Integrated Services Digital Network (ISDN); Telephony 7 kHz, videotelephony, audiographic conference and videoconference teleservices - Digital Subscriber Signalling System No. one (DSS1) protocol - Part 4: Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information for Testing (PIXIT) proforma specification for the user (Endorsement of the English version EN 300267-4 V 1.2.4 (2000-06) as German standard)
Edition 2001-02

Integrated Services Digital Network (ISDN); Telephony 7 kHz, videotelephony, audiographic conference and videoconference teleservices - Digital Subscriber Signalling System No. one (DSS1) protocol - Part 5: Test Suite Structure and Test Purposes (TSS&TP) specification for the network (Endorsement of the English version EN 300267-5 V 1.2.6 (1999-09) as German standard)
Edition 2001-02

Integrated Services Digital Network (ISDN); Telephony 7 kHz, videotelephony, audiographic conference and videotelephony teleservices - Digital Subscriber Signalling System No. one (DSS1) protocol - Part 6: Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information for Testing (PIXIT) proforma specification for the network (Endorsement of the English version EN 300267-6 V 1.2.6 (2000-06) as German standard)
Edition 2001-02

Integrated Services Digital Network (ISDN) - User-to-User Signalling (UUS) supplementary service; Digital Subscriber Signalling System No. one (DSS1) protocol - Part 1: Protocol specification (Endorsement of the English version EN 300286-1 V 1.2.4 (1998-06) as German Standard)
Edition 2000-05

Integrated Services Digital Network (ISDN) - User-to-User Signalling (UUS) supplementary service; Digital Subscriber Signalling System No. one (DSS1) protocol - Part 2: Protocol Implementation Conformance Statement (PICS) proforma specification (Endorsement of the English version EN 300286-2 V 1.2.4 (1998-06) as German Standard)
Edition 2000-05

Integrated Services Digital Network (ISDN) - User-to-User Signalling (UUS) supplementary service; Digital Subscriber Signalling System No. one (DSS1) protocol - Part 3: Test Suite Structure and Test Purposes (TSS&TP) specification for the user (Endorsement of the English version EN 300286-3 V 1.2.4 (1998-06) as German Standard)
Edition 2000-05

Integrated Services Digital Network (ISDN) - User-to-User Signalling (UUS) supplementary service; Digital Subscriber Signalling System No. one (DSS1) protocol - Part 4: Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information for Testing (PIXIT) proforma specification for the user (Endorsement of the English version EN 300286-4 V 1.3.3 (2000-05) as German Standard)
Edition 2000-10

Integrated Services Digital Network (ISDN); User-to-User Signalling (UUS) supplementary service - Digital Subscriber Signalling System No. one (DSS1) protocol - Part 5: Test Suite Structure and Test Purposes (TSS&TP) specification for the network (Endorsement of the English version EN 300286-5 V 1.4.1 (2003-01) as German standard)
Edition 2003-11

Integrated Services Digital Network (ISDN); User-to-User Signalling (UUS) supplementary service - Digital Subscriber Signalling System No. one (DSS1) protocol - Part 6: Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information for Testing (PIXIT) proforma specification for the network (Endorsement of the English version EN 300286-6 V 1.4.1 (2003-01) as German standard)
Edition 2003-11

Accesss and Terminals (AT) - 64 kbit/s digital unrestricted leased line with octet integrity (D64U) - Network interface presentation (Endorsement of the English version EN 300288 V 1.2.1 (2001-07) as German Standard)
Edition 2002-01