Tesfaye Belete and Laura Harris,Columbus State University, Columbus, GA
In this paper, we step through a fictional network optimization project in which we analyze the current network setup of a made-up company, layout several ways to improve the setup, review a couple of network protocols and routing algorithms, and submit recommendations to the company with the goal of updating the network to meet all of their current and anticipated future needs
Dijkstra’s Algorithm, Dynamic Programming, Network Topology, Open Shortest Path First (OSPF), EIGRP (Enhanced Interior Gateway Routing Protocol)
Optimizing DSCP Marking to Ensure VoIP’s QoS over HFC Network
Shaher Daoud and Yazhen Qu, Columbus State University, USA
There are three major factors that can have a significant degraded impact on the residential Voice over Internet Protocol (VoIP) phone services’ quality. These factors include packet delay, packet loss, and jitter. The focus of this study is specific to the VoIP phone services offered to customers by cable companies that utilize broadband hybrid fiber coaxial (HFC) networks. HFC networks typically carry three types of traffic that include voice, data, and video. Unlike data and video, some delays or packet loss can result in a noticeable degraded impact on a VoIP’s phone conversation. We will examine various differentiated services code point (DSCP) marking, then analyze and assess their impact on VoIP’s quality of service (QoS). This study mimics the production environment. It examines the relationship between specific DSCP marking’s configuration on the media gateway controller (MGC). This research avoids automated test calls and rather focuses on human made call testing. This study relies on users’ experience and the captured data to support this research’s findings.
QoS , VoIP, DSCP Marking , jitter, HFC Network, MOS.
Parameter Analysis Of An Existing Copper Access Network For The Optimization Of VDSL Service In Rural Areas Of The Province Of Azuay-Ecuador.
R. Carpio1, J.D.Jara2, E. Mendieta2, P. Márquez2 and JP.Bermeo2, 1Corporacion Nacional de Telecomunicaciones CNT E.P and 2Universidad Politécnica Salesiana, Cuenca, Ecuador
In this paper, we present a modeling of transmission lines performed under real-world conditions to compare them with a theoretical transfer function. This model is based on the analysis of access networks "last mile" in rural areas, designed and implemented by National Telecommunication Corporation (CNT-Ecuador) at Azuay-Ecuador, as well as we review some theoretical concepts of evolution over time in xDSL technologies implemented by the company CNT-Ecuador. We perform several field data analyses using measuring instruments, where electrical parameters were obtained with which we perform the modeling. In addition, it was realized an analysis and comparison of the obtained real capacities of transmission lines, against the theoretical ones by means of the Theorem of Shannon-Hertly for lines with VDSL technology. Into the outdoor tests and simulations, the data obtained allowed us to drastically correct the transfer functions of the lines in poor condition, through varying the most impacting electrical parameters. We present the results in a table with the ranges of the parameters that can be taken as reference so that a pair of copper wires operating in poor condition in rural areas, can work correctly with VDSL technology.
XDSL, Channel Capacity, Optimization VDSL; copper wire.