THE ANALYSIS AND SIMULATION OF VOIP

Transcription

1 ENSC 427 Communication Networks Spring 2013 Final Project Presentation THE ANALYSIS AND SIMULATION OF VOIP Presented by Team #3: Demet Dilekci Conrad Wang Jiang Feng Xu

2 Overview Motivation Background Technical details Implementation in OPNET VoIP over LAN (Local Area Network ) VoIP over WAN (Wide Area Network ) VoIP over WLAN (Wireless Local Area Network) VoIP over WWAN (Wireless Wide Area Network) Discussion Result and Analysis Recommendations

3 Motivations To analyze and discuss the parameters that affect the quality of VoIP To simulate scenarios by using OPNET

4 VoIP Background Voice over Internet Protocol An Alternative to Public Switched Telephone Network Uses Packet Switching instead of Circuit Switching Digital Signal instead of Analog Signal

5 VoIP Advantages / Disadvantages Advantages: Cost Saving Flexible Rich Features Disadvantages: Network quality determines call quality Higher call drop rate compared to PSTN 911 Emergency call is unable to trace location

6 Technical Details Jitter Mean Opinion Score (MOS) End-to-end Delay Packet Loss

7 Technical details ITU Telecommunication Standardization Sector (ITU-T) Values [6] [7]: Average Quality Ideal Quality Jitter < 60 ms < 20 ms End-to-end Delay < 150 ms < 50 ms Packet Loss Rate < 5% < 1% Codec (Coder/Decoder) G. 711 Quality Scale MOS Excellent 5 Good 4 Fair 3 Poor 2 Bad 1 G. 723 G. 729

8 Implementation in OPNET VoIP over LAN (Local Area Network ) VoIP over WAN (Wide Area Network ) VoIP over WLAN (Wireless Local Area Network) VoIP over WWAN (Wireless Wide Area Network)

9 OPNET : VoIP over LAN Designs Different # of Clients (2, ) & Traffic Load (Light / Heavy) & Codec

10 OPNET : VoIP over LAN: Results Results: Jitter and MOS in office

11 OPNET : VoIP over LAN: Results Results: ETE Delay and Packet Loss in office

12 OPNET : VoIP over LAN: Discussion Discussion Increasing number of client & traffic load doesn`t effect the result Jitter in good for all codec types 711 gives better values (Mos close to good level) 729 Mos : fair level. It is below good 723 Mos & packet end-end delay: fair level 723 send less voice traffic

13 OPNET: VoIP over WAN Design 1 # of Clients: 20 & Different Traffic Load (Light / Heavy) & Codec & Links

14 OPNET: VoIP over WAN Design 2 # of Clients: 200 & Different Traffic Load (Light / Heavy) & Codec & Links

15 OPNET : VoIP over WAN: Results Results: Jitter and MOS in long distance

16 OPNET : VoIP over WAN: Results Results: ETE Delay and Packet Loss in long distance

17 OPNET: VoIP over WAN Discussion # of client : 20 Codec 711, links PPP DS0 / DS1: PPP DSO values are below acceptable level. PPP DS1 is good over all (MOS is between good and fair level) Codec (711, 729, 723), link PPP DS1: 711: good level (MOS level close the good level) 729 and 723 MOS level: fair level 723 sent less voice traffic

18 Implementation in OPNET: WLAN / WWAN

19 Results Jitter and MOS in office

20 Results ETE Delay and Packet Loss in office

21 Results Jitter and MOS in long distance

22 Results ETE Delay and Packet Loss long distance

23 Discussion Wireless: Base on the results, we noticed that the outputs do not change much even when we set the application traffic from heavy to light. Also, when we change the connection link, the outputs do not change significantly. Comparing office and long distance communication, we noticed that the Jitter, MOS Value, Delay Variation and ETE Delay only have a slight difference. Thus, change falls into a acceptable range.

24 Recommendations VoIP has many major drawbacks that makes the call quality not as good as PSTN However, it has the most important advantage over PSTN which is the cost Use VoIP to save cost Use PSTN for important calls due to its reliability

25 References [1] J. Davidson, J. Peters, M. Bhatia, S. Kalidindi and S. Mukherjee, Voice over IP Fundamentals. Indianapolis: Cisco press, 2007 [2] "Understanding Voice over IP Protocols", 14 Feb 2013 [3] J. Middleton, "Top 11 Technologies of the Decade", IEEE Spectrum, vol 48, issue.1, pp , January 2011 [4] J. Soares, S. Neves and C. Rodrigunes, "Past, Present and Future of IP Telephony", IEEE CTRQ Conference, pp , [5] L. Chu, X. Lan, Y. Tan, "The Design and Simulation of Enterprise's VoIP Network", IEEE ICECE Conference, pp , 2011 [6] E. Chi-Pong Chan, Performance Analysis of Voice Communications in a Private Network, Ensc 835: High-Performance Networks, 2003, pp 8 [7] K. Alutaibi, Performance Analysis of VoIP over WiMAX and Wi-Fi Networks, Ensc 894: Communications Networks, 2012, pp. 3-4

26 Questions?