Cisco X.25 (XOT) based on TCP protocol is a protocol for implementing X.25 transmission on IP Internet. The X.25 data cladding typically uses LAPB, and requires a reliable link layer below itself. XOT provides a method of sending an X.25 packet on IP Internet, that is, the X.25 data wrap layer is encapsulated in the TCP packet.
TCP has a reliable byte stream. The following layers, especially the boundaries between the data package are required in X.25, including information semantics. In order to achieve this goal, the XOT protocol header between TCP and X.25 is required (approximately 4 bytes). The XOT protocol header includes a long field to separate the X.25 packets in the TCP stream.
Standard X.25 protocol packet format and status conversion rules are usually applied to X.25 layers in XOT. It should be noted that exceptions should be considered.
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