X.29

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X.29 is the ITU-T standard, approved by ISO, specifying procedures for the exchange of control information and user data between a Packet Assembler/Disassembler (PAD), and a remote packet-mode data terminal equipment (DTE) or another PAD. It defines the level 4 (or session layer in the OSI model) for X.25 communications, specifically call establishment and X.3 parameter negotiation.

Character-mode DTEs, which communicate with a PAD in a manner specified by the X.28 standard, are often referred to as X.29 terminals.

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