84 research outputs found
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
Optimistic Hard Real Time Analysis of Connectionless Self Similar Traffic in ATM Networks
Network parameters were referred and background traffic types reference traffic background network utilization and number of hop connections. This paper describes Asymmetric digital subscriber simulation model developed using ADSL. ADSL is integrated with IP and ATM in order to provide QOS using this model a comparison study between network using IP and ATM over ADSL is provided. In general all the proposed schemes solve many of the fundamental issues faced by optical burst switching networks thereby making more practical and efficient in the near feature. Finally the proposed algorithm were fed with this information and from their outcome we derived our results and conclusions
The design and analysis of a corporate data network supporting a real-time clinical data application
In this study a design is proposed for a corporate, data network supporting real-time data applications. The proposed network incorporates both Local Area Network and Wide Area Network technologies to form a system capable of supporting a variety of applications. Multimedia software, like desktop video conferencing, IP telephony, and video streaming are becoming more pervasive. Since multimedia applications depend on active human involvement and perception, they are commonly referred to as real-time. The content of real-time applications relies on the timely and consistent delivery of information. If real-time applications experience any variation in information delivery, usually referred to as jitter, the result is unacceptable application performance. However, real-time applications are not solely limited to traditional multimedia. Interactive client-server based data applications also fall into this category. This project will specifically focus on the performance of a real-time clinical application, which has become predominant in the healthcare industry. To support the implementation of the proposed network, empirical data was gathered from system testing. Testing involved comparing the performance of a real-time application on the proposed design, against the current architecture. The result found that the proposed data network design reduced transport latency, allowing the real-time application to perform more efficiently
Communication Architecture For Distributed Interactive Simulation (CADIS): Rationale Document Draft
Report on necessary communication system protocol data unit standards which must be accepted and adopted for supporting distributed interactive simulation
Resources Optimization For Distributed Mobile Platforms In Smart Cities
This thesis is focused on the study and design of techniques able to optimize resources in distributed mobile platforms. It is related to a smart city environment, in order to enhance quality, performance and interactivity of urban services. The subject is the computation offloading, intended as the delegation of certain computing tasks to an external platform, such as a cloud or a cluster of devices. Offloading the computation tasks can effectively expand the usability of mobile devices beyond their physical limits and may be necessary due to limitations of a system handling a particular task on its own.
The computation offloading within an ecosystem as a urban community, where a large amount of users are connected towards even multiple devices, is a challenging subject. In a very close future, smart cities will be peculiar sources of intensive computing tasks, since they are conceived as systems where e-governance will be not only transparent and fast, but also oriented to energy and water conservation, efficient waste disposal, city automation, seamless facilities to travel and affordable access to health management systems. Also traffic will need to be monitored intelligently, emergencies foreseen and resolved quickly, homes and citizens provided with a wide series of control and security devices. All these ambitious aspirations will require the deployment of infrastructures and systems where devices will generate massive data and should be orchestrated in a collective way. In this context, the computation offloading is an operation dealing with the optimization of urban services, in order to reduce costs and consumption of resources and to improve the connection between citizens and government.
This dissertation is organized in three main parts, dealing with the optimization of the resources in a smart city from different points of view
Communication Architecture For Distributed Interactive Simulation (CADIS): Military Standard (draft)
Report establishes the requirements for the communication architecture to be used in a distributed interactive simulation, including the standards and the recommended practices for implementing the communication architecture and the rationales behind them
Supporting distributed computation over wide area gigabit networks
The advent of high bandwidth fibre optic links that may be used over very large distances
has lead to much research and development in the field of wide area gigabit networking. One
problem that needs to be addressed is how loosely coupled distributed systems may be built over
these links, allowing many computers worldwide to take part in complex calculations in order
to solve "Grand Challenge" problems. The research conducted as part of this PhD has looked
at the practicality of implementing a communication mechanism proposed by Craig Partridge
called Late-binding Remote Procedure Calls (LbRPC).
LbRPC is intended to export both code and data over the network to remote machines for
evaluation, as opposed to traditional RPC mechanisms that only send parameters to pre-existing
remote procedures. The ability to send code as well as data means that LbRPC requests can
overcome one of the biggest problems in Wide Area Distributed Computer Systems (WADCS):
the fixed latency due to the speed of light. As machines get faster, the fixed multi-millisecond
round trip delay equates to ever increasing numbers of CPU cycles. For a WADCS to be
efficient, programs should minimise the number of network transits they incur. By allowing the
application programmer to export arbitrary code to the remote machine, this may be achieved.
This research has looked at the feasibility of supporting secure exportation of arbitrary
code and data in heterogeneous, loosely coupled, distributed computing environments. It has
investigated techniques for making placement decisions for the code in cases where there are a
large number of widely dispersed remote servers that could be used. The latter has resulted in
the development of a novel prototype LbRPC using multicast IP for implicit placement and a
sequenced, multi-packet saturation multicast transport protocol. These prototypes show that
it is possible to export code and data to multiple remote hosts, thereby removing the need to
perform complex and error prone explicit process placement decisions
Structured Backbone Design of CNs
Outline 1. Enterprise Backbone Basics 2. Structured Cabling 3. Types of Backbones 4. Backbone Examples 5. The Network Development Life Cycle (NDLC
Journal of Telecommunications in Higher Education
In This Issue
6 Meeting Bandwidth Challenges on Campus
12 Voice-over-LAN: A Solution for Convergence in the Enterprise
20 Going Beyond Best Effort IP Networking
25 The Politics of Convergence
32 Pursuing the Promise of the Paperless Office
38 New Visions for University Cellular Service
44 Maintaining Excellence at UM
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