851 research outputs found
Design mobile satellite system architecture as an integral part of the cellular access digital network
The Cellular Access Digital Network (CADN) is the access vehicle through which cellular technology is brought into the mainstream of the evolving integrated telecommunications network. Beyond the integrated end-to-end digital access and per call network services provisioning of the Integrated Services Digital Network (ISDN), the CADN engenders the added capability of mobility freedom via wireless access. One key element of the CADN network architecture is the standard user to network interface that is independent of RF transmission technology. Since the Mobile Satellite System (MSS) is envisioned to not only complement but also enhance the capabilities of the terrestrial cellular telecommunications network, compatibility and interoperability between terrestrial cellular and mobile satellite systems are vitally important to provide an integrated moving telecommunications network of the future. From a network standpoint, there exist very strong commonalities between the terrestrial cellular system and the mobile satellite system. Therefore, the MSS architecture should be designed as an integral part of the CADN. This paper describes the concept of the CADN, the functional architecture of the MSS, and the user-network interface signaling protocols
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Survey of traffic control schemes and error control schemes for ATM networks
Among the techniques proposed for B-ISDN transfer mode, ATM concept is considered to be the most promising transfer technique because of its flexibility and efficiency. This paper surveys and reviews a number of topics related to ATM networks. Those topics cover congestion control, provision of multiple classes of traffic, and error control. Due to the nature of ATM networks, those issues are far more challenging than in conventional networks. Sorne of the more promising solutions to those issues are surveyed, and the corresponding results on performance are summarized. Future research problems in ATM protocol aspect are also presented
Time Driven Priority Router Implementation and First Experiments
This paper reports on the implementation of Time-Driven Priority (TDP) scheduling on a FreeBSD platform. This work is part of a TDP prototyping and demonstration project aimed at showing the implications of TDP deployment in packet-switched networks, especially benefits for real-time applications. This paper focuses on practical aspects related to the implementation of the technology on a Personal Computer (PC)-based router and presents the experimental results obtained on a testbed network. The basic building blocks of a TDP router are described and implementation choices are discussed. The relevant results achieved and here presented can be categorized into two types: qualitative results, including the successful integration of all needed blocks and the insight obtained on the complexity related to the implementation of a TDP router, and quantitative ones, including measures of achievable network utilization and of jitter experienced on a fully-loaded TDP network. The outcome demonstrates the effectiveness of the presented implementation while confirming TDP points of strengt
Internet measurements and data study over the regional network Ciez@net
In this paper we present the most signifcant results studying the Internet network traffic measurements
obtained in Ciez@net. Ciez@net is a citizen subnet located in the village of Cieza that belongs to the
regional network of the Autonomous Community of Murcia in Spain. This subnet is one of the firsts pilot
experiences of a Digital City in Europe and the first in the Region of Murcia. The goal is the seamless
introduction of the Information Society in a medium-size population. Access to advanced electronic
information services is stimulated or subsidized for an effective penetration. These measurements will
allow a qualitative and quantitative knowledge of the network trafJic in order to achieve a most effective
network resource provisioning and Internet trafic forecasting in a real scenario. A suitable dimensioning
of the network as well as an adequate provisioning of Quality of Service to users may depend partially on
these results. Measurements were taken from a Frame Relay link connecting Ciez@net’s users to Internet
through the main node located in Murcia city. We used a promiscuous network analyzer that avoids
intelfering in the network trafic. We report results of traffic load, network pelformance, percentage
composition of trafJic by protocol and type of application, and IP packet size distribution in both, up and
down communications streams.This work was partly supported by the Spanish
Research Council under grant TIC2000- 1734-
CO3-03 and by the Fundaci6n Integra under
project 01 24
Future benefits and applications of intelligent on-board processing to VSAT services
The trends and roles of VSAT services in the year 2010 time frame are examined based on an overall network and service model for that period. An estimate of the VSAT traffic is then made and the service and general network requirements are identified. In order to accommodate these traffic needs, four satellite VSAT architectures based on the use of fixed or scanning multibeam antennas in conjunction with IF switching or onboard regeneration and baseband processing are suggested. The performance of each of these architectures is assessed and the key enabling technologies are identified
The Impact of the Internet on Telecommunication Architectures
The ever-growing popularity of the Internet is dramatically changing the landscape of the communications market place. The two separate worlds of the Internet and Telecommunications are converging. The respective advantages of the two environments are being integrated to fulfill the promise of the information super-highways. In this paper, we examine the impact of the Internet on the main telecommunication architectures, namely the IN, the TMN and TINA. There are two new tendencies for implementing telephony services in combination with the Internet: running part of the control sys tem over the Internet, or conveying both the user data and the control information over the Internet. We examine these two trends, and elaborate on possible ways of salvaging the best parts of the work achieved by the TINA-Consortium in the Internet context
QoS SOLUTIONS FORVIDEOCONFERENCING
This project is intended to gain knowledge and apply the theory leamt about the need of
QoS in videoconferencing and the various options available. Today's conferencing
applications are now IP friendly, it can run on either dedicated lines (like ISDN or
telephone lines) or IP networks. However, as most network administrators know,
conferencingapplications can wreak havoc on unprepared corporate networks. The key to
successfully deploying conferencing applications is the activation of Quality of Service
(QoS). QoS refers to a network's ability to reliably and consistently provide a certain
level of throughput and performance. QoS for conferencing typically involves network
availability, bandwidth, end-to-end delay, jitter, and packet loss. Simply stated, if the
network doesn't conform to the minimum requirements in any of these areas, the
conferences are doomed to fail. QoS can be achieved in a variety of ways, including
over-provisioning (deploying additional bandwidth), data prioritization, and the use of
QoS-enabled overlay or converged networks. Organizations have two main options for
deploying QoS within their organizations; convergence or overlay. Convergence requires
the use of QoS-capable WAN links throughout the organization. In many cases, this
requires a fork-lift upgrade and migration of all network resources, which can place
convergence out of reach of many cost-sensitive organizations. On the other hand,
overlay networks allow a step-by-step migration from a non-QoS to a QoS network
without the high cost and inherent risk of major network reconfigurations. In this way,
overlay networks are a first step toward convergenc
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