Definition: Main telephone line

Category: Information society

A main telephone line is a telephone line connecting the subscriber’s terminal to the Public Switched Telephone Network (PSTN). 

ISDN (Integrated Services Digital Network) lines are counted as main telephone lines. http://ec.europa.eu/eurostat/ramon/coded_files/KS-NP-06-009-EN.pdf
Source:
Eurostat, "Telecommunications in Europe", Statistics in Focus, Industry, Trade and Services, 9/2006, Luxembourg, 2006
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