TTMER34: VoIP traffic measurement on ADSL line
Measurement report
Measurement is made by:
............................................
............................................
Date of the measurement: ......................
Name of the teacher: ......................
Parts written in italic are recommendations of the theacher.
Measurement tasks
Kötelezően elvégzendő mérési feladatok:
Document phenomena during the measurement, and if it is possible, collect data with the
help of inserting a screenshot, log file, or a graph to the recordings! Justify your
statements with measuring results in every case!
1. Preparation of the VoIP connection
- 1.1 Check, if the hardware and software elements necessary for the measurement
are available at the measuring station! If there are not any, install the missing
softwares!
- 1.2 Check the operability of the tools! Try to use the telephone! Check LEDs at
the DSL terminal!
We do not use a table telephone in the currect version of the measurement, thus
it is not necesary to check its presence and operability.
Since we will make measurement through an ADSL-link, forbid or unplug the other
network interface!
- 1.3 Measure, which transmission rate was configured to the DSL line (line and
transmission rate, to up and down directions)! Check the gained result in the
DSLAM!
Use a public speed test available at the Internet during the measurement!
What could cause the experienced difference?
- 1.4 Enter to the Skype with the login name/password pair "vill.meres/meres5"!
- What kind of identifier(s) are on the "Contacts" list?
- What is the network address of the node, with that the client will get into
connection first?
To determine it, it is worth to switch off Skype, empty the data tables
belonging to the network interfaces (right click on the given network interface,
then select "Repair"), and after that restart Skype.
2. Establishment of a VoIP connection
- 2.1 Check your identifier with calling the echo service, save it, and compare
the outward and inward traffic!
- 2.2 If it is necessary, configure your terminal, so that a minimum echo could be
exprienced, and describe details of the setting!
- 2.3 Initiate a call with another workstation used in the measurement.
You may use here your own identifier, or ask teacher for help!
- 2.4 Evaluate the established telephone connection on the basis of the human
perception from a subjective point of view, and from the viewpoint of the network
traffic on the basis of technical aspects!
- What are the addresses of the nodes of which Skype client process a larger
traffic?
- How large bandwidth does a Skype-call take up?
- Determine with the help of the Skype Tracer, what identifier is assigned to
the given call by the Skype?
- Redirect the voice patterns prepared in advance to the input of the call! What
can we say after that about the codec used by the Skype?
3. Analysis of a VoIP connection at a line endured with a background traffic
- 3.1 Launching different endurances to the VoIP terminal with the traffic
generator, determine, that what an amount of endurance will impair the quality of
the connection (subjective evaluaton)!
Regulable traffic generator does not operate currently through the ADSL-link,
so you can eliminate this point!
- 3.2 With what an amount of endurance will the quality degradation of the
connection become disturbing, or unusable?
- 3.3 Generate a VoIP connection in case of natural endurance (download, web
browsing, or both of them at the same time)!
Torrent downloading currently does not work through the ADSL-link Search for a
bigger file for the dowloading
- 3.4 Evaluate the obtained results!
4. General evaluation
- 4.1 Describe, how much applicable is an ADSL connection for a VoIP-connection!
What are the requirements towards the DSL-provider? Can these criteria be
fulfilled in reality? Justify your answer!
Facultative measurement tasks:
In case of a perfect test and good measurement results it is enough to fulfil only one facultative task for the excellent mark, which will be chosen by the teacher.
- F.1. Initiate a call with the Windows Live Messenger installed in advance with
another user given by the teacher! Endure the line with a background traffic!
Evaluate the generated telephone connection on the basis of the human perception
from a subjective point of view, and from the viewpoint of the network traffic on
the basis of technical aspects!
- F.2. Make a recommendation for a task to the teacher, which is in connection with
issues occurred so far, but has not been in the measurement yet! Measure the
recommendation given by yourself!