ABSTRACT: This document provides the view of Telcordia on generic requirements for Integrated Services Digital Network (ISDN) Packet Handler functions to support X.25 user testing capabilities. These capabilities are intended for use by ISDN customers and network maintenance personnel. The requirements present two approaches that allow subscribers to establish test calls and receive looped back layer 3 packets.

These tests allow the subscriber to verify that layers 1, 2, and 3 are operating correctly. Such testing can also be used by network personnel to verify that a new customer has connectivity through the packet network. The document also provides generic requirements for an independent echo station.