Technologies de l'information — Télécommunications et échange d'information entre systèmes — Procédures de commande de liaison de données de haut niveau — Description des procédures de liaison de données ETTD compatibles X.25 LAPB

Cancels and replaces the first edition (1986). Defines an application of certain HDLC standards. Also defines the structure, elements and procedures for the operation of a DTE using the X.25 LAPB protocol. The procedures are applicable to data interchange between a DTE and a DCE, or between two DTEs. The procedures are defined for use on duplex links, using synchronous transmission or start/stop transmission.