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IEC 62439-3 is a standard that specifies bumpless redundancy especially in the case of multiple communication failures. Whilst designed specifically for power system applications connected in ring topologies the specification bears an import beyond that of its initial topology domain that of ring based communication structures. As an example, the smart grid initiative taking place in the power system...
While special protection systems (SPSs) often shed load, recent sophisticated remedial action schemes (RASs) reduce or terminate generation output during an emergency condition. Under certain load conditions, generation newly added to previously balanced transmission grids creates system conditions that violate accepted reliability criteria. At Southern California Edison (SCE), RAS systems are implemented...
New energy efficient network design algorithm and tool for low power consumption named MIDORI is proposed. Network is used minimum set of nodes and links which can transfer all communication traffic under QoS restriction. QoS restrictions are included hop limit, bandwidth limit reliability and stability. Set-covered problem is applied to this algorithm and all links are modeled as ??1?? for on and...
Ethernet is becoming a preferred technology to be deployed in metro domain due to its low cost, simplicity and ubiquity. However, traditional spanning tree based Ethernet protocol does not meet the requirement for metro area networks in terms of network resilience. In the work of Qiu et al. (2009), we proposed a fast spanning tree reconnection (FSTR) mechanism for metro Ethernet networks to handle...
Ethernet is widely used in Local Area Networks (LANs) due to its simplicity and cost effectiveness. Today, a great deal of effort is being devoted to extending Ethernet capabilities in order to elevate it from a LAN technology to a ubiquitous networking technology, suitable for deployment in Metropolitan Area Networks (MANs) and even in core, Wide Area Networks (WANs). Current standardized Ethernet...
This paper outlines an instance of frequency, time and data networks convergence based on Ethernet technology which can be utilized in smart grid in a cost effective manner. The basic components of this converge network are Ethernet transport, rapid spanning tree protocol (RSTP), synchronous Ethernet and precision time protocol version 2 (PTPv2). RSTP provides loop-free active network topology. Synchronous...
The following topics are dealt: networking protocols; survivable WDM mesh networks; reliable carrier Ethernet transport; network reliability; exploratory data mining; whole fiber switched p-cycles; homing architectures; reconfigurable MPLS VPN networks; robust network routing; survivable IP link topology design; service overlay network design; mobile ad hoc networks; cognitive radio network; channel...
High reliability and real-time performance is a must in the industrial control networks. This article discussed both advantages and disadvantages of traditional fieldbus, then the open standard Ethernet technology was introduced. By discussing the disadvantage of applying commercial Ethernet to industrial control networks, this article analyzed two methods to improve the reliability and real-time...
It is urgently necessary to accomplish the maintenance and testing for EPON system. Based on the analysis of related parts in IEEE802.3-2005, the paper introduces the realization of remote on-line testing. It can greatly reduce operational expenditures while increasing network availability and reliability.
The paper design a new three-rings Redundancy Industrial Ethernet system for the settlement of Industrial Intelligent based on rapid spanning tree protocol, according to the requirements of as reliability and real-time performance in the control data transmission of the three layers Frame Industrial Ethernet, analyse the method of solving the loop, apply the rapid spanning tree protocol and the multi-spanning...
The following topics are dealt with: Ethernet simulation; signal processing theory; wireless communication; communication switching; routing; distributed communication; quality of service; peer-to-peer network; telecommunication security; VoIP; mobile networking; protocols; multimedia communication; multicast communication; network management; and reliability.
Ethernet has grown since its inception by Metcalfe in 1976. Its growth as a wide-area networking technology has led to a need for operations, administration and maintenance (OAM) requirements. The expansion of this technology into the domain of service providers, where networks are substantially larger and more complex and the user-base is wider, makes the idea of robust and reliable connectivity,...
There is a need for fool proof architecture of the substation communication network (SCN) for reliable, fast and deterministic operation of the automation functions within a substation, to ensure the reliability, availability and survivability of the geographically distributed complex power network. This paper presents different types of Substation Communication Network architectures and analyzes...
In this paper we study IEEE 802.11s-based wireless local area network(WLAN) mesh interworking with external LANs. Interworking with multiple mesh portals is necessary not only for network reliability but also for load balancing and increased throughput. In case, however, two or more mesh portals connect the mesh to one external LAN segment, broadcast loops may occur and the IEEE 802.1D bridging protocol...
Ethernet communication isn't used directly in numerical control (NC) system, since its non-deterministic time delays and non-synchronous communication. In this paper, the system architecture of digital interface and the communicating- protocol of digital interface in NC system based on the Ethernet technology are made. The protocol was tested by experiment in feasibility. The results show that it...
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