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Three Web Cameras, Two-Way Video Transmission
The following graphs represent the traffic characteristics of packets captured when Computer 2 sent and received data to/from Computers 2 and 3. Data sent to Computers 2 and 3 was automatically sent via Yahoo! for efficiency purposes. The ACK replies from Computers 2 and 3 were also sent via Yahoo!. Video data sent from Computers 2 and 3 was, however, sent directly to Computer 1 and in turn, Computer 1 sent all ACKs back to Computers 2 and 3 directly.
Inter-packet Arrival Results
Figure 5.1: Data Packet Flow
Figure 5.2: Data Packet Flow
Figure 5.3: ACK Packet Flow
Figure 5.4: ACK Packet Flow
Figures 5.1 to 5.4 show the inter-arrival times of data packets sent directly from Computer 2 and the corresponding inter-arrival times of ACK packets sent by Computer 1.
Figures 5.1 and 5.2 inducate 68.1% of packets from Computer 2 had an inter-arrival time of less than or equal to 0.25msec. We can see from Figures 5.3 and 5.4 that a portion of the ACK replies from Computer 1 had widely distributed inter-arrival times between 100msec to 200msec. We can also see that 6.7% of ACK packets had an inter-arrival time of less than 0.25msec.
Figure 5.5: Data Packet Flow
Figure 5.6: Data Packet Flow
Figure 5.7: ACK Packet Flow
Figure 5.8: ACK Packet Flow
Figures 5.5 to 5.8 show the inter-arrival times of data packets sent directly from Computer 3 and the corresponding inter-arrival times of ACK packets sent by Computer 1. 66.4% of packets sent from Computer 3 had an inter-arrival time of less than or equal to 0.25msec. In return, only 1.2% of packets from Computer 1 had an inter-arrival time of less than 0.250msec. We can also see that once again, as in Figure 5.3, that a portion of the inter-arrival time of ACK packets was distributed between 100msec and 200msec.
Figure 5.9: Data Packet Flow
Figure 5.10: Data Packet Flow
Figure 5.11: ACK Packet Flow
Figure 5.12: ACK Packet Flow
Figures 5.9 to 5.12 show the packet inter-arrival time characteristics of Computer 1 sending data to Yahoo! and likewise, receiving ACK replies from Computers 2 and 3 via Yahoo!. We can see in Figures 5.9 and 5.10 that 72.3% of packets sent by Computer 1 had an inter-arrival time of less than or equal to 0.25msec. Figures 5.11 and 5.12 indicate that 47.1% of ACK packets had an inter-arrival time of less than 1msec. A small percentage of packets (just under 13%) had an inter-arrival time of between 85msec and 105msec.
Packet Length Results
Figure 5.13: Data Packet Flow
Figure 5.14: Data Packet Flow
Figure 5.15: ACK Packet Flow
Figures 5.13 and 5.1 show that 32.1% of packets sent by Computer 2 were 52bytes long and 36.3% were 1500bytes long. We can also see in Figure 5.15 that Computer 1 replied to Computer 2's data with 46byte ACK packets.
Figure 5.16: Data Packet Flow
Figure 5.17: Data Packet Flow
Figure 5.18: ACK Packet Flow
Figures 5.16 and 5.17 show that 33.2% of packets from Computer 3 were 52bytes long, with 33.8% being 1500bytes long. The 46byte ACK packet sent from Computer 1 can be seen in Figure 5.18.
Figure 5.19: Data Packet Flow
Figure 5.20: Data Packet Flow
Figure 5.21: ACK Packet Flow
In Figures 5.19 and 5.20 we can see that when Computer 1 sent web camera video data to Yahoo!, 27.5% of packets were 52bytes long and 45.6% were 1420bytes long. The computers receiving video data (Computers 2 and 3) replied with 46byte ACK packets.
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Last Updated: Monday 28-Jun-2004 09:59:54 AEST URL: Maintained by: Ana Pavlicic apavlicic@groupwise.swin.edu.au Authorised by: Grenville Armitage garmitage@swin.edu.au