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Cisco XOT
Cisco XOT (X.25 over TCP) facilitates the encapsulation of legacy X.25 traffic within TCP/IP networks, enabling organizations to transition smoothly from traditional X.25 infrastructure to modern IP-based networking without replacing existing applications. It supports both TCP and UDP for flexible transport options..
Overview:
Cisco X.25 over TCP (XOT) is a protocol developed to encapsulate X.25 packets within TCP connections. This allows organizations to maintain their legacy X.25 applications and devices over contemporary IP network infrastructures. Since X.25 was widely used for WAN connectivity due to its reliable packet-switching capabilities, XOT provides a critical bridge for modernization.
Functionality:
In operation, XOT encapsulates LAPB frames (X.25 layer 2) into TCP segments, transmitting over standard IP networks. This substitute for physical X.25 links reduces the reliance on expensive leased lines or dedicated X.25 networks. It can operate over both TCP and UDP, although TCP is more commonly used due to its connection-oriented nature complementing X.25's requirements.
Deployment:
XOT is primarily found on Cisco networking equipment and is a key part of migration strategies where legacy financial, industrial, or telemetry systems still rely on X.25 protocols. It is supported on Cisco IOS platforms and can interoperate with X.25 DTE and DCE devices deployed in banks, ATMs, payment terminals, and traditional telemetry systems.