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This International Standard defines the means by which a data communication system operating according to the basic mode control procedures defined in ISO/R 1745 can interchange information messages in a fast conversational manner and where the operator plays a significant role in the operation of the terminal.

This International Standard extends Phase 3 (information transfer) as defined in ISO/R 1745, to allow two stations connected by a data link to reverse their master/slave status, thereby reversing the direction of the information transfer, without leaving Phase3.

During one conversation process considered here, only two stations are involved a t one time. Conversation with any other station requires termination of the existing data link and establishment of another data link.

This procedure applies to the following system configurations : point-to-point, centralized mu1tipoint.