In this work, we assess the suitability of some Markovian models and their associated fitting procedures to describe IP traffic exhibiting long-range dependence. We resort to traffic traces measured at the Institute of Telecommunications – Aveiro Pole. The models under analysis are special cases of Markov Modulated Poisson Processes (MMPPs): 2-MMPP, CMPP (Circulant Markov Poisson Process) and (...

Modern wireless and mobile communication systems requires antenna which should have light weight, low profile, low cost, and easy to be integrated with RF devices. This demand is completed by microstrip antennas. This paper presents rectangular microstrip patch antenna for WLAN applications designed using IE3D software. The microstrip antenna is designed with dielectric substrate as Rogers RT/d...

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The inhospitable powerline environment necessitates data link layer protocols capable of dealing with harsh transients. This paper outlines suitable protocols for the logical link and media access control sublayers. We propose a token bus mechanism for contention, and a hybrid Automatic Repeat reQuest (ARQ) system for error control. The performance of the protocol is evaluated using an Additive...

This paper presents an indoor propagation prediction in wireless local Area Networks (WLAN).Experiments were carried out to study the Receive Signal Strength (RSS)within the test bed Area and to obtain a mathematical model that predicts the receive signal strength within the test bed area for future analysis. Results shows that RSSI = -33.5 log d 39 can be used to predict the relationship betwe...

Water is the major component of all living cells, actually it composes 70% of our bodies. Its properties, very unusual when compared to other solvents, have made possible the life that we know. Water molecules spontaneously dissociate into a hydronium (H3O þ) and a hydroxide ion (OH). This autoprotolysis is a very rare event with the average lifetime of a single H2O molecule being ;14 h (Eigen,...

Myrinet is a new type of local-area network (LAN) based on the technology used for packet communication and switching within "massivelyparallel processors" (MPPs). Think of Myrinet as an MPP message-passing network that can span campus dimensions, rather than as a wide-area telecommunications network that is operating in close quarters. The technical steps toward making Myrinet a reality includ...

The project aim is to secure the network or a LAN by implementing such a software which is enable to carry out operations which are capable to monitor whole of the network ,sitting on one chair by viewing remote desktop ,passing messages to remote system and is also able to shut down the system by performing remote aborting operations . This software is purely developed in JAVA RMI (REMOTE METH...

BACKGROUND Wireless local area networks (WLANs) are considered the next generation of clinical data network. They open the possibility for capturing clinical data in a prehospital setting (e.g., a patient's home) using various devices, such as personal digital assistants, laptops, digital electrocardiogram (EKG) machines, and even cellular phones, and transmitting the captured data to a physici...

In this paper the impact of ultra wideband (UWB) interference on IEEE802.11b WLAN performance is studied through experimental tests. Extremely high power UWB transmitters, that are not FCC compliant, were used in the tests to simulate the impact of very high UWB device concentration. The measurement setup was organized to allow the UWB transmitters to generate as much interference to the WLAN n...