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1 Demystifying QoS Peter Thompson Chief Scientist U4EA Technologies
© U4EA Technologies What is QoS? Quality of Service – many meanings Service availability –E.g PSTN backup for VoIP Service reliability –Even when subject to interference (accidental or malicious) Service observability –For SLAs
© U4EA Technologies Why is QoS Necessary? Jitter of VoIP stream mixed with TCP over a T1 link
© U4EA Technologies Why is QoS Necessary? PESQ score of G711 subject to packet loss and jitter
© U4EA Technologies QoS is Affected at Many Levels Layer 1: S/N ratio Layer 2: protocol overheads Layer 3: buffer overflow, queuing delays Layer 4: error correction, jitter buffers Layer 5: session management
© U4EA Technologies QoS: Reliable Packet-based Services Dynamic sharing of resources makes packet- based services –Flexible –Efficient –Potentially unreliable! Making packet-based services reliable requires giving the right resources to the right amount of the right packets
© U4EA Technologies Elements of QoS Admission control Packet classification Packet queuing and scheduling Allocate the right resources Identify the right packets Ensure the right amount
© U4EA Technologies Is Standard QoS Enough? Bursts for which loss and delay are increased Offered load Time Average Capacity Can manage with standard techniques e.g p
© U4EA Technologies Is Standard QoS Enough? Bursts where loss and/or delay become excessive Offered load Time Capacity Needs an advanced multi-media QoS solution Average
© U4EA Technologies Summary: Reliable IP-based Services 1.Make sure the lower layers dont cause trouble 2.Use session control to limit the amount of traffic needing protection 3.Use standard techniques (802.1p, Diffserv etc.) to protect/prioritize traffic where the average load is low 4.Look for advanced mechanisms to make efficient use of more loaded links 5.Manage the congestion where it occurs
Internet Telephony Conference and EXPO East An Overview of QoS for Multi-Service IP Networks Peter Thompson Chief Scientist U4EA Technologies Ltd.
Network Instruments VoIP Analysis. VoIP Basics What is VoIP? Packetized voice traffic sent over an IP network Competes with other traffic on the.
A Study on Quality of Service Issues in Internet Telephony IP Telephony – Applications and Services Advantages and benefits of Voice over IP Technical.
Demystifying Quality of Service (QoS). Page 2 What Is Quality of Service? Ability of a network to provide improved service to selected network traffic.
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© R. Jayanthan, K. Gunasakera 1999 Quality of Service in Multiservice Networks for Digital Economy R. Jayanthan & Kithsiri Gunasakera National IT Conference.
Dave Martin Vice President, Product Management
Analysis of QoS Arjuna Mithra Sreenivasan. Objectives Explain the different queuing techniques. Describe factors affecting network voice quality. Analyse.
© 2006 Cisco Systems, Inc. All rights reserved. Module 4: Implement the DiffServ QoS Model Lesson 4.8: Understanding WAN Link Efficiency Mechanisms.
Beyond Best-Effort Service Advanced Multimedia University of Palestine University of Palestine Eng. Wisam Zaqoot Eng. Wisam Zaqoot November 2010 November.
Example Applications needing Advanced Services Campus Focused Workshop on Advanced Networks Atlanta, GA.
Submission doc.: IEEE 11-14/0xxx March 2014 Giwon Park, LG ElectronicsSlide 1 Discussion on power save mode for real time traffic Date: Authors:
-1- Georgia State UniversitySensorweb Research Laboratory CSC4220/6220 Computer Networks Dr. WenZhan Song Professor, Computer Science.
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© 2006 Cisco Systems, Inc. All rights reserved. 3.5: Implementing QoS with Cisco AutoQoS.
Streaming Video over the Internet 1. Characteristics of Multimedia Data Voluminous they demand very high data rates, possibly dozens or hundreds of Mbps.
Playback-buffer Equalization For Streaming Media Using Stateless Transport Prioritization By Wai-tian Tan, Weidong Cui and John G. Apostolopoulos Presented.
