Show/Hide Menu
Hide/Show Apps
Logout
Türkçe
Türkçe
Search
Search
Login
Login
OpenMETU
OpenMETU
About
About
Open Science Policy
Open Science Policy
Open Access Guideline
Open Access Guideline
Postgraduate Thesis Guideline
Postgraduate Thesis Guideline
Communities & Collections
Communities & Collections
Help
Help
Frequently Asked Questions
Frequently Asked Questions
Guides
Guides
Thesis submission
Thesis submission
MS without thesis term project submission
MS without thesis term project submission
Publication submission with DOI
Publication submission with DOI
Publication submission
Publication submission
Supporting Information
Supporting Information
General Information
General Information
Copyright, Embargo and License
Copyright, Embargo and License
Contact us
Contact us
Design and development of an internet telephony test device
Download
index.pdf
Date
2003
Author
Çelikadam, Turgut
Metadata
Show full item record
Item Usage Stats
171
views
0
downloads
Cite This
The issues involved in Internet telephony (Voice over Internet Protocol (VoIP) device) can be best understood by actually implementing a VoIP device and studying its performance. In this regard, an Internet telephony device, providing full duplex voice communication over internet, and a user interface program have been developed. In the process, a number of implementation issues came into focus, which we have touched upon in this thesis. Transport layer network protocols are discussed in the concept of real time streaming applications and Real Time Protocol (RTP) is modified to use as transport layer protocol in developed VoIP device. Adaptive playout buffering algorithms are studied and compared with each other by trace driven simulation experiments with objective measures. A method to solve clock synchronization problem in streaming internet applications is presented. One way and round trip delay measurement functionalities are added to the VoIP device, so that device can be used to investigate the network characteristics.
Subject Keywords
Internet
,
VoIP
,
Internet telephony
,
Adaptive playout buffering
,
Real time protocol
URI
http://etd.lib.metu.edu.tr/upload/1223148/index.pdf
https://hdl.handle.net/11511/13841
Collections
Graduate School of Natural and Applied Sciences, Thesis
Suggestions
OpenMETU
Core
Simulation-based VoIP performance evaluation under different traffic and codec conditions
Ünlü, Berk; Schmidt, Şenan Ece; Department of Electrical and Electronics Engineering (2013)
One of today’s most popular multimedia applications that needs more investigation and optimization is Voice over Internet Protocol (VoIP). Simulation tools are essential to test existing network technologies and develop new ones. They are effectively used for network analysis and solving design and optimization problems. The focus of this thesis is an extensive simulation study to evaluate the achieved Quality of Service (QoS) support by VoIP traffic under different network topologies, traffic profiles, cod...
Performance of transport protocols for multimedia communications in wireless sensor networks
Akan, Oezguer B. (2007-10-01)
Many wireless sensor network (WSN) applications require efficient multimedia communication capabilities. However, the existing communication protocols in the literature mainly aim to achieve energy efficiency and reliability objectives and do not address multimedia communication challenges in WSN. In this paper, comprehensive performance evaluation of the existing transport protocols is performed for multimedia communication in WSN. Performance metrics such as packet delivery rate, end-to-end packet delay, ...
Design of dual-frequency probe-fed microstrip antennas with genetic optimization algorithm
Ozgun, O; Mutlu, S; Aksun, MI; Alatan, Lale (2003-08-01)
Dual-frequency operation of antennas has become a necessity for many applications in recent wireless communication systems, such as GPS, GSM services operating at two different frequency bands, and services of PCS and IMT-2000 applications. Although there are various techniques to achieve dual-band operation from various types of microstrip antennas, there is no efficient design tool that has been incorporated with a suitable optimization algorithm. In this paper, the cavity-model based simulation tool alon...
A New service architecture for IPTV over internet
Özkardeş, Merve; Schmidt, Şenan Ece; Department of Electrical and Electronics Engineering (2013)
Multimedia applications over the Internet and Internet Protocol Television (IPTV) gain a lot of attention. IPTV has a number of service requirements such as; high bandwidth, scalability, minimum delay, jitter and channel switch time. IP multicast, IMS (IP Multimedia System) Protocol and peer-to-peer approaches are proposed for implementing IPTV. However, IP multicast requires all the routers in the core network to possess multicast capability, IMS does not easily scale and P2P cannot e ciently utilize the n...
New approaches in cellular radio systems using dynamic radio channel management
Yilmaz, N; Ergul, FR (2004-10-27)
New approaches are presented to facilitate dynamic radio bandwidth management for mobile communication systems. The aim is achieve an overall high level of QoS for both handoff calls and new calls. At the same time, the utilization of wireless network resources, i.e. the revenues earned by the operator. The simultaneous satisfaction of these two conflicting interests, under varying mobility and network traffic conditions, will be difficult. However, a balanced operation could be obtained by applying two nov...
Citation Formats
IEEE
ACM
APA
CHICAGO
MLA
BibTeX
T. Çelikadam, “Design and development of an internet telephony test device,” M.S. - Master of Science, Middle East Technical University, 2003.
