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3 2015

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The most frequent shortcomings of Wi-Fi operators

100%

Grenar M. , Filka M.

2015

tom R. 91, nr 6

129-133

This paper is focused to the most frequent shortcomings of WiFi technology operators seen by monitoring of broadband data transmission in frequency bands 2.4 GHz up to 66 GHz. The used process of measuring an evaluation of measured data summarized by the devices used by Czech Telecommunication Office for inspection and supervision is performed next. The paper is concluded by real examples of various shortcomings and mistakes.

W artykule analizowano najczęściej pojawiające się wady technologii WiFi występujące w paśmie 2.4 GHz - 66 GHz. Badano układy stosowane przez Czeski Urząd Telekomunikacji.

Timing measurement and simulation of the activation process in gigabit passive optical networks

70%

Horvath T. , Munster P. , Jurcik M. , Koci L. , Filka M.

tom Vol. 45, nr 4

459--471

The passive optical networks are widely used nowadays. Service providers have many customers in their distribution networks. The most important thing for communication between the end unit and the control unit is an establishment contact. Design and measurement of the activation process between optical network unit and optical line termination is presented. In general, the service providers have a big split ratio (up to 1:128) due to the connection eminent value of the customers per optical line termination port in chassis. We present the simulation of the connection process for 16, 32, 64, and 128 optical network units and the measurement for single optical network unit (the GPON Xpert is able to read a single connection process). We compare our results in simulation discussion.

Distributed Fiber-Optic Sensor for Detection and Localization of Acoustic Vibrations

61%

Sifta R. , Munster P. , Sysel P. , Horvath T. , Novotny V. , Krajsa O. , Filka M.

tom Vol. 22, nr 1

111--118

A sensing system utilizing a standard optical fiber as a distributed sensor for the detection and localization of mechanical vibrations is presented. Vibrations can be caused by various external factors, like moving people, cars, trains, and other objects producing mechanical vibrations that are sensed by a fiber. In our laboratory we have designed a sensing system based on the Φ-OTDR (phase sensitive Optical Time Domain Reflectometry) using an extremely narrow laser and EDFAs.