Covilhã, 30 June Atílio Gameiro Page 1 The information in this document is provided as is and no guarantee or warranty is given that the information is.
© 2006 Cisco Systems, Inc. All rights reserved. 2.3: Encapsulating Voice Packets for Transport.
CS Spring 2009 CS 414 – Multimedia Systems Design Lecture 21 – Case Studies for Multimedia Network Support (Layer 3) Klara Nahrstedt Spring 2009.
© 2006 Cisco Systems, Inc. All rights reserved. MPLS v2.2—8-1 MPLS TE Overview Introducing the TE Concept.
Improving QoS Support in Mobile Ad Hoc Networks Agenda Motivations Proposed Framework Packet-level FEC Multipath Routing Simulation Results Conclusions.
Quality of Service CCDA Quick Reference. QoS Mechanisms QoS Bandwidth Provisioning Signaling Techniques Classification and Marking Congestion Avoidance.
AIMS’99 Workshop Heidelberg, May 1999 Linking User Acceptance and Network Performance Miles Wilkins (BT) P807 (JUPITER2)
Integrated Services (RFC 1633) r Architecture for providing QoS guarantees to individual application sessions r Call setup: a session requiring QoS guarantees.
1 Solutions to Performance Problems in VOIP over Wireless LAN Wei Wang, Soung C. Liew Presented By Syed Zaidi.
Contents Causes and cost of congestion Three examples How to handle congestion End-to-end Network-assisted TCP congestion control ATM ABR congestion control.
An End-to-End Service Architecture r Provide assured service, premium service, and best effort service (RFC 2638) Assured service: provide reliable service.
LOG Objectives Describe some of the VoIP implementation challenges such as Delay/Latency, Jitter, Echo, and Packet Loss Describe the voice encoding.
© 2006 Cisco Systems, Inc. All rights reserved. Optimizing Converged Cisco Networks (ONT) Module 3: Introduction to IP QoS.
1 Transport Layer: Basics Outline Intro to transport UDP Congestion control basics.
V. Fodor and Gy. Dan, KTH - Marholmen 2002 End-to-end control for audio-visual communication Viktoria Fodor and György Dán Laboratory for Communication.
Flow Aware Networking © 2007 Katedra Telekomunikacji AGH Flow Aware Networking Router model lead by prof. dr hab. inż. Andrzej Jajszczyk.
Voice over WiFi R 張素熒 R 朱原陞 R 王振宇 R 許雅鈴.
William Stallings Data and Computer Communications 7 th Edition Chapter 13 Congestion in Data Networks.
Adaptive Networking for Tele-Immersion Presented by: Shi Hu (u )
QoS Strategy in DiffServ aware MPLS environment Teerapat Sanguankotchakorn, D.Eng. Telecommunications Program, School of Advanced Technologies Asian Institute.
Congestion Control and Fairness Models Nick Feamster CS 4251 Computer Networking II Spring 2008.
CSE5803 Advanced Internet Protocols and Applications (14) Introduction Developed in recent years, for low cost phone calls (long distance in particular).
© 2006 Cisco Systems, Inc. All rights reserved. Optimizing Converged Cisco Networks (ONT) Module 2: Cisco VoIP Implementations.
報告人：林祐沁 學生 指導教授：童曉儒 老師 March 2, Wireless Video Surveillance Server Based on CDMA1x and H.264.
1 Interactive Multimedia Satellite Access Communications Tho Le-Ngoc, McGill University Victor Leung, University of British Columbia Peter Takats and Peter.
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Ch 6. Multimedia Networking Myungchul Kim
L.R.He, B.M.G. Cheetham Mobile Systems Architecture Group, Department of Computer Science, University of Manchester, Oxford Rd, M13 9PL, U.K.
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Reconsidering Reliable Transport Protocol in Heterogeneous Wireless Networks Wang Yang Tsinghua University 1.
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