Abstract: A network device includes control logic coupled to a receiver. The network device receives, via the receiver, a packet from a second network device over a network, wherein the packet is associated with clock synchronization between the network device and the second network device. The network device determines that a congestion indicator of the packet is asserted, indicating that the packet has incurred congestion traversing the network and adjust, based on an assertion of the congestion indicator, a weight applied to timestamps associated with the packet in performing clock synchronization with the second network device.

Abstract: A network device includes control logic coupled to a receiver. The control logic detects an synchronization packet received via the receiver from a second network device over a network that is precision time protocol unaware. The control logic determines that a portion of the synchronization packet is asserted, indicating that the synchronization packet has incurred congestion traversing the network. The control logic adjusts, based on an assertion of the portion, a weight applied to timestamps associated with sending and receiving the synchronization packet in performing clock synchronization with the second network device.

Abstract: In one embodiment, a system includes clock circuitry to generate a local clock signal, the clock circuitry including an oscillator, clock synchronization circuitry to adjust the local clock signal based on a remote clock, and a processor to train a machine learning model to predict a frequency or a frequency adjustment for applying to the local clock signal during clock holdover.

Abstract: In one embodiment, a device includes a processing unit to find at least one value of at least one filter parameter using Bayesian Optimization, and provide the at least one value of the at least one filter parameter to a filter to generate an adjustment to cause clock circuitry to adjust a local clock signal or local clock based on an error signal and the at least one value of the at least one filter parameter, and a memory to store data used by the processing unit.

Abstract: Embodiments of the present disclosure are directed to synchronizing clocks across a plurality of computing devices. Generally speaking, the clocks of the plurality of devices can be synchronized to whichever of the clocks is the furthest ahead in time. More specifically, embodiments provide for determining a common time reference establishment without need for an external reference. Rather, a computing device or node with the furthest ahead in time clock among devices or nodes in a group or time domain can be become the leader node and propagate time to the other nodes. Embodiments of the present disclosure can replace the traditional one-way time transfer from the IEEE 1588 timeTransmitter to the timeReceiver with two-way communication and time transfer.

Abstract: System, methods, and devices for sharing time information between machines are provided. In one example, a system includes a Precision Time Protocol (PTP) Hardware Clock (PHC) and an application. The application receives time information from the PHC along with contextual metadata associated with the time information, analyzes the contextual metadata associated with the time information, and determines a context in which the PHC is disciplined. The context in which the PHC is disciplined may control a manner in which the application uses the time information.

Abstract: A network device includes control logic coupled to a receiver. The control logic detects an synchronization packet received via the receiver from a second network device over a network that is precision time protocol unaware. The control logic determines that a portion of the synchronization packet is asserted, indicating that the synchronization packet has incurred congestion traversing the network. The control logic adjusts, based on an assertion of the portion, a weight applied to timestamps associated with sending and receiving the synchronization packet in performing clock synchronization with the second network device.

Abstract: A system for maintaining a Precision Time Protocol (PTP) hardware clock, the system being operative in conjunction with a network device which is external to the system, the system comprising a controller to receive information characterizing a network peer oscillator frequency, wherein the information was extracted from an RX symbol rate, and to adjust the PTP Hardware Clock's frequency responsive to the information characterizing the network peer oscillator frequency.

Abstract: A system for maintaining a Precision Time Protocol (PTP) hardware clock, the system being operative in conjunction with a network device which is external to the system, the system comprising a controller to receive information characterizing a network peer oscillator frequency, wherein the information was extracted from an RX symbol rate, and to adjust the PTP Hardware Clock's frequency responsive to the information characterizing the network peer oscillator frequency.

Abstract: System, methods, and devices for sharing time information between machines are provided. In one example, a system includes a Precision Time Protocol (PTP) Hardware Clock (PHC) and an application. The application receives time information from the PHC along with contextual metadata associated with the time information, analyzes the contextual metadata associated with the time information, and determines a context in which the PHC is disciplined. The context in which the PHC is disciplined may control a manner in which the application uses the time information.

Abstract: A system is disclosed that includes two or more network elements, each comprising a Precision Time Protocol (PTP) Hardware Clock (PHC) that is adjustable based, at least in part, on physical layer frequency information.

Abstract: A system is disclosed that includes two or more network elements, each comprising a Precision Time Protocol (PTP) Hardware Clock (PHC) that is adjustable based, at least in part, on physical layer frequency information.

