scope:

The purpose of this European Telecommunication Standard (ETS) is to specify retainablility parameters and measurement methods for Broadband Integrated Services Digital Network (B-ISDN) point to point Asynchronous Transfer Mode (ATM) switched connections. An International B-ISDN point to point ATM switched connection is partitioned into two National Portions (NPs), and an International Portion (IP). The IP is further partitioned into connection portions delimited by international measurement points (MPIs) as defined in ITU-T Recommendations I.353 [1] and I.356 [3]: International Transit Portions (ITPs) and International Inter-operator Portions (IIPs).