~Table 2. Localhost results
1 channel 2 channels
Protocol Latency Jitter Latency Jitter
Computer A
UDP 0.13ms 0.08ms 0.20ms 0.09ms
TCP 0.15ms 0.09ms 0.22ms 0.10ms
DCCP 0.19ms 0.14ms 0.23ms 0.13ms
SCTP 1 0.19ms 0.09ms 0.31ms 0.10ms
SCTP 2 0.21ms 0.09ms 0.35ms 0.13ms
Computer B
UDP 0.30ms 0.19ms 0.50ms 0.20ms
TCP 0.31ms 0.14ms 0.54ms 0.23ms
DCCP 0.31ms 0.14ms 0.53ms 0.17ms
SCTP 1 0.40ms 0.20ms 0.60ms 0.13ms
SCTP 2 0.38ms 0.11ms 0.69ms 0.21ms
Table 3. Crossover connection
1 channel 2 channels
Protocol Latency Jitter Latency Jitter
UDP 0.54ms 0.13ms 0.62ms 0.15ms
TCP 0.58ms 0.14ms 0.69ms 0.15ms
DCCP 0.58ms 0.14ms 0.67ms 0.18ms
SCTP 1 0.65ms 0.17ms 0.77ms 0.20ms
SCTP 2 0.66ms 0.17ms 0.78ms 0.21ms
4.1.3. Cable switch
In this scenario, a router was used to connect the computers by cable. We used a D-Link DIR-615 switch with standard CAT.5E network cables. The results for this connection are presented in Table 4. Again, there was no packet
loss.
Table 4. Switch connection
1 channel 2 channels
Protocol Latency Jitter Latency Jitter
UDP 0.72ms 0.13ms 0.81ms 0.15ms
TCP 0.73ms 0.15ms 0.93ms 0.16ms
DCCP 0.75ms 0.13ms 0.85ms 0.17ms
SCTP 1 0.82ms 0.15ms 0.94ms 0.17ms
SCTP 2 0.82ms 0.14ms 0.98ms 0.20ms
Table 5. Direct wireless connection
Protocol Latency Jitter Packet loss
1 channel
UDP 16.76ms 27.30ms 17 (0.17%)
TCP 20.12ms 33.41ms 1(0.01%)
DCCP 3.41ms 1.90ms 0
SCTP 1 21.00ms 34.85ms 0
SCTP 2 20.94ms 35.11ms 0
2 channels
UDP 20.10ms 32.08ms 30 (0.15%)
TCP 31.21ms 51.29ms 1 (0.005%)
DCCP 5.02ms 3.16ms 140 (0.7%)
SCTP 1 27.09ms 44.40ms 0
SCTP 2 26.22ms 42.40ms 0
connect both computers. The result of these measurements is presented in Table 6.
Table 6. Wireless connection with AP
Protocol Latency Jitter Packet loss
1 channel
UDP 14.73ms 17.67ms 137 (1.37%)
TCP 16.76ms 20.52ms 0
DCCP 15.65ms 18.58ms 552 (5.52%)
SCTP 1 26.39ms 35.64ms 0
SCTP 2 26.56ms 37.33ms 0
2 channels
UDP 19.99ms 24.48ms 324 (1.62%)
TCP 19.88ms 22.48ms 31(0.155%)
DCCP 14.70ms 13.26ms 1413 (7.065%
SCTP 1 67.49ms 106.79ms 0
SCTP 2 72.06ms 166.49ms 0
)
4.2. Data analysis
The previous data can be organized in two diagrams to
give a better overview of each protocol performance. Fig. 9
presents the latency and Fig. 10 presents the packet loss
for all protocols using 2 audio channels.
4.1.4. Direct Wireless
100
UDP
TCP o
DCCP o
SCTP1
SCTP2
10
1
(1-1
For the direct wireless connection, we created an 802.11 G
wireless network ("Wi-Fi") in computer A and connected
computed B in this network. Thus, the Wi-Fi connection
is direct between the two machines and there is no access points to connect them. The 802.11 G standard has
a theoretical maximum transmission rate of 54 Mb/s. The
measurement of direct Wi-Fi connection is presented in
Table 5.
4.1.5. Access Point Wireless
Our last scenario is a domestic Wi-Fi connection. A DLink DSL 2640T router was used as the access point to
U.l
Localhost-A Localhost-B Crossover Switch Direct wi-fi Access point
Figure 9. Latency draft - 2 channels.
Considering each localhost connection as one connection, in Fig. 9 we can note that the UDP protocol presented
the lowest latency in 4 out of 6 connections. DCCP presented the lowest latency in Wi-Fi connections. TCP latency varied been the highest latency in direct Wi-Fi and
the second lower using an AP. SCTP, both implementa
198 2013 ICMC
