Temat: E-model - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Simple analysis of the impact of packet loss and delay on voice transmission quality
Autorzy:: Perlicki, K.
Powiązania:: https://bibliotekanauki.pl/articles/309277.pdf
Data publikacji:: 2002
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: E-model
packet network
packet loss
delay
transmission quality rating
Opis:: In this paper a simple analytical expression based on E-model is applied to analyse the impact of packet loss and delay on voice transmission quality. The relationship between overall transmission quality rating, packet loss and delay G.711, G.723 and G.729 codes is presented.
Źródło:: Journal of Telecommunications and Information Technology; 2002, 2; 53-56
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Analysis of Burst Ratio in Concatenated Channels
Autorzy:: Rachwalski, J.
Papier, Z.
Powiązania:: https://bibliotekanauki.pl/articles/309539.pdf
Data publikacji:: 2015
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: bursty packet loss
E-model
quality of experience
voice over IP
Opis:: Burst ratio is a parameter that quanties packet loss patterns in transmission networks. It has been dened for an end-to-end scenario, therefore burst ratio can be determined only if the characteristics of the whole transmission path are known. In this paper, the burst ratio parameter applicability to cases when the transmission path consists of a series of transmission channels with known packet loss rate and burst ratio values is extended. The paper also presents the results of simulations performed with NS2 software, demonstrating the validity of the burst ratio analysis. Consequently, the research makes it possible to determine the value of the burst ratio parameter in concatenated packet networks, which in turn supports delivering higher quality VoIP services.
Źródło:: Journal of Telecommunications and Information Technology; 2015, 4; 65-73
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Burst Ratio in Concatenated Markov-based Channels
Autorzy:: Rachwalski, J.
Papir, Z.
Powiązania:: https://bibliotekanauki.pl/articles/307592.pdf
Data publikacji:: 2014
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: burst ratio
bursty packet loss
E-Model
quality of service
voice over IP
Opis:: This paper deals with the burst ratio parameter, which describes the burstiness of a packet loss observed in digital networks. It is one of the input parameters of E-model – the most widely used method of assessing conversational quality of telephony. The burst ratio is defined for one channel scenario so it can be calculated when the whole transmission path has been characterized by a single set of parameters. The main objective of the paper is to extend the burst ratio definition when the transmission path is defined as a tandem concatenation of transmission channels being described by their individual burst ratios. It is assumed that packet loss of a single channel is described by a 2-state Markov chain. The final result of the research is an equation describing the burst ratio parameter when the transmission path consists of multiple concatenated channels. The derived formula has been validated by extensive simulations.
Źródło:: Journal of Telecommunications and Information Technology; 2014, 1; 3-9
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: E-resources versus traditional teaching models
Autorzy:: Stasiecka, A.
Stemposz, E.
Jodłowski, A.
Powiązania:: https://bibliotekanauki.pl/articles/308114.pdf
Data publikacji:: 2008
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: e-learning
e-resource
learning model
Opis:: The paper presents the discussion about the e-resource structure and its influence on the resources' quality. The thesis we are taking into consideration is as follows: the conformance of e-resource structure with structures suggested by traditional teaching model/models has a strong influence on the quality of this e-resource. To achieve this, the most popular teaching models are analyzed and a proposal of the metamodel useful for e-resources construction is introduced.
Źródło:: Journal of Telecommunications and Information Technology; 2008, 3; 74-81
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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