As part of a broader organisational restructure, data networking research at Swinburne University of Technology has moved from the Centre for Advanced Internet Architecture (CAIA) to the Internet For Things (I4T) Research Lab.

Although CAIA no longer exists, this website reflects CAIA's activities and outputs between March 2002 and February 2017, and is being maintained as a service to the broader data networking research community.

Multiple Web Cameras, Two-Way Video Tranmsission

The following graphs are representative of traffic data gathered for when Computer 1 transmitted and received video to/from three, four, five then six other computers (Connections A to D). Data sent to receiving computers was automatically sent via Yahoo! for efficiency purposes. The ACK replies from the participating computers were also sent via Yahoo!. Video data sent from Computers 2 to 7 was, however, sent directly to Computer 1 and in turn, Computer 1 sent all ACKs back to Computers 2 to 7 directly.

Inter-packet Arrival Results

All packet inter-arrival graphs showed very similar characteristics regardless of the number of computers transmitting web camera video to/receiving from Computer 1.


Figure 6.1: Data Packet Flow

Figure 6.2: Data Packet Flow

Figure 6.3: Data Packet Flow

Figure 6.4: Data Packet Flow

We can see in Figures 6.1 to 6.4 that regardless of the number of computers sending web camera video to Computer 1, they all shared very similar packet inter-arrival time characteristics. 64.4 to 69.5% of data packet inter-arrival times were less than or equal to 0.25msec from Computers 1 to 7.


Figure 6.5: ACK Packet Flow

Figure 6.6: ACK Packet Flow

Figure 6.7: ACK Packet Flow

Figure 6.8: ACK Packet Flow

Figures 6.5 to 6.8 show that less than 15% of ACK packets arrived to Computer 1 with an inter-packet arrival time of less than 0.25msec (1usec to 249usec). For all connections (A to D) packet inter-arrival times were widely distributed between 100msec to 200msec with a frequency of less than 1%.


Figure 6.9: Data Packet Flow

Figure 6.10: ACK Packet Flow

We can see from Figure 6.9 that approximately 71% of data packets from Computer 1 to Yahoo! had an inter-arrival time of less than 0.25msec. Figure 6.10 is representative of the 38.1 to 43.5% of ACK packets sent from Yahoo! to Computer 1 having an inter-arrival time of less than or equal to 1msec. A distribution of peaks between 76msec to 118msec with a frequency of less than 1% also occured, as seen in Figure 6.10.



Packet Length Results

All packet length graphs showed very similar characteristics regardless of the number of computers transmitting web camera video to/receiving from Computer 1.


Figure 6.11: Data Packet Flow

Figure 6.12: Data Packet Flow

Figure 6.13: Data Packet Flow

Figure 6.14: Data Packet Flow


Figure 6.15: ACK Packet Flow

Figures 6.11 to 6.14 are representative of the 30.1 to 38.8% of data packets that were 52bytes long and 32.8 to 39.1% of data packets that were 1500bytes long, sent from computers in Connections A to D to Computer 1. Figure 6.15 shows a typical cumulative graph where 100% of packets from Computer 1 were 46bytes long (ACK packets).


Figure 6.16: Data Packet Flow

Figure 6.17: ACK Packet Flow

Figures 6.16 is representative of the 27.1 to 28.9% of packets that were 52bytes long and over 42.5 to 45% of packets that were 1420bytes long for data sent from Computer 1 to Yahoo!. Figure 6.17 is representative of the 100% of packets from Yahoo! that were 46bytes long (ACK packets).





Swinburne Homepage Site Map Search Index
 

Swinburne Copyright and disclaimer Privacy Feedback

Last Updated: Monday 28-Jun-2004 09:59:27 AEST
URL:
Maintained by: Ana Pavlicic apavlicic@groupwise.swin.edu.au
Authorised by: Grenville Armitage garmitage@swin.edu.au

IndexSearchSite MapSwinburne Home Page