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ČSN is a protected designation of Czech national technical standards.
Attachments to Public Switched Telephone Network (PSTN) - General technical requirements for equipment connected to an analogue subscriber interface in the PSTN - Chapter 1 to 10
Standard published on 1.11.1999
Selected format:Public Switched Telephone Network (PSTN). Category II specification 9 600 or 4 800 bits per second duplex modems standardized for use on the PSTN
Standard published on 1.2.1997
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WITHDRAWN published on 1.6.1995
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WITHDRAWN published on 1.11.1994
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WITHDRAWN published on 1.11.1994
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WITHDRAWN published on 1.11.1994
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WITHDRAWN published on 1.11.1994
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WITHDRAWN published on 1.11.1994
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WITHDRAWN published on 1.11.1994
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WITHDRAWN published on 1.11.1994
Selected format:Latest update: 2025-08-22 (Number of items: 2 213 186)
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