The HP E7834A ATM Forum UNI 3.1 Core Signalling Conformance Test Suite for the User Side is designed to test the Signalling layer at the UNI 3.1 for ATM End Systems (User Side), such as ATM interface cards. It is based on the ATM Forum UNI Specification Version 3.1, derived from the ITU Recommendations Q.2931. Hewlett-Packard has developed the ATS, which is pending approval by the ATM Forum.