Summary

As one type of hierarchical packet data networks to meet requirements of future packet-based networks, the public packet telecommunication data network (PTDN) should provide operation, administration, and maintenance (OAM) functions as specified in Recommendation ITU-T Y.2613. Recommendation ITU-T Y.2619 specifies maintenance entities (MTEs), OAM functions, and common OAM mechanisms in PTDN. Recommendation ITU-T Y.2619 also defines OAM mechanisms, functions, and encapsulation specific to connectionless mode and connection-oriented mode. Some examples of encapsulation for OAM messages in different planes are given in an annex.