Abstract: Provided is an aberration corrector having a plurality of magnetic poles including a first magnetic pole and further magnetic poles, a ring that magnetically connects the plurality of magnetic poles with one another, the ring having a constant spacing to at least the first magnetic pole, a plurality of magnetic field modulators including a first magnetic field modulator and further magnetic field modulators, and a plurality of guides including a first guide and further guides; wherein the first magnetic field modulator includes a soft magnetic material, wherein the first magnetic field modulator is disposed in a first position, the first position being one of the following: adjacent to a first air gap separating the first magnetic pole and the ring, or at an inner ring surface or radially outward of the inner ring surface along an axis of the first magnetic pole, and wherein the first guide constrains the first magnetic field modulator to positions along a first axis substantially parallel to or coincident wi

Abstract: Apparatus including a shared device in communication with a plurality of computing machines external to the shared device, the shared device including at least one PTP domain coefficient storage area, the at least one PTP domain coefficient storage area receiving a PTP coefficient from a computing machine having a PTP client, and providing the PTP coefficient to a computing machine not having a PTP client. Related apparatus and methods are also provided.

Abstract: Methods, network devices and computer readable media are disclosed for replication and switching of Internet Protocol (IP) packets in professional media networks. In one embodiment, a method includes receiving, at a first node in a network configured for bit indexed explicit replication (BIER), and via a replication fabric within the network, a packet comprising a packet bit array. Each receiver of a plurality of non-BIER-enabled receivers reachable via the replication fabric is represented by a relative bit position in the packet bit array, and a respective IP address is assigned to each receiver. The method further includes determining that an intended non-BIER-enabled receiver of the packet is a local receiver of the first node, obtaining the IP address assigned to the local receiver, removing the packet bit array from the packet and forwarding the packet, without the packet bit array, to the local receiver via unicast IP forwarding.

Abstract: A method including providing a network element including an ingress port, an egress port, and a delay equalizer, providing an equalization message generator, receiving, at the ingress port, a plurality of data packets from multiple sources, each data packet having a source indication and a source-provided time stamp, determining, at the ingress port, a received time stamp for at least some of the received data packets, passing the received data packets, the source-provided time stamps, and the received time stamps to the delay equalizer, the delay equalizer computing, for each source, a delay for synchronizing that source with other sources, the equalization message generator receiving an output, for each source, including the delay for that source, from the delay equalizer and producing a delay message instructing each source regarding the delay for that source, and sending, from the egress port, the delay message to each source. Related apparatus is also provided.

Abstract: A method including providing a network element including an ingress port, an egress port, and a delay equalizer, providing an equalization message generator, receiving, at the ingress port, a plurality of data packets from multiple sources, each data packet having a source indication and a source-provided time stamp, determining, at the ingress port, a received time stamp for at least some of the received data packets, passing the received data packets, the source-provided time stamps, and the received time stamps to the delay equalizer, the delay equalizer computing, for each source, a delay for synchronizing that source with other sources, the equalization message generator receiving an output, for each source, including the delay for that source, from the delay equalizer and producing a delay message instructing each source regarding the delay for that source, and sending, from the egress port, the delay message to each source. Related apparatus is also provided.

Abstract: Methods, network devices and computer readable media are disclosed for replication and switching of Internet Protocol (IP) packets in professional media networks. In one embodiment, a method includes receiving, at a first node in a network configured for bit indexed explicit replication (BIER), and via a replication fabric within the network, a packet comprising a packet bit array. Each receiver of a plurality of non-BIER-enabled receivers reachable via the replication fabric is represented by a relative bit position in the packet bit array, and a respective IP address is assigned to each receiver. The method further includes determining that an intended non-BIER-enabled receiver of the packet is a local receiver of the first node, obtaining the IP address assigned to the local receiver, removing the packet bit array from the packet and forwarding the packet, without the packet bit array, to the local receiver via unicast IP forwarding.

Abstract: Apparatus including a shared device in communication with a plurality of computing machines external to the shared device, the shared device including at least one PTP domain coefficient storage area, the at least one PTP domain coefficient storage area receiving a PTP coefficient from a computing machine having a PTP client, and providing the PTP coefficient to a computing machine not having a PTP client. Related apparatus and methods are also provided.

Abstract: Methods and network devices are disclosed for replication and switching of Internet Protocol (IP) packets in professional media networks. In one embodiment, a method includes encapsulating a unicast IP packet with a packet bit array and forwarding the encapsulated packet via a replication fabric within a network. In this embodiment, each receiver of a plurality of receivers reachable via the replication fabric is represented by a relative bit position in the packet bit array, a respective IP address is assigned to each receiver of the plurality of receivers, and the replication fabric is adapted to store disposition information mapping a relative bit position representing one or more of the plurality of receivers to IP addresses assigned to the one or more of the plurality of receivers. An embodiment of a network device includes a processor operably coupled to a network interface and adapted to perform steps of the method.