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X.75 is an International Telecommunication Union (ITU) (formerly CCITT) standard specifying the interface for interconnecting two
X.25 X.25 is an ITU-T standard protocol suite for Packet switched network, packet-switched data communication in wide area network, wide area networks (WAN). It was originally defined by the CCITT, International Telegraph and Telephone Consultative Co ...
networks.


Description

X.75 is almost identical to X.25. The significant difference is that while X.25 specifies the interface between a subscriber ( Data Terminal Equipment (DTE)) and the network ( Data Circuit-terminating Equipment (DCE)), X.75 specifies the interface between two networks (Signalling Terminal Equipment (STE)), and refers to these two STE as STE-X and STE-Y. This gives rise to some subtle differences in the protocol compared with X.25. For example, X.25 only allows network-generated reset and clearing causes to be passed from the network (DCE) to the subscriber (DTE), and not the other way around, since the subscriber is not a network. However, at the interconnection of two X.25 networks, either network might reset or clear an X.25 call, so X.75 allows network-generated reset and clearing causes to be passed in either direction. Although outside the scope of both X.25 and X.75, which define external interfaces to an X.25 network, X.75 can also be found as the protocol operating between switching nodes inside some X.25 networks.


See also

*
Internetworking Internetworking is the practice of interconnecting multiple computer networks. Typically, this enables any pair of hosts in the connected networks to exchange messages irrespective of their hardware-level networking technology. The resulting sys ...
*
Public data network A public data network (PDN) is a network established and operated by a telecommunications administration, or a recognized private operating agency, for the specific purpose of providing data transmission services for the public. The first public ...
* X.121


Further reading

* *{{cite book , last=Pooch , first=Udo W. , author2=William H. Greene , author3=Gary G. Moss , title=Telecommunications and Networking , publisher=Little, Brown and Company , location=Boston , year=1983 , isbn=0-316-71498-4


External links


ITU-T Recommendation X.75
History of computer networks Network layer protocols Wide area networks ITU-T recommendations ITU-T X Series Recommendations X.25