DIN EN 300659-2:2001-12
Действует
Access and terminals (AT) - Analogue access to the Public Switched Telephone Network (PSTN); Subscriber line protocol over the local loop for display (and related) services - Part 2: Off-hook data transmission (Endorsement of the English version EN 300659-2 V 1.3.1 (2001-01) as German Standard)
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