Table of Contents

Foreword
1 Scope
2 Normative references
3 Definitions and abbreviations
  3.1 Definitions
  3.2 Abbreviations
4 General requirements
  4.1 References to other ETSs
  4.2 Information to be provided by the applicant
5 Functional requirements specific to Category II
  modems
  5.1 General requirements
  5.2 Modes of operation/use
  5.3 Line signals
  5.4 Line signalling rates
  5.5 Encoding of data
  5.6 Scrambler and descrambler
  5.7 Channel allocation
  5.8 Hand-shaking sequences
  5.9 Transmission of start-stop characters
  5.10 Threshold of received line signal detector
  5.11 Test loop 2
  5.12 Receiver performance
Annex A (normative): Testing methods
A.1 General testing conditions
A.2 Test for subclause 5.3.1 (Transmitted carrier
    frequency)
A.3 Test for subclause 5.3.2 (Receiver carrier
    tolerance)
A.4 Test for subclause 5.4 (Line signalling rates)
A.5 Test for subclause 5.5 (Encoding of data)
A.6 Test for subclause 5.6 (scrambler and descrambler)
A.7 Test for subclause 5.7 (Channel allocation)
A.8 Test for subclause 5.8 (Hand-shaking sequences)
A.9 Test for subclause 5.9 (Transmission of start-stop
    characters)
A.10 Tests for subclause 5.11 (Test loop 2)
Annex B (informative): Example proforma for the
                       declaration of modes of
                       operation/use
Annex C (informative): Formal description of the
                       start-up sequence
Annex D (informative): Bibliography
History

Abstract

Specifies the technical characteristics to be met by modems seeking Category II approval for duplex operation over the PSTN at 9600 or 4800 bits per second. Specifies six modes of operation, each with five modes of use.

General Product Information

Published
Document Type	Standard
Status	Current
Publisher	European Telecommunications Standards Institute
Pages
ISBN
Committee	TE 5
Supersedes	PRETS 300 002 : FEB 96