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Theory and Information on Telecommunication

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Electronics Infoline Web

Communication Techniques

Communication Techniques

http://www.cs.ucl.ac.uk/staff/S.Bhatti/D51-notes/node10.html

Some small phone FAQ

Some small phone FAQ

http://margo.student.utwente.nl/el/phone/faq4phon.zip

DTMF frequently asked questions

DTMF frequently asked questions

http://margo.student.utwente.nl/el/phone/dtmf.zip

Info about phone cards

Info about phone cards

http://margo.student.utwente.nl/el/phone/phn_card.zip