نتایج جستجو برای: passive network

تعداد نتایج: 736729  

Journal: :JCM 2012
Shen Chen Ahmad R. Dhaini Pin-Han Ho Basem Shihada Gangxiang Shen Chih-Hao Lin

Maximizing the optical network unit’s (ONU) sleep time is an effective approach for achieving maximum energy conservation in green Ethernet passive optical networks (EPONs). While overlapping downstream and upstream ONU transmissions can maximize the ONU sleep time, it jeopardizes the quality of service (QoS) performance of the network, especially for downstream traffic in case the overlapping ...

Journal: :IEICE Transactions 2010
Frank J. Effenberger Junichi Kani

This paper reviews the standardization work that has been done in question 2 of ITU-T study group 15, which is the lead group on optical access transport technology. The major topics covered are the progress in the G-PON series and the new point-to-point fiber access recommendation. Finally, a brief view of the future plan of XG-PON is presented. key words: ITU-T, optical, fiber, PON, access

2012
Hirotaka Ujikawa Takashi Yamada Takeshi Sakamoto Ken-Ichi Suzuki Naoto Yoshimoto

This article provides an analytical consideration of transmission control protocol (TCP) characteristics when under the sleep control of passive optical networks (PON) systems. We show that the TCP’s initial throughput growth is delayed by sleep control with a large round trip time (RTT), where the guard time used to make the sleep decision expires before the next packet train arrives. We model...

2005
Lixin Wang Mounir Hamdi

An optical fiber can potentially have more than 30 THz of bandwidth that can be exploited by future generation broadband ISDN networks. However, because of the mismatch between optical transmission and electronic processing, the network transmission rate cannot exceed few Gbps. One popular solution to this problem is to employ wavelength division multiplexing (WDM) by fragmenting the whole band...

2005
Marcia Zangrilli Bruce B. Lowekamp

Harnessing the complete power of grids depends, in part, on an application’s ability to adapt to changing network conditions. To this end, we are interested in monitoring available bandwidth of the underlying grid networks in the most accurate and least obtrusive way. Available bandwidth is either measured by actively injecting data probes into the network or by passively monitoring existing tr...

2009
K Radhakrishna Rao

Understanding analog circuit design primarily invloves becoming familiar with passive RC and RLC networks. This is due to the fact that circuit essentially involves active elements embedded in a network of parasitics: resistors, inductors and node capacitors. Other important signal processing circuits which are made up of passive elements are attenuators, ADCs and R-2R ladder networks in DACs. ...

Journal: :Computer Communications 2006
Xiaofeng Bai Abdallah Shami Chadi Assi

Ethernet passive optical networks (EPONs) technology has emerged as a promising candidate for next-generation broadband access networks. As this technology evolves, the development of efficient dynamic bandwidth allocation (DBA) algorithms has become a key concern. This paper devises and presents the principle and implementation issues of a new robust DBA scheme. This proposed scheme consistent...

اداوی, مهدی, رافعی, علی, رودباری, مسعود , صالحی, مسعود, عسگری, فرشته ,

  Background : Diabetes and hypertension are from important non-communicable diseases in the world and their prevalence are very important for health authorities. The objective of this study was to compare the predictive precision of joint logistic regression (LR) and artificial neutral network (ANN) in concurrent diagnosis of diabetes and hypertension.   Methods : This cross-sectional study wa...

2014
Michael Z. Q. Chen

Introduction An n-port resistive network is an n-port circuit consisting of only passive resistors, which is an important class of passive networks. An n-port resistive network is usually characterized by its impedance or admittance matrix. Since there are no reactive elements, passivity and reciprocity imply that the impedance and admittance matrices of n-port resistive networks must be nonneg...

2013
Xiuchao Wu Kenneth N. Brown Cormac J. Sreenan Pedro Alvarez Marco Ruffini Nicola Marchetti David B. Payne Linda Doyle

10-Gigabit-capable Passive Optical Network (XG-PON), one of the latest standards of optical access networks, is regarded as one of the key technologies for future Internet access networks. In this paper, we propose and discuss the design and implementation of an XG-PONmodule for the NS-3 network simulator. The aim is to provide a standards-compliant, configurable, and extensible module that can...

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