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Management of household appliances and the services have been complicated by increasing of network devices recently. Therefore, Home Gateway (HGW) which manages them intensively has been expected as new consumer electronics. However, HGW has not been popular in our life because the installation cost of HGW is expensive compared with the benefits of services. In this study, we propose new home network...
Spanning tree protocol (STP) is a link layer protocol used for link management, prevention of loop formation etc. in the network. Although STP is widely used, it is still prone to many kinds of attacks that exploit the lack of security features both in basic working process and STP packet format. By exploiting STP control packet an attacker can pretend to be the new root in STP domain and perform...
A group of multiple peers are required to cooperate with each other in distributed peer-to-peer (P2P) applications. Here, messages have to be causally delivered to every peer. In our approach to realizing a scalable P2P group, messages are ordered by taking advantage of linear time (LT) and physical time (PT) since message length is O(1). Here, each peer has to hold information on clock accuracy of...
This paper investigates various Ethernet LAN architectures for substation automation system applications with protection, control, monitoring data flows and their performance requirement. The paper discusses conceptual architecture designs and related redundancy technologies such as RSTP, PRP and HSR protocols. The suitability of these architectures and the redundancy technologies for mission-critical,...
Substation Automation Systems (SAS) offer powerful, fast, and viable ways to design, automate, and implement substation protection, control, and monitoring functions in modern transmission and distribution grids. Today's SAS — ore than ever — rely on the adoption of IEC61850 as a worldwide standard for interoperability and dependable peer-to-peer and substation communications. Being based on the Ethernet...
In this paper, the performance of Gigabit Ethernet is evaluated using Windows Vista and Windows Server 2008 as operating systems. Maximum bandwidth achieved for Gigabit Ethernet was approximately 700Mbps that is much lower than the theoretical limit of 1000Mbps.
Today, communications technology is one of the most essential roles for our life. People had used many ways of transmissions such as internet, mobile phone and so on. Moreover, VoIP (Voice over Internet Protocol) is also a communications technology. In this paper, we focus on VoIP which transmits voice over packet switched networks such as LANs (Local Area Networks) or WANs (Wide Area Networks). Adding...
Ethernet is becoming a preferred technology to be deployed in metro domain due to its low cost, simplicity and ubiquity. Nevertheless, Ethernet was originally designed as a LAN technology; therefore, it lacks fast fault-protection which is very important in the new real-time applications. On the other hand, most of the failure recovery algorithms proposed in literature are offline in nature or they...
Randomized agreement protocols have been around for more than two decades. Often assumed to be inefficient due to their high expected communication and computation complexities, they have remained overlooked by the community-at-large as a valid solution for the deployment of fault-tolerant distributed systems. This paper aims to demonstrate that randomization can be a very competitive approach even...
Most of current ring-based Ethernet protection schemes work on a basis of filtering database (FDB) flush operation to guarantee data forwarding on protection switching. However, when a link or node failure occurs in a congested ring network, delayed data frames that have lower priorities than control frames can cause the FDB inconsistency problem that ring nodes build incorrect FDB information. Under...
Network traffic has been studied extensively since new findings by Taqqu et. al. (1994), which has shown that network traffic is not memoryless. Such traffic has been called self similar with Long Range Dependence (LRD) and their distribution is commonly known as heavy-tailed. It is very hard to estimate buffer size to protect against overflow in presence of such traffic as packet sizes and their...
Through analyzing the characteristics of EPA (Ethernet for plant automation) Deterministic Communication Scheduling, this paper proposes a dynamic priority scheduling strategy, using dynamic priority upgrade mechanism so that the priority of the packet waiting time changes with the dynamic changes, and designs a dynamic priority scheduling algorithm, communication scheduling control algorithm and...
The Industrial Ethernet is promising for the implementation of a Cloud Computing based control system. However, numerous standard organizations and vendors have developed various Industrial Ethernets to satisfy the real-time requirements of field devices. This paper presents a real-time reconfigurable protocol stack to cope with this challenge, by introducing the architecture with a core of dynamic...
A number of research efforts are made for transmission of real-time traffic over the Ethernet network because of growth of digital media devices. Standardizations of network techniques for real-time traffic over Ethernet are in progress in IEEE 802.1 AVB TG. In this paper, Active MSRP which is based on IEEE 802.1Qat-a bandwidth reservation method-was proposed. In various reservation scenarios, Active...
Recently, more and more services need high quality bandwidth. In order to satisfy those services, high-speed networks are needed. The Task Force team of IEEE 802.3ah set a standard as Ethernet Passive Optical Network (EPON) that is a next generation subscriber access network. IEEE 802.3av developed 10G EPON which has 10 times more capacity than EPON to solve the high quality problem. Research on 10G...
This paper presents a unicast and multicast solution to delivery digital television (DTV) services over Ethernet. In our solution, a new protocol stack is proposed to help implementation of DTV services over Ethernet link. We merged several key protocols: NHRP, RSVP, SBM and GMRP to realize unicast and multicast in our protocol operation. A simple quality of service (Qos) structure is provided in...
The AFDX (Avionics Full DupleX Switched Ethernet) network simulation is an effective tool for AFDX network technology and performance research. Based on the established AFDX end system, switch and virtual link simulation models, the AFDX network simulation system is implemented on NS2 (Network Simulation 2) network simulation platform. The key algorithm of each simulation model is designed in detail...
ICx Radiation, Inc. has implemented a novel timing method for use in a Compton telescope that is capable of nanosecond timing resolution. A critical task in Compton telescope design is to minimize the timing variance between detectors in a large array in order to reduce the background. The voxelSPEC has been developed to combine precise timing with pulse processing electronics in a single device,...
Using the Precision Time Protocol (PTP) specified by the IEEE 1588 standard, synchronization of distributed clocks is achieved by propagating the timing information of a preselected master clock throughout the entire network. Based on this directly or indirectly obtained noisy timing information, each slave clock tries to follow as closely as possible the master time. This paper formulates the PTP...
Nowadays, most IPTV senders provide all of their multiple streaming channels under IPv4 protocol, in dedicated networks, which are high bandwidth but costly and having geographically limited number of subscribers located relatively close to IPTV senders. Due to the increase of Internet bandwidth, IPTV providers seem to offer incredibly better television standard with HD IPTV. In this paper we adopt...
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