EN 301 141-1 : 2.1.1

Intellectual Property Rights
Foreword
Introduction
1 Scope
2 References
  2.1 Normative references
  2.2 Informative references
3 Definitions and abbreviations
  3.1 Definitions
  3.2 Abbreviations
4 General description
5 Layer 1 functions
  5.1 Powering Aspects
6 Layer 2 functions
  6.1 Overview
  6.2 PSTN-GW layer 2 state machine modifications
  6.3 PSTN layer 2 activation
7 Layer 3 functions and message definitions
  7.1 General
  7.2 Error handling
  7.3 Maintenance functions
8 B-channel selection procedure
  8.1 Introduction
  8.2 B-channel selection
Annex A (normative): B-channel selection
    A.1 General
    A.2 Outgoing calls (NTN to LE)
    A.3 Call clearing
    A.4 Incoming calls (LE to NTN)
    A.5 PSTN-GW parked state
    A.6 Clearing from parked state
    A.7 Outgoing calls (NTN to LE) with delayed B-channel
        selection
Annex B (informative): Background and motivation for NMDS
    B.1 Transparent supplementary service operation
    B.2 Operational benefits
Annex C (informative): The PSTN protocol adopted for the
        NMDS
    C.1 The V5 PSTN protocol
Annex D (informative): The relationship between a directly
        connected NMDS and one supported via an access
        network
    D.1 Introduction
Annex E (informative): The reasons for the new information
        element values chosen
    E.1 General
    E.2 Specific coding rules for information elements in the
        V5 specifications
    E.3 Specific codes used for the STATUS ENQUIRY information
        elements for NMDS
    E.4 Specific codes used for the STATUS information elements
        for NMDS
Annex F (informative): Permanent activation of basic access
        digital section
Annex G (informative): Remote equipment - functional requirements
Annex H (informative): Supplementary services useable at the
        NMDS
    H.1 Applicability of PSTN supplementary services
    H.2 Applicability of ISDN supplementary services
Bibliography
History

Describes requirements to support the Narrowband Multi-service Delivery System (NMDS) which provides interfaces connected via a Network Termination Node (NTN) to a Local Exchange (LE), in order to support existing PSTN and ISDN services.