Abstract: The present invention relates to methods, nodes and systems for enabling enhanced timing recovery between a first node and a second node in a network by adjusting the packet rate based on the link properties, the method including transmitting, from a first node to a second node, a plurality of packets using a first packet rate for transmission, monitoring, by the second node, one or more properties of the transmission of the plurality of packets to obtain a feedback parameter, transmitting from the second node to the first node, the feedback parameter based the on the one or more of the monitored properties, and selecting, in the first node, a second packet rate for transmission based on the received feedback parameter, wherein the feedback parameter transmitted to the first node i) allows the first node to select the second packet rate for transmission based on said parameter, or ii) is the second packet rate for transmission as determined by the second node based on the one or more properties of the transmi

Abstract: There is provided an asymmetric link delay compensation method in which a plurality of calibration profiles maybe used for providing a common network time estimate in a communication network. The communication network comprises a node at least two virtual paths, VP, connecting to one or more sync nodes. The at least two VPs are each associated with one or more respective predetermined calibration profiles with a respective delay correction factor. By identifying which of the VPs may be candidate VPs for calculating a time offset caused by the delay over the VPs and then ranking the candidates to select a best or a set of candidates for the calculation, an advantageous method for providing a common network time in the communication network is achieved.

Abstract: The present invention relates to methods for enabling enhanced timing recovery between a first node and a second node in a network, the method comprising transmitting a plurality of packets from a first node to a second node, performing time transfer between the first node and the second node to obtain a first compensation factor, the first compensation factor being a mean value of a first sequence of min samples from a first min distribution, obtaining a second compensation factor, the second compensation factor being determined as i) a mean value of a second sequence of min samples from a second min distribution, the second min distribution being obtained by subtracting the mean value of the first sequence of min samples from the respective min samples of the first sequence of min samples, or ii) a rate of change of the mean value of the first sequence of min samples between a first and second block of packets, and enabling enhanced time recovery between the first and the second node by using the second com

Abstract: The present invention relates to methods for enabling use of a pluggable module in a host system, regardless of the type of pluggable module used in view of the module ports of the host system, which is realized using an adaptation device. The disclosure also relates to corresponding devices; adaptation devices and host systems. The methods comprise inserting a pluggable module in a module port of a host system, obtaining information indicating an electrical interface of pluggable module and setting a mode of operation of the adaptation device for re-routing and adapting signals to/from the pluggable module towards one or more controlling entities of the host system based on the electrical interface of the pluggable module.

Abstract: There is provided a method for providing edge node (110) fault management and bandwidth, (BW), control for transmission of a data stream in a packet-based network. The method comprises adaptively transmitting a data stream (DS) by controlling an outgoing data stream being transmitted to one or more client devices (151, 152, 153) by analyzing at least one data stream characteristics of a corresponding received data stream (DS1, DS2, DS3) of the one or more receiving client devices (151, 152, 153), and providing a transmission strategy for the outgoing data stream based on said analyzed data stream characteristics. Thereby accurate adjustment of consumed (BW) and an associated recovery scheme, i.e. FEC and/or retransmission, to maintain highest achievable performance when it comes to video quality and also affect on other services, are provided.

Abstract: The present invention relates to systems, methods and nodes for enabling synchronization between a plurality of nodes in a network, by comparing the times of the GPS clocks of the plurality of nodes to determine accurate clocks being within a tolerance of each other, adjusting priority, and, if the priority of a local clock of a node is low, selecting a remote GPS clock to be used as a timing reference of the GPS clock of the node.

Abstract: There is provided a GNSS independent method for asymmetry delay error compensation to minimize a time difference bias when using two-way time transfer in a communication network. The method includes establishing a bidirectional virtual path comprising at least one link path, LP1-LP4, over the network for communication between a first node A and a second node B by sending a bidirectional data stream over the virtual path and utilizing previously stored link profiles associated with a delay correction factor or a calibrated virtual path or a stable local clock in holdover mode to provide new delay correction factor to minimize a time difference bias in the local time in the second node.

Abstract: There is provided a method in a communication network system 100 of e.g. IP type for live distribution of media content capable of node-to-node time-transfer between nodes in the network system. The media content is sent as a data stream DSx via respective communication links over a network 200. The method comprises transferring local clock signal between nodes and based on received local clock signals determining a unidirectional delay between the nodes. The traffic between the nodes is then based on the determined unidirectional delay.

Abstract: The present invention relates to methods for enabling use of a pluggable module in a host system, regardless of the type of pluggable module used in view of the module ports of the host system, which is realized using an adaptation device. The disclosure also relates to corresponding devices; adaptation devices and host systems. The methods comprise inserting a pluggable module in a module port of a host system, obtaining information indicating an electrical interface of pluggable module and setting a mode of operation of the adaptation device for re-routing and adapting signals to/from the pluggable module towards one or more controlling entities of the host system based on the electrical interface of the pluggable module.

