BUSINESS TELECOMMUNICATIONS (BTC). ORDINARY AND SPECIAL QUALITY VOICE bandwidth 4-wire analogue leased lines (A4O and A4S). Attachment requirements for terminal equipment interface.
Edition 1997-07-15

Access and Terminals (AT) - Multiple 64 kbit/s digital unrestricted leased lines with octet integrity presented at a structured 2 048 kbit/s interface at either or both ends (D64M) - Connection characteristics and network interface presentation
Edition 2001-11-01

Business telecommunications (BT); Open Network Provision (ONP) technical requirements; 2048 kbit/s digital unstructured leased line (D2048U); network interface presentation; English version ETS 300246:1993
Edition 1994-04

CUSTOMER PREMISES CABLING FOR INFORMATION TECHNOLOGY. PART 2:2048 KBIT/S ISDN PRIMARY ACCESS AND LEASED LINE NETWORK INTERFACE.
Edition 1997-10-30

BUSINESS TELECOMMUNICATIONS (BTC). 64 KBIT/S DIGITAL UNRESTRICTED LEASED LINE WITH OCTET INTEGRITY (D64U). ATTACHMENT REQUIREMENTS FOR TERMInal equipment interface.
Edition 1998-06-30

BUSINESS TELECOMMUNICATIONS (BTC). OPEN NETWORK PROVISION (ONP) TECHNICAL REQUIREMENTS. 2048 KBIT/S DIGITAL UNSTRUCTURED LEASED LINE (D2048U). ATTACHMENT REQUIREMENTS FOR TERMINAL EQUIPMENT INTERFACE.
Edition 1998-06-30

Customer premises cabling for information technology - Part 2: 2048 kbit/s ISDN primary access and leased line network interface; German version EN 50098-2:1996
Edition 1996-06

BUSINESS TELECOMMUNICATIONS (BTC). 2048 KBIT/S DIGITAL STRUCTURED LEASED LINE (D2048S). TERMINAL EQUIPMENT INTERFACE.
Edition 1999-01-11

BUSINESS TELECOMMUNICATIONS (BTC). OPEN NETWORK PRIVISION (ONP) TECHNICAL REQUIREMENTS. 2048 KBIT/S DIGITAL UNSTRUCTURED LEASED LINE (D2048U). NETWORK INTERFACE PRESENTATION.
Edition 1999-01-11

BUSINESS TELECOMMUNICATIONS (BTC). OPEN NETWORK PROVISION (ONP) TECHNICAL REQUIREMENTS. 2048 KBIT/S DIGITAL UNSTRUCTURED LEASED LINE (D2048U). CONNECTION CHARACTERISTICS.
Edition 1999-01-11