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Connection-Oriented Network Service (CONS) is one of the twoOpen Systems Interconnection (OSI)network-layer protocols, the other beingConnectionless-mode Network Service (CLNS). It is basicallyX.25, with a few^[which?] adjustments.

Some protocols that provide the CONS service:

• X.25, as specified inITU-T Recommendation X.223 is aPublic Data Network protocol that provides the Connection Oriented Network Service as described inITU-T Recommendation X.213.
• Signalling Connection Control Part (SCCP), as specified inITU-T Recommendation Q.711 is aSignaling System 7 protocol that provides the Connection Oriented Network Service as described inITU-T Recommendation X.213.
• Service Specific Connection Oriented Protocol (SSCOP), as specified inITU-T Recommendation Q.2110 is anAsynchronous Transfer Mode protocol that provides the Connection Oriented Network Service as described inITU-T Recommendation X.213.

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