Acer ISDN 128 Surf USB Bedienungsanleitung Seite 9

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Hence we have to measure below stated parameters for test quality of IP networks for real-
time depend services like as VoIP. QoS parameters are defined in recommendation
ITU-T I.350 and ITU-T Y.1541. The parameters are:
Loss rate
Throughput
Delay
Distribution of delay
Distribution of delay variation
First we will test parameters QoS. Second we will test himself voice transmission over IP
network with different voice codec. For test of voice we use Mean Opinion Score (MOS) test.
5.1 Test method of QoS
For Test of QoS i seleceted a small GNU utilities RUDE [9] and CRUDE [9]. which can
emulate different flows of packets which are similar to VoIP flows. With this utilities we can
simulate different traffic on the network and watch reactions of network. For processing of
product i selected utilities QoSplot [10] and GnuPlot [11].
5.2 About utilities
5.2.1 RUDE (Real-time UDP Data Emitter)
As the name says, this piece of program can generate UDP traffic to the network. In
configuration file we can write definition about flow for example:
Number of flow
Numbers of packets per second in flow
Numbers of Bytes in packets
Destination Address
Destination Ports
5.2.2 CRUDE (Collector for RUDE)
CRUDE is the receiver and logging utility for flows that are generated with the RUDE tool.
In the default operation mode CRUDE prints the information to standard output, so you'll have
to redirect it to file if you like to process it later on.
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