DS DS/EN 60870-6-2
DS DSEN 60870-6-2 1996-MAR-28 Telecontrol equpment and systems - Part 6 Telecontrol protocols compatble wth SO standards and TU-T recommendatons - Secton 2 Use of basc standards OS layers 1-4
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Considers the standards related to layers 1-4 of the OSI reference model and describes the role and the functions carried out by each layer.