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83:"ETSI ES 203 021-1 V2.1.1 (2005-08) : ETSI Standard Access and Terminals (AT); Harmonized basic attachment requirements for Terminals for connection to analogue interfaces of the Telephone Networks; Update of the technical contents of TBR 021, EN 301 437, TBR 015, TBR 017; Part 1: General aspects"
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