DIN ETS 300403-4 : 1997 Title: Integrated Services Digital Network (ISDN) - Digital Subscriber Signalling System No. one (DSS1) protocol - Signalling network layer for circuit-mode basic call control - Part 4: Test Suite Structure and Test Purposes (TSS&TP) specification for the user; English version ETS 300403-4:1997 Year: 1997 Publisher: DIN Media GmbH Availability: Within 1-2 working days