Packet Layer Protocol Packet Layer Protocol or PLP Network Layer protocol for the X.25 protocol suite . PLP manages the packet exchanges between DTE devices across VCs . PLP also can be used on ISDN using Link Access Procedures, D channel .modes of PLP: call setup , data transfer , idle, call clearing, and restarting . Call setup mode is used to create VCs between DTE devices. A PLP uses the 14-digit X.121 addressing scheme to set up the virtual call. Data transfer modedata between DTE devices across a virtual call. At this level PLP handles segmentation and reassembly , bit padding , error control and flow control . Idle mode is used when a virtual call is established but there is no data transfer happening. Call clearing mode is used to end sessions between DTE devices and to terminate VCs. Restarting modelocally connected DCE device. General Format Identifier : Identifies packet parameters, what type of windowing is being used, and whether delivery confirmation is needed. Logical Channel Identifier : Identifies the virtual call across the local DTE/DCE interface . Packet Type Identifier : Identifies the PLP packet type. User Data —Contains encapsulated upper-layer information when there is user data present, otherwise additional fields containing control information are added.
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