An ITU standard for connecting X.25 networks.
The ITU-T Recommendation for the interconnection of X.25 packet-switched networks. Through an X.75 gateway that serves as a network-to-network interface, issues of packet size are resolved. The X.75 gateway examines packets for errors, and either segments the payloads of large packets into multiple smaller packets or combines the payloads of multiple smaller packets into larger ones. The gateway then encapsulates each with the necessary control data in the form of a header and trailer, modifies the addressing scheme as required, and presents each to the target network.