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1
Content available Performance Analysis of VoIP Data over IP Networks
Strzęciwilk Dariusz
International Journal of Electronics and Telecommunications
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2021
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Vol. 67, No. 4
743--750
EN
The paper presents the results of research and analysis of voice data transmission quality in IP packet networks. It analyses mechanisms allowing for the assessment of packet telephony data transmission quality. Possible transmission quality levels and adequate quality metrics, applicable in the recommendations of standardisation organisations, as well as suggested limit values conditioning acceptable voice data transmission quality were indicated and discussed. A packet network model was designed and tested, taking into account VoIP architecture supporting various audio codecs used for voice compression. Transmission mechanisms based on audio codecs G.711, G.723, G.726, G.728 and G.729 were investigated. It was shown that for delay-sensitive traffic which fluctuates beyond its nominal rate, selected codecs have an advantage over others and allow for better transmission quality of VoIP traffic with guaranteed bandwidth and delay.
2
Content available Transmission Quality Measurements in DAB+ Broadcast System
Gilski P., Stefański J.
Metrology and Measurement Systems
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2017
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Vol. 24, nr 4
675--683
EN
In the age of digital media, delivering broadcast content to customers at an acceptable level of quality is one of the most challenging tasks. The most important factor is the efficient use of available resources, including bandwidth. An appropriate way of managing the digital multiplex is essential for both the economic and technical issues. In this paper we describe transmission quality measurements in the DAB+ broadcast system. We provide a methodology for analysing parameters and factors related with the efficiency and reliability of a digital radio link. We describe a laboratory stand that can be used for transmission quality assessment on a regional and national level.
3
Content available Examination of Transmission Quality in the IP Multi-Protocol Label Switching Corporate Networks
Strzęciwilk D.
International Journal of Electronics and Telecommunications
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2012
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Vol. 58, No. 3
267-272
EN
The paper presents the examination of quality of transmission designed and built based on IP/MPLS technology as well as BGP and OSPF routing protocols of corporate network. It indicates the factors forming and affecting the service quality in IP network, including QoS support network architecture, particularly the architecture of DiffServ differentiated services. Main problems occurring in these architectures have been discussed. The analysis of data and voice transmission via IP network of Best Effort architecture and in Differentiated Service architecture of differentiated transmission quality have been conducted. It has been presented that the MPLS technology may be effectively applied in building corporate networks requiring network services of highest quality parameters with lossless packet transmission and maximum delay guarantee.
4
Content available Pomiary stopy błędów urządzeń cyfrowych linii radiowych
Bogucki J.
Telekomunikacja i Techniki Informacyjne
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2006
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nr 1-2
84-93
PL
Rozpatrzono zagadnienie pomiaru cyfrowych urządzeń horyzontowych linii radiowych. Przedstawiono sposób pomiaru stopy błędów urządzeń, ze szczególnym zwróceniem uwagi na badanie własnej i szczątkowej elementowej stopy błędów.
EN
This article describes measurements of terrestrial digital line-of-sight radio links equipment. The measurement methods of bit error rate are described particularly paying attention to test of background and residual bit error rates.
5
Elementowa i ramkowa stopa błędów cyfrowych linii radiowych
Bogucki J., Wielowieyska E.
Elektronika : konstrukcje, technologie, zastosowania
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2003
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Vol. 44, nr 1
6--9
PL
Omówiono podział systemów telekomunikacyjnych na PDH i SDH, oraz transmisje sygnałów cyfrowych linii radiowych. Przedstawiono wymagania na jakość transmisji cyfrowych linii radiowych, uwzględniając wprowadzane ostatnio wymaganie na ramkową stopę błędów.
EN
The article describes PDH and SDH telecommunication systems and transmission signals in terrestrial line-of-sight radiolinks. The transmission quality of radiolinks and compliance to lately introduced requirements of frame error ratio are described.
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