Summary

Public packet telecommunication data network (PTDN) is one of the hierarchical data networks needed to meet the requirements of future packet-based networks whose reference interfaces are defined in ITU-T Y.2613.

Recommendation ITU-T Y.2620 identifies the T interface and its functions between PTDN edge devices and address translators (ADT). The functions, procedures for the two interface types, i.e., T1 interface and T2 interface, are described. Appendix I gives an example of encapsulation for T interface messages, and Appendix II gives a candidate message format for address resolution in the T1 interface.