CONTENTS

 1     Introduction
 2     Scope
 3     References
 4     Terms and definitions
 5     Abbreviations
 6     Access Network
 7     Scenarios
        7.1     Scenario 1 – A few single terminals connected to a National network via a VSAT network
        7.2     Scenario 2 – Several end users attached to the Remote Interface Unit
        7.3     Scenario 3 – Geographically distributed multiple user outstations
        7.4     Scenario 4 – Extension of previous scenarios to include accesses to multiple main networks
        7.5     Scenario 5 – Connection via a Remote PBX
        7.6     Scenario 6 – Inclusion of a Local PBX
                  7.6.1     Considerations relating to isolated digital transmission components
        7.7     Scenario 7 – PBXs at both ends
 8     General issues
        8.1     Transmission planning
        8.2     Echoes
        8.3     Digital encoding of voiceband signals
        8.4     Remote station technology
        8.5     Multiple public networks
 9     Interconnection policy
10     Interconnection to National Telephone networks at the lowest level of the national transit network, the Local exchange
11     Local Exchange analogue ports
       11.1     Local Exchange basic parameters
       11.2     Digital ports
12     Transmission planning
       12.1     Introduction of VSATs into the Access network
       12.2     Transmission impairments
                 12.2.1     General noise and interference
                 12.2.2     Quantizing noise
       12.3    Transmission levels
                 12.3.1     The National Transmission Plan
                 12.3.2     Selection of Loss in a VSAT system
                 12.3.3     Signal-to-Quantization Distortion ratio
       12.4     Attenuation frequency distortion
       12.5     Group delay frequency distortion
       12.6     Crosstalk
                 12.6.1     Crosstalk parameters
       12.7     Stability
       12.8     Echo considerations
       12.9     Clipping
                 12.9.1     Front-end clipping
                 12.9.2     Temporal clipping
                 12.9.3     Power level clipping
13     "Permission to Connect" requirements for private networks
14     Remote terminal penetration enhancement techniques
15     Management
       15.1     Operations and maintenance
16     Availability
17     Commissioning
18     Numbering issues
19     The Network Operator's perspective
       19.1     Billing
       19.2     Routine testing
       19.3     Payphone support
       19.4     Call set-up times
       19.5     Special services support
Annex A – Organization of annexes
Annex B – The analogue 2-wire port facing the exchange within Europe
        B.1     Introduction and methodology
        B.2     Identification of the states of the Terminal Equipment (TE)
                  B.2.1     TE allowed basic states
        B.3     d.c. characteristics
                  B.3.1     Contents
                  B.3.2     Central Battery Exchange Systems
                  B.3.3     Insulation resistance
                  B.3.4     d.c. conditions in the loop state
                  B.3.5     Overload susceptibility
        B.4     Voiceband signal transmission characteristics
                  B.4.1     Input impedance of the TE
                  B.4.2     Multi-parameter Balance requirements
                  B.4.3     Voiceband signal/frequency characteristics of the TE
                  B.4.4     Maximum signal levels at the TE
                  B.4.5     Noise
                  B.4.6     Immunity to out-of-band signalling
                  B.4.7     National limits on the level of signals sent to line
        B.5     The calling function
                  B.5.1     Detection of the dialling reception state of the exchange
                  B.5.2     Dialling with MFPB (DTMF)
                  B.5.3     Automatic calling precautions
        B.6     The answering function
                  B.6.1     Ringing detectors
                  B.6.2     Automatic answering function
                  B.6.3     Loss of signal
                  B.6.4     Automatic terminals with network-tone detectors
                  B.6.5     Power failure
        B.7     Connection methods
        B.8     Frequencies for customer's meter operation
Annex C – European network tones
        C.1     Dial tones
        C.2     Ringing tones
        C.3     Busy tones
        C.4     Congestion tones
        C.5     Special information tones
        C.6     Call in progress tone
        C.7     Tones for other purposes
Annex D
        D.1     Analogue 4-wire interfaces to a public network
Annex E – Remote user network interface
        E.1     Scope
        E.2     References
        E.3     Abbreviations
        E.4     Introduction
        E.5     Requirements
                  E.5.1     Line characteristics
                  E.5.2     d.c. characteristics requirements in the quiescent state
                  E.5.3     Requirements in the Loop state
                  E.5.4     Requirements in the ringing state
        E.6     Transmission characteristics
        E.7     Metering
                  E.7.1     Frequency
                  E.7.2     Level
        E.8     Payphone option
Annex F – Telephone network interfacing in the United States of America
        F.1     Introduction
        F.2     References
        F.3     Abbreviations
        F.4     d.c. conditions
                  F.4.1     Battery supply
                  F.4.2     Battery connections at a 4-wire interface
        F.5     Interface states
                  F.5.1     Idle state
                  F.5.2     Service Request state
                  F.5.3     Addressing state
                  F.5.4     Call Processing state
                  F.5.5     Ringing and Alerting state
                  F.5.6     Communication state