Telekomunikacja Cyfrowa : technologie i usługi
Loading...
ISSN 1505-9405
Call number
Volume
T. 10
Date
2010/2011
Description
Journal
Telekomunikacja Cyfrowa : technologie i usługi
Wydawnictwa AGH (2007-2011)
ISSN: 1505-9405
ISSN: 1505-9405
journal.volume.project
Contains
Journal Issues
Articles
Analiza usługi telewizji internetowej w Polsce
(Wydawnictwa AGH, 2010/2011) Krempa, Agata
Article shows different streaming methods used by Polish Internet Televisions. Real-time data should be sent with use of RTP/UDP protocol suite with RTCP control protocol [10]. Research on polish Internet Televisions shows that use of those protocols is very rare. Streaming method that was seen the most often is the use of RSTP Interleaved option that uses RTP/RTSP/TCP protocol suite to send real-time data. It was proposed as a solution to firewalls filtering UDP traffic [12]. The main purpose of RTCP protocol is to send periodic reports on received data. In rare cases that RTCP datagrams were seen they were not periodic reports on received data but messages that triggered RTP retransmissions [5].
Problemy wdrażania szerokopasmowych usług multimedialnych w heterogenicznych sieciach IP
(Wydawnictwa AGH, 2010/2011) Chodorek, Robert; Krempa, Agata; Pach, Andrzej R.; Chodorek, Agnieszka
For over 30 years of its existence, the Internet has evolved from traditional data networks in the largest multiservice networks. Some Internet service has been created from scratch (like e-mail), some of them (eg. television, or Internet telephony) is the adaptation of services previously implemented in specialized networks (broadcast television network, Plain Old Telephone Service - POTS, etc.). Implementation of new services is a complex issue. New services may interact with existing applications. Problems can also occur with services adapted from specialized networks - for example, due to much lower transmission quality than required. In this paper an analysis of contemporary services and requirements is described. We show problems, which occur due to the heterogeneity of multiservice network, as well as how to solve these problems.
Implementacja punktu dostępu do sieci standardu IEEE 802.11 ze wsparciem jakości świadczonych usług
(Wydawnictwa AGH, 2010/2011) Natkaniec, Marek; Kosek-Szott, Katarzyna; Pach, Andrzej R.; Staniszewski, Andrzej; Witosz, Mariusz
The paper is related to the implementation of mechanisms for providing QoS in access point based on IEEE 802.11 standard. Three different methods for providing QoS are showed: for the data link layer (using IEEE 802.11 function), for the network layer (using queuing disciplines), and for the both mentioned layers (using hybrid solution). These mechanisms allow for improving and proper control of services provisioning in IEEE 802.11 wireless local area networks.
Analiza schematów SH-GKDS
(Wydawnictwa AGH, 2010/2011) Rams, Tomasz; Pacyna, Piotr
The paper presents techniques for selective group key distribution over an unreliable broadcast channel. It provides introduction to Self-healing Group Key Distribution Schemes (SH-GKDS), including guidelines for scheme design and analysis. The most important mechanisms used in SH-GKDS are described and analysed in terms of security, scalability and system life-time.
Analiza działania strumieniujących systemów nakładkowych stosujących rozwiązania ISO Isolated Channel oraz View Upload Decoupling
(Wydawnictwa AGH, 2010/2011) Włodarczyk, Agnieszka; Wajda, Krzysztof; Staniszewski, Andrzej
The paper presents an analysis of two important overlay (peer-to-peer) streaming applications used for distribu¬tion of video streams: basic ISO Isolated Channel and enhanced - View Upload Decoupling. Theoretical investigations and illustration of efficiencies for both solutions are shown for different uplink and downlink transmission speeds. Additionally, the results using available statistical data for Polish Internet access are presented.