Ethernet Access Networks Research Articles

Software-Based Validation of the Differentiation Scheme for Ethernet and Wireless LAN Access Network Types Using an End-to-End Approach

Different access network types are characterized by a variety of attributes which include link bandwidths, physical media, capacity, and reliability. Therefore, the question of accurately identifying whether the sender uses a wired ethernet connection or a wireless LAN connection comes into place. This article aims to analyse, simulate, validate, and improve the existing classification scheme which is based on measuring entropy of packet pair inter-arrival times and median. A riverbed modeller (former OPNET) is used for simulating the different scenarios. Small-scale experiment conducted on campus at the Nazarbayev University (NU) validates the insignificance of the packet probe size chosen for the classification.

In-Home PLC Coexistence with Wi-Fi and Ethernet access Networks

BPL or PLC is relatively a new technology that is considered an attractive system to deliver broadband communications over power lines. The main objective of paper is to understand the impact of in-home PLC devices in case of integrated environment with other technologies. Initially, FTW Simulator for channel transfer function analysis of an in-home PLC network topology is used. Furthermore, through measurements conducted in laboratory environment different scenarios are built for different test scenarios and the coexistence of in-home PLC, Ethernet and Wi-Fi Networks is investigated. Toward the end of the paper, throughout different scenarios the impact on video quality of in-home PLC, will be closely monitored and evaluated.

Traffic load-based LPI control mechanism in ethernet access network

IEEE802.3az working group has recommended LPI based Energy Efficient Ethernet standard in order to efficiently reduce unnecessary waste of energy that might occur while there is no data to be transmitted. This paper proposes an enhanced LPI control mechanism to improve energy efficiency between terminal equipment and Ethernet switch in an EEE environment. The proposed mechanism measures the amount of traffic coming to the terminal during specific period of time. According to the measured traffic amount, ON and OFF duration for the following basic cycle will be decided. The performance evaluation results indicate that the suggested mechanism improves the overall performance in a way of significant reduction of energy consumption while it maintains an average packet delay to similar levels compared to the traditional method.

Enhanced token bucket policer using reduced fair queuing for Ethernet access networks

An enhanced traffic policer capable of adaptive rate control to provide fair distribution of available network bandwidth is proposed. The policer also performs maximum rate control, limiting flow's use of network resources within a pre-defined bound. Since the enhanced policer is based on a token bucket policer, a flow is guaranteed to receive service at its reserved rate. The proposed policer partially employs a reduced fair queuing algorithm, which is designed for adaptive rate control based on the perceived traffic congestion level. The adaptive rate control requires measurement of the congestion level, which is approximated through examination of local buffer usage. As a result, the allocated service rate increase provided to the flows by the policer is inversely proportional to the network congestion level. In addition, far-travelling flows in multi-hop networks receive the same service rate enhancements as short-travelling flows. The proposed scheme is useful in Ethernet networks, especially access networks, where quality of service is not well organised.

Global seamless network demonstrator: a comprehensive ASON/GMPLS testbed

This article reports on the continuous activities of Deutsche Telekom in setting up comprehensive ASON/GMPLS network demonstrators. The goal is to enable practical evaluations and early experiences with prototype implementations related to new standards and specifications from ITU-T, IETF, and OIF. Evolving from the GSN Demonstrator toward the current GSN+ Demonstrator configuration, this field testbed comprises ASON/GMPLS-based backbone network domains, as well as key client networks such as IP, Ethernet (metro and access networks), storage area networks, and broadband video applications to exemplify the wide range of network functions enabled by these new technologies. These ASON/GMPLS demonstrator activities were embedded in the OIF World Interoperability Tests and Demonstration in 2004, and are linked with the German national (VIOLA) and pan-European (MUPBED) project activities ensuring the highest level of interoperable implementations.