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.

Two-Way Video Transmission

The following graphs represent the packet inter-arrival time and lengths captured by Computer 1 and Computer 2 transmitting video data via the web cameras simultaneously. Two flows of traffic occur for each web camera: data from the computer transmitting video and the ACK replies from the computer receiving. As a result, four flows of traffic are identified.

Inter-packet Arrival Results


Figure 3.1: Data Packet Flow

Figure 3.2: Data Packet Flow

Figure 3.3: ACK Packet Flow

Figure 3.4: ACK Packet Flow

Figure 3.1 has been cropped to show a close-up of the 67.2% of packets with an inter-arrival time of 0.25msec or less. In Figure 3.2, the corresponding cumulative graph, this results in the large initial jump to over 67%. Figures 3.3 and 3.4 show that ACKs from Computer 2 were distributed over 100msec to 200msec with less than 1% frequency and just under 2% of packets arrived with less than 0.25msec inter-arrival time.


Figure 3.5: Data Packet Flow

Figure 3.6: Data Packet Flow

Figure 3.7: ACK Packet Flow

Figure 3.8: ACK Packet Flow

We can see from Figures 3.5 to 3.8 that data sent from Computer 2 resulted in similar inter-packet arrival times as occured from Computer 1 (Figures 3.1 to 3.4). 68.5% of packets sent by Computer 2 had an inter-arrival time of less than or equal to 0.25msec. ACK replies from Computer 1 were once again spread over a 100msec to 200msec inter-arrival time distribution with less than 1% frequency. 9.4% of ACK packets from Computer 1 had an inter-arrival time of less than 0.25msec.



Packet Length Results


Figure 3.9: Data Packet Flow

Figure 3.10: Data Packet Flow


Figure 3.11: ACK Packet Flow

Over 32% of packet sent by Computer 1 were 52bytes long, with a further 35% being 1500bytes long as seen in Figures 3.9 and 3.10. We can see in Figure 3.11 that Computer 2 replied with 46byte ACK packets.


Figure 3.12: Data Packet Flow

Figure 3.13: Data Packet Flow


Figure 3.14: ACK Packet Flow

Once again, with Computer 2 transmissing video data this time, large peaks at 52bytes and 1500bytes occured. Over 31% of packets sent by Computer 2 were 52bytes long and just under 38% were 1500bytes long. As seen in Figure 3.14, Computer 1 replied to the web camera data with 46bytes ACK packets.





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