Technologies de l'information — Télécommunications et échange d'information entre systèmes — Dispositif de secours à la jonction ETTD/ETCD réalisé à l'aide des circuits d'échange de la Recommandation UIT-T V.24

Specifies the procedures for back-up operation applicable to data transmission on a leased line when implemented through a single interface, controlling both the leased and the back-up facilities, using ITU-T Recommendation V.24 interchange circuits in conjunction with either the 25-pole connector (ISO 2110) or the 26-pole connector (ISO/IEC 11569). Cancels and replaces the first edition, which has been technically revised.