This Recommendation defines the way of using ASN.1 as defined in ITU‑T Recs X.680, X.681, X.682 and X.683 with TTCN-3 (Testing and Test Control Notation 3) as defined in ITU‑T Rec. Z.140.

Content of this Recommendation has been moved into this separate Recommendation from ITU‑T Rec. Z.140 (04/2003). Since then, corrections and editorial changes have been made and included in this Recommendation.