ETSI EN 302 091-4 Broadband Integrated Services Digital Network (B-ISDN) and Broadband Private Integrated Services Network (B-PISN); Digital Subscriber Signalling System No. two (DSS2) and Broadband Inter-Exchange Signalling (B-QSIG) and Signalling System No.7 (SS7); Prenegotiation; Part 4: Abstract Test Suite (ATS)

standard by European Telecommunications Standards Institute, 09/01/2000