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08 1 Telephone Networks

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08 1 Telephone Networks
Communication
Systems
8th lecture

Chair of Communication Systems
Department of Applied Sciences
University of Freiburg
2006
1 | 54

Communication Systems
Administrative stuff


Lecture on 13.06 might be called off. Please check the webpage before the lecture.



06.06, 08.06, 15.06 are holidays, no lecture, no practical.



Next practical course is on 22.06, in RZ basement -101.

2 | 54

Communication Systems
Last lectures


We started with rather modern communication technologies and introduced the Internet Protocol as a global orientated packet switching network technology


IP can be run over very different physical media and intermediate protocols



And IP is used for more and more networked services



Very popular traditional service is telephony mostly 1:1 voice communication –

With the upcoming “Voice-over-IP” we could observe a merge of both networks

3 | 54

Communication Systems
Upcoming lectures







To get an idea how traditional and modern wireless telephony networks work, we give an introduction to ISDN,
GSM and UMTS
First traditional telephony networks its history and their concepts in general
Digitization of voice - PCM
Then introduction to ISDN – a completely digitalized communication infrastructure


call setup and global routing in telephony networks

4 | 54

Communication Systems plan for this lecture


History of telephony networks and wireless information networks



Line switching



DTMF – dual tone multi frequency



Telephony protocol



Standards in telecommunication



Digital telephony networks – PCM



ISDN – Integrated Services Digital Network



D channel



DSS1 layer 3 protocol

5 | 54

Communication Systems
History of telephony networks


Traditional analogous telephony networks


1848: State Telegraphy System in Prussia (Siemens)



1851: First trans-sea cable between Dover and Calais



1858: Transatlantic line-based telegraphy between Europe and America



1866: Durable transatlantic cable

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