Abstract: There is provided a method in a remote media production system in an IP network, in which media production is performed at a stadium or the like, and the produced media content is transferred to a home studio for final production. The media content is transported in individual data streams over a network. In a receiving node R an aggregate of individual delays for the transferred data streams is monitored and form basis for determining at least one network delay correction factor or at least one common network offset for the individual data streams. The method further comprises time adjusting data transmitted over the network with the common network offset.

Abstract: There is provided a method in a communication network system 100 of e.g. IP type for live distribution of media content capable of node-to-node time-transfer between nodes in the network system. The media content is sent as a data stream DSx via respective communication links over a network 200. The method comprises transferring local clock signal between nodes and based on received local clock signals determining a unidirectional delay between the nodes. The traffic between the nodes is then based on the determined unidirectional delay.

Abstract: There is provided a method in a communication network system of e.g. IP type for live distribution of media content capable of node-to-node time-transfer for synchronizing a respective local clock of an originating server and at least one client device or other server by means of two-way time transfer. The media content is sent as a data stream using unicast or multicast via respective communication links over a network. The method comprises employing a mode in which two-way time transfer is selectively provided, selectively meaning that two-way time transfer is employed such that the amount of per client specific time information being exchanged by the server and client devices is controlled, e.g. by time limiting the two-way time transfer, or during that mode reducing the occurrence of full two-way time transfer based synchronization of the client devices.

Abstract: The present invention relates to methods and apparatuses for allocating time slots to circuit-switched channels established to comprise one or more respective time slots in a recurrent frame of a time division multiplexed network. According to the invention, a time slot allocated to said channel is associated with a selected level, of at least two available levels of priority. Decisions as to whether or not to deallocate said time slot from said channel is then based upon a comparison of said selected level of priority and a level of priority associated with a request for a time slot for another channel.

Abstract: An apparatus for switching data between a first set of bitstreams and a second set of bitstreams, each of said bitstreams being divided into recurring frames and each of said recurring frames being divided into time slots, is disclosed. The switch comprises a first set of switching elements, at least one intermediate set of switching elements, and a last set of switching elements. Each switching element comprises a number of input ports and a number of output ports. The input ports of the first set of switching elements are arranged to receive the first set of bitstreams and the output ports of the last set of switching elements are arranged to provide said second set of bitstreams. Furthermore the switching elements are arranged so that there are more than one path from a switching element in the first stage to a switching element in the last stage.

Abstract: The present invention relates to methods for changing the bandwidth of a circuit switched channel in a time division multiplexed network, wherein said channel comprises a set of time slots within each recurring frame of a bitstream between a first node and a second node. According to the invention one or more additional time slots within each recurring frame of said bitstream are reserved, including using, during a period of time, only said set of time slots for transmitting payload data pertaining to said channel while providing, during said period of time, information indicating that said one or more additional time slots are currently not used for transferring payload data. After said period of time, said set of time slots is used as well as said one or more additional time slots on said bitstream for transmitting payload data pertaining to said channel.

Abstract: The present invention refers to a method for controlling resources on a communication link that transports data in time slots, wherein access to the time slots is distributed among nodes connected to the link. A state of access to a set of one or more of the time slots may be determined by the step of sending an inquiry to one or more of the nodes and receiving one or more replies to the inquiry from the one or more nodes. The inquiry and replies may be related to whether or not any one of the one or more nodes considers itself as currently having access to any one or more of the set of time slots.

Abstract: The present invention relates to methods and an apparatus for switching data. According to the invention, storage means providing three or more frame buffers are used for temporarily storing frames of time slot data received via an input port of said apparatus. Read and write pointers are provided to designate which of said frame buffers that are used to be read/write accessed at each point in time.

Abstract: The present invention refers to the field of communication networks having a number of nodes connected to the same link, the capacity of the link being divided into frames which in turn are divided into time slots. A procedure is used for informing each node on the link of which nodes that are connected to the link and which slots that it has access to. A verifying procedure is used for subsequently verifying that information separately held by said nodes is not inconsistent regarding the nodes' right to allow sending of data in said slots. In addition, said verifying procedure is disabled from producing a positive verification during transition periods at which different nodes on the link risk having inconsistent link data.

Abstract: The present invention refers to a method and an apparatus for synchronizing operation at a node of a communication network. According to the invention a phase relationship between an output frame synchronization signal and an input frame synchronization signal is controlled by the adjustment of a phase difference between the output frame synchronization signal and a node synchronization signal.

Abstract: The present invention refers to an apparatus for time and space switching data from a first and a second input signal to a first and a second output signal, said apparatus comprising at least four switch elements, each having a first and second input port and an output port. Each one of the switch elements comprises switching means arranged to provide for time-switching of data received from said first input port to provide an output referring to said output port and selecting means for defining a signal to be outputted from said output port by selectively combining said output from said switching means and data received via said second input port, the mutual order of said data received via said second port being the same when incorporated into said signal as when received via said input port.