Patent
Time synchronization, deterministic data delivery and redundancy for cascaded nodes on full duplex ethernet networks
TLDR
In this article, a method and circuit for precisely synchronizing clocks in separate nodes on a communication network is provided by adjusting timestamps and related data in network messages, allowing a daisy-chain connection of the nodes and will forward time synchronization frames while accounting for delays in a manner that does not use boundary clocks, but does not depart from the IEEE 1588 standard protocol.Abstract:
A method and circuit for precisely synchronizing clocks in separate nodes on a communication network is provided by adjusting timestamps and related data in network messages. The circuit will allow a daisy-chain connection of the nodes and will forward time synchronization frames while accounting for delays in a manner that does not use boundary clocks, but does not depart from the IEEE 1588 standard protocol. The delays will be added on the fly to synchronization packets and the IP checksum and frame CRC will be adjusted. Deterministic data delivery and redundant data paths are also provided in a full duplex Ethernet network.read more
Citations
More filters
Patent
Synchronization of timestamps to compensate for communication latency between devices
TL;DR: In this paper, the authors propose a protocol analyzer system that enables synchronization of timestamps and the capture of data across serially chained boxes that are used together to monitor and capture network data.
Patent
Step time change compensation in an industrial automation network
TL;DR: The CIP Sync solution can be part of Ethernet/IP and can be based on standard UDP (User Datagram Protocol) and/or IEEE 1588 (Time Synchronization) Ethernet technology as discussed by the authors.
Patent
Synchronization of time in a mobile ad-hoc network
TL;DR: In this article, a local timing reference is adjusted according to measured errors in incoming control packets so that time slotted transmissions can be scheduled without collisions with other nodes without the requirement for separate messaging.
Patent
Systems and methods for packet based timing offset determination using timing adjustment information
Med Belhadj,Hojjat Salemi +1 more
TL;DR: In this paper, a system and methods for performing timing offset and or fractional frequency offset for the purpose of time and/or frequency synchronization are provided, where timing packets are exchanged between a master device and a slave device and timing adjustment information is received by the slave device.
Patent
Enhancement of IEEE 1588 synchronization using out-of-band communication path
TL;DR: In this paper, a system includes at least two IEEE 1588 nodes and the nodes are connected by two paths: a low latency communication path and a high bandwidth path, where data and timing are transmitted on the high-bandwidth path while critical timing signals are passed on the low-latency communication path.
References
More filters
Patent
Time-scheduled and time-reservation packet switching
TL;DR: In this article, the authors describe a set of systems, methods, devices, processes, procedures, algorithms, networks, and network elements for time-scheduled and/or time-reserved dat networks.
Patent
Method for transmitting time information via a data packet network
TL;DR: In this article, the transmission time and the calling time information are aligned with respect to one another in time by a transmission signal which is generated by the time information source or by the data packet transmission module.
Patent
Method of dynamic prioritization of time sensitive packets over a packet based network
TL;DR: In this article, the authors propose an apparatus for and a method of dynamically prioritizing packets over a packet based network, where packets are dynamically prioritized on the basis of their "time to live" in the network as they travel from one network entity to another.
Patent
Method and apparatus for placing a timestamp in a frame
William T. Hatley,Roy Liang Chua +1 more
TL;DR: In this paper, a timestamp signature having a timestamp subfield of initialized data and a corrector subfield is embedded in the first portion during processing thereof at the selected protocol layer.
Patent
Fast frequency adjustment method for synchronizing network clocks
TL;DR: In this paper, a method of precisely synchronizing clocks held in separate nodes on a communication network is provided that adjusts clock frequency based on a measure of relative clock rates and absolute clock offsets.
Related Papers (5)
Standard for a Precision Clock Synchronization Protocol for Networked Measurement and Control Systems
Kang B. Lee,J Eldson +1 more