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Migrating X.25 over PSI to X.25 over TCP/IP (XOT)

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6 Relationship between X.25 and TCP/IP
X.25 requires that the layer below it provides message semantics, in particular in the boundary
between packets. To provide this, a small (4-byte) XOT header is added between TCP and X.25.
XOT is intended to be insensitive to the DTE/DCE role of the local interfaces at either end of an
XOT TCP connection. A separate TCP connection MUST be used for each X.25 virtual circuit. All
connections MUST be made to TCP port number 1998. This port number is an IANA Registered
Port Number registered by Cisco Systems; Cisco has designated it for use by XOT.
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