Amendment 1 - Signalling Protocols and Switching (SPS) - V Interfaces at the Digital Local Exchange (LE) V5.2 Interface for the Support of Access Network (AN) - Part 1: V5.2 Interface Specification
Amendment 1 - Integrated Services Digital Network (ISDN); Attachment Requirements for Terminal Equipment to Connect to an ISDN Using ISDN Primary Rate Access
European Digital Cellular Telecommunications System (Phase 2) - Signalling Transport Mechanism Specification for the Base Station System - Mobile-Services Switching Centre (BSS - MSC) Interface
Public Switched Telephone Network (PSTN) - Protocol Over the Local Loop for Display and Related Services - Terminal Equipment Requirements - Part 1: Off-Line Data Transmission