Patent application number | Description | Published |
20100020829 | METHOD FOR CLOCK RECOVERY USING UPDATED TIMESTAMPS - A method and mechanism for adaptive clock recovery of a service clock of a constant bit rate (CBR) service transmitted as a stream of packets over a packet network from a sending end node to a receiving end node via at least one intermediate node. The intermediate node associates the data packets relating to the CBR service with updated timestamps generated by a second reference timing signal available in the intermediate node. When recovering the service clock in the receiving end node, an adaptive clock recovery mechanism uses the updated timestamps to derive an estimated service clock, thereby reducing the effect of network-caused packet delay variation on clock recovery. | 01-28-2010 |
20120287948 | CONFIGURATION OF SYNCHRONISATION NETWORK - Configuring a node ( | 11-15-2012 |
20130010813 | Method and Apparatus for Optimizing Packet Timing Transport - There is provided a method of optimizing timing packet transport in a network node, the method comprising using a locally available stable frequency reference at the network node to provide a pre-determined network node transit time for timing packets in at least one direction into or out of the network node. There is also provided a network node comprising a locally available stable frequency reference and circuitry adapted to apply a pre-determined network node transit time, L, to all timing packets transiting the network node in at least one direction into or out of a network node dependent on the locally available stable frequency reference. | 01-10-2013 |
20130039220 | CONFIGURATION OF SYNCHRONISATION NETWORK HAVING SYNCHRONIZATION TRAILS FOR TIME SYNC AND FREQUENCY SYNC - Configuring a node ( | 02-14-2013 |
20130145041 | Optimizing Timing Packet Transport - The invention relates to networking in general and in particular to an improved packet timing transport mechanism. The present invention provides a method of optimizing timing packet transport in a network comprising a first network node connected to a second network node. The method comprises forwarding a timing packet received at the first network node to the second network node, and transmitting the timing packet from the second network node a pre-determined duration K after receiving the timing packet at the first network node. | 06-06-2013 |
20130202291 | DETERMINING ASYMMETRIES IN A COMMUNICATION NETWORK - A method for measuring asymmetry in propagation delay of first and second links which connect a first node to a second node of a communication network. The method comprises measuring ( | 08-08-2013 |
20130315606 | DISTRIBUTING CLOCK SYNCHRONIZATION INFORMATION WITHIN AN OPTICAL COMMUNICATIONS NETWORK - A method and system of distributing clock synchronization information within an optical communications network including a plurality of network elements, in which a first network element receives an ingress clock synchronization message, the ingress clock synchronization message including a clock synchronisation message identifier and a correction field. The first network element inserts the clock synchronisation message identifier into an optical channel frame overhead and inserts the ingress clock synchronisation message into an optical channel frame payload. The first network element transmits the optical channel frame overhead and the optical channel frame payload to a second network element, and determines a transit time of the clock synchronisation message identifier across each of the network elements. The second network element updates the correction field of the ingress clock synchronisation message with said transit times to form an egress clock synchronisation message. | 11-28-2013 |
20140079409 | METHODS OF TIME SYCHRONISATION IN COMMUNICATIONS NETWORKS - A method 10 of providing a path delay asymmetry for time synchronization between a master clock at a first client node and a slave clock at a second client node across a server communications network. The method comprises: mapping a first time protocol signal (TPS) carrying master clock time protocol data onto a first transmission signal, determining a forward mapping delay, d | 03-20-2014 |
20140219651 | Apparatus and Method for a Passive Optical Network - A passive optical network comprises a first node configured to transmit a downlink data signal over a communication channel of an optical link, the communication channel having a first wavelength, and a second node configured to transmit an uplink data signal over the optical link using the communication channel having the first wavelength. The first node and/or the second node is adapted to perform at least one monitoring measurement on the communication channel having the first wavelength, and provide monitoring information, comprising the at least one monitoring measurement, in a monitoring channel. Common public radio interface (CPRI) traffic can therefore be transported over an optical transport network (OTN), by using a frequency reuse technique to provide a symmetrical bi-directional communication link between a first node and a second node, and using a frame structure of the optical transport network to provide a monitoring channel. | 08-07-2014 |