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.

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 an apparatus providing routing of asynchronous traffic in a circuit switched synchronous time division multiplexed network, said apparatus comprising an interface (12) providing access to a multi-channel bitstream carrying isochronous channels; routing means (26) for providing routing of data packets; and a communication medium (24) interconnecting said interface and said routing means. According to the invention, said interface (12) comprises means (18) for deriving data packets received in at least one of said isochronous channels, means (22) for transmitting only header portions of said data packets to said routing means via said communication medium (24), means (20) for temporarily storing at least body portions of said data packets, and means (22, 32) for forwarding said data packets in accordance with routing instructions received from said routing means.

Abstract: The present invention refers to methods for establishing control signaling between nodes connected to the same communication link, said link carrying a bitstream that is divided into frames, each frame in turn being divided into time slots, said time slot being allocatable to define circuit switched channels. According to the invention, all nodes connected to said link using, at link start-up, the same predefined time slot or set of time slots in said frames to receive control signaling messages from and transmit control signaling messages to nodes connected to said link. The nodes then establishes, using control signaling via said predefined time slot or set of time slots, respective control channels, defined by respective time slot or set of time slots in said frames, reserved for transmission of control signaling messages from each respective one of said nodes.

Abstract: The present invention refers to methods and apparatuses for providing synchronization in a time division multiplexed network, wherein data is transferred on multi-access bitstreams in circuit-switched channels that are defined by respective time slots of regularly recurrent frames of said bitstreams, said frames being defined by regularly recurrent frame synchronization signals transferred on said bitstreams. According to the invention an auxiliary regularly recurrent frame synchronization signal is generated and selected as a basis for defining said frames on a bitstream if the frame synchronization signal that is used as a basis for synchronizing said frames during normal operation is not detected in accordance with an expected frame rate.

Abstract: The present invention relates to a method, a system and apparatuses for transferring data on a bitstream in a circuit switched time division multiplexed network, wherein said bitstream is divided into frames, each frame is divided into time slots, and said time slots are divided into control slots and data slots, and wherein an isochronous channel, comprising one or more data slots within each cycle of said bitstream, has been established between a first node and a second node of said network. According to the invention, said bitstream is provided with data distinguishing each data slot, within said channel, that contains non-valid data as a result of said first node not being able to transmit valid data into said each data slot.