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Author's note Jan 16 1997

This paper is getting older and older, the basic interest is now on the Internet access rather than on Video-on-demand.

The technical details, however, should be still relevant.

Selected by PC Webopaedia


Kimmo K. Saarela
Tampere University of Technology
Telecommunication Laboratory
P.O. Box 553, 33101 Tampere, Finland


This paper gives a short introduction of Asymmetric Digital Subscriber Line (ADSL) transmission technology. ADSL is an interesting technology for the transport of VoD-services or other high bit-rate services over the ordinary phone-lines. ADSL uses a multi carrier modulation method called Discrete Multitone (DMT) which is also described in this paper.

A compressed Postscript version of this document is also available, check here.


It is not pkzip that makes life easy, but compress. Look for an archive called at the nearest ftp-site. In this archive you'll find both compress and tar, which are regularly used with real computers.

There is also one other tool, that helps, namely new winzip. Check for

The compress manual doesn't say it clear, but the decompression can be performed by using the flag -d. In this case:

compress -d

with the exception that PCs are unable to handle filename.first.second type of file names. This is left as an exercise.

If you have any questions or problems, despite of my trust in PC-machines, I'll try to help you if you still have some problems decompressing the file.

Kimmo K. Saarela
Last modified: Thu Jan 16 12:47:21 1997