermined threshold value. When the number of faulty current virtual paths is equal to or larger than the threshold value, a link fault is determined, and a message communication unit transmits / receives a link fault notification signal to / from another ATM virtual path switching node. When the number of faulty current virtual paths is smaller than the threshold value, a current virtual path fault is determined, and the message communication unit transmits / receives a virtual path fault notification signal to / from another ATM virtual path switching node. The message communication unit transmits a switching control signal for designating switching from the current virtual path to a stand-by virtual path. A current virtual path information management unit manages correspondence between the current virtual path having, as one switching terminal, a self ATM virtual path switching node and a plurality of links in an ATM network.

There is described a cross-connect apparatus which can apply a cross-connect operation in place of a function of a hard switch that has conventionally been used for a purpose other than a cross-connect operation, by selection of line setting information used for path switching and service selection operations, and by performing a cross-connect operation based on the information, thereby preventing redundant configuration of the cross-connect apparatus and diminishing power consumption.

The present invention suitably monitors the performance of a migration destination volume and conducts data migration all over again over a short time. When conducting data migration, all data is copied from the migration source volume to the migration destination volume, and when the full copy is completed, the host access path is switched to the migration destination volume 2. The copy-pair between the volumes is maintained following completion of the full copy, and difference data created in the migration destination volume is managed. A performance monitoring unit monitors performance of the migration destination volume based on indices according to migration source volume type. When, as a result of monitoring, restoration to the status prior to data migration is decided, difference data is copied from the migration destination volume to the migration source volume, and the host access path of the host is switched to the migration source volume.

A resilient virtual Ethernet ring has nodes interconnected by working and protection paths. If a span fails, the two nodes immediately on either side of the failure are cross-connected to fold the ring. Working-path traffic is cross-connected onto the protection path at the first of the two nodes and is then cross-connected back onto the working path at the second of the two nodes so that traffic always ingresses and egresses the ring from the working path. A traffic originating node, upon determining that transmitted packets are being looped back due to a fault on a primary path, is adapted to switch transmission of data packets from the primary path to a secondary path.

A method and device for path switchover in communications field are provided. The method includes: detecting communication quality of traffic transmitted on an active path and obtaining a detection value of the communication quality; determining whether the detection value meets a switching condition; if yes, switching the traffic transmitted on the active path to a standby path. The device includes a detecting module, an obtaining module, a determining module and a switching module. The embodiment of the present disclosure integrates the NQA technology for detecting the path communication quality and the TE FRR fast path switching technology, and the NQA detection result may trigger the TE FRR path to switch quickly. Therefore, when the signal quality of the path degrades, making the QoS requirement of the SLA hard to meet, the traffic may be switched to standby path to meet the requirement of the SLA agreed originally between the carrier and the user, so as to improve the user experience and the satisfactory degree on the service provided by the carriers.

A method for controlling communications paths in a storage system provided between a storage device and a plurality of host devices. The method includes: respectively monitoring communications statuses between each of the host devices and the storage device; detecting whether a prescribed temporary failure, which can be corrected without switching communications paths, has occurred, based upon the detected communications statuses; a switching instruction step of not outputting a switching request signal for requesting switching from a failed communications path to a to-be-used communications path, before a number of occurrence of the prescribed temporary failure thus detected reaches a threshold value which is equal to or larger than 2, and outputting the switching request signal only when the number of occurrence of the prescribed temporary failure reaches the threshold value; and selecting the to-be-used communications path, from among the plurality of communications paths, on the basis of the switching request signal.

An improved method is provided for switching paths at a network routing device residing in a multicast distribution environment. The method includes: maintaining a plurality of predetermined path sets in a data store associated with the network routing device, where each path set corresponds to a given network condition and defines a path for each data transmission session; receiving a message indicative of a current network condition at the network routing device; selecting a path set from the plurality of predetermined path sets, where the selected path set correlates to the current network condition; and configuring the network routing device in accordance with the selected path set.

Wi-Fi setup application and path switching applications are provided to allow commands received from native applications of the UE to be redirected to a Wi-Fi engine. The Wi-Fi engine supports circuit switched and packet switched services over a Wi-Fi connection, thus allowing commands received from native applications on a UE to connect the user to either a wireless unlicensed communication system or a wireless licensed communication system.

This invention discloses an ion implantation apparatus with multiple operating modes. It has an ion source and an ion extraction means for extracting a ribbon-shaped ion beam therefrom. The ion implantation apparatus includes a magnetic analyzer for selecting ions with specific mass-to-charge ratio to pass through a mass slit to project onto a substrate. Multipole lenses are provided to control beam uniformity and collimation. The invention further discloses a two-path beamline in which a second path incorporates a deceleration system incorporating energy filtering. The invention discloses methods of ion implantation in which the mode of implantation may be switched from one-dimensional scanning of the target to two-dimensional scanning, and from a simple path to an s-shaped path with deceleration.

