ITU-T X.371 PDF

This Recommendation specifies general arrangements for interworking between the Internet and Public Data Networks (PDNs) among which PSPDN and FRPDN are considered. Three possible cases are defined:

− the case where the IP-TE connected to the PDN accesses the Internet via the PDN (access case);

− the case where two Internet subnetworks are concatenated via the PDN (Concatenation case 1);

− the case where two PDNs are concatenated via the Internet (Concatenation case 2).

The following arrangements are specified in this Recommendation:

1) reference configuration;

2) interface characteristics for UNI and NNI;

3) addressing mechanism;

4) functionality of the Access Unit (AU), InterWorking Function (IWF) and the Adapter.