1.

SIS II shall be composed of: a central system (‘Central SIS II’) composed of: a technical support function (‘CS-SIS’) containing a database, the ‘SIS II database’; a uniform national interface (‘NI-SIS’); a national system (the ‘N.SIS II’) in each of the Member States, consisting of the national data systems which communicate with Central SIS II. An N.SIS II may contain a data file (a ‘national copy’), containing a complete or partial copy of the SIS II database; a communication infrastructure between CS-SIS and NI-SIS (the ‘Communication Infrastructure’) that provides an encrypted virtual network dedicated to SIS II data and the exchange of data between SIRENE Bureaux as referred to in Article 7(2).

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Source: EUR-Lex (Cellar) · retrieved 2026-11-14 · Text as adopted (Official Journal); later amendments are not incorporated in this text.