A failure-recovery-information storing unit stores failure-recovery information in which a working path is associated with a backup path. A failure-occurrence-notification receiving unit receives a failure-occurrence notification indicating that a failure has occurred in the working path. A backup-path searching unit searches for a backup path corresponding to the working path on which the failure has occurred, based on the failure-recovery information. A path-switch processing unit carries out a path-switch process, in such a manner that the data to be transferred using the working path in which the failure has occurred is transferred using the backup path.

The present invention is a methodology for controlled switchover of unicast and multicast data flows in packet based switching system. In some cases it is advantageous to purposefully support switchover of flows from one path to the other without causing loss of data. This is termed a “controlled” or “hitless” switchover. In accordance with the present invention switchover methodology, given that an ingress arbiter device is transmitting to both cores simultaneously, it is required that the flows to both switching cores be synchronized at an aggregator level and that an egress arbiter be given time to cease receiving packets from one Core then switch over to the other Core, and continue receiving packets.

Current network switching architectures require communication with a higher level network control plane, which can be slow to reroute communications, resulting in unacceptable losses of communications for customers. Examples embodiments of the present invention reroute communications faster detecting optical power of an optical signal at optical switches coupled via optical communication paths, and causing at least one optical communication path between a first optical switch and second optical switch to switch to an alternative optical communication path, in part, through physical layer triggering in an event optical power at at least one of the first or second optical switches falls below a threshold level. Switching in response to physical layer triggering may result in reduced switching times and, consequently, faster restoration of communications to customers after a network fault interruption.

A transceiver system having an RF front-end operatively connected to two separate non-50 ohm antennas for separately providing transmission / reception paths for 1 GHz band and for 2 GHz band. A switching module is operatively connected to each antenna for mode and frequency-range selection within each band. Each switching module has a plurality of switching elements connected to a plurality of signal paths. Matching is separately and independently provided for each signal path. The matching can be achieved by using distributed elements or lumped elements arranged in shunt or series in order to widen the bandwidth. An electrostatic discharge protection circuit is provided between the antenna feed point and the switching module. The protective circuit can also be used as a discrete matching network that can be optimized depending on the phone mechanics and dimensions.

An optical transmission system that offers more efficient bandwidth usage in normal operation, as well as enhanced fault tolerance for higher service availability. A transponder converts high-priority and low-priority client signals into high-priority and low-priority wavelength signals to be added to network traffic. An optical switch fabric normally delivers high-priority and low-priority wavelength signals to high-priority and low-priority paths, respectively, where the two paths run in opposite directions. Such signals and paths are prioritized in terms of survivability against network failure. In case of a network failure, the optical switch fabric performs protection switching in either duplicate switching mode or path switchover mode depending on network failure information and drop wavelengths of each optical transmission device. In duplicate switching mode, high-priority wavelength signals are directed to both the high-priority and low-priority paths. In path switchover mode, they are routed to the low-priority path, instead of the high-priority path.

In a network made up of a plurality of devices each capable of a multi-hop communication that conforms to at least one of the wired communication standards or wireless communication standards, each device monitors a communication situation on communication links and path established between the device and a destination device. When the communication situation changes, the device switches the communication path for use in a communication with the destination device to another communication path which can be established between the device and destination device.

A gas supply system for supplying a gas into a processing chamber for processing a substrate to be processed includes: a processing gas supply unit; a processing gas supply line; a first and a second processing gas branch line; a branch flow control unit; an additional gas supply unit; an additional gas supply line; a first and a second additional gas branch line; a flow path switching unit; and a control unit. Before processing the substrate to be processed, the control unit performs a pressure ratio control on the branch flow control unit while the processing gas supply unit supplies the processing gas. After the inner pressures of the first and the second processing gas branch line become stable, the control unit switches the pressure ratio control to a fixed pressure control, and then the additional gas supply unit supplies the additional gas.

The mobile edge calculates close attention of researchers caused by communication advantages brought by the fact that the mobile edge is close to a user, and the communication quality of vehicles canbe effectively improved by combining the mobile edge with the Internet of Vehicles technology. Task offloading problems based on vehicle mobility management are studied herein. In consideration of real-time switching of a communication area passing through a base station and real-time connection and disconnection of a communication line when a vehicle moves, the task unloading problem is decomposed into a resource-based unloading proportion distribution sub-problem and a prediction-based path switching sub-problem. And a maximum energy-saving selection algorithm and a short-term path prediction algorithm are formulated to meet the time delay constraint and minimize the task unloading energy consumption at the same time.