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
  5.3 Line signals
  5.4 Line signalling rates
  5.5 Encoding and decoding of data
  5.6 Threshold of the received line signal detector
  5.7 Channel allocation
  5.8 Hand-shaking sequences
  5.9 Transmission of start-stop characters
  5.10 Scrambler and de-scrambler
  5.11 Test loop 2
Annex A (normative): Testing methods
  A.1 General testing conditions
  A.2 Test for subclause 5.3.1 (Carrier frequencies)
  A.3 Test for subclause 5.3.2 (Guard tone)
  A.4 Test for subclause 5.4 (Line signalling rates)
  A.5 Test for subclause 5.5 (Encoding and decoding of
      data)
  A.6 Test for subclause 5.6 (Threshold of received
      line signal detector)
  A.7 Test for subclause 5.7 (Channel allocation)
  A.8 Test for subclause 5.8 (Hand-shaking sequences)
  A.9 Test for subclause 5.10 (Scrambler and
      de-scrambler)
  A.10 Test for subclause 3.11 (Test loop 2)
Annex B (informative): Derivation of timings
Annex C (informative): Example proforma for the
                       declaration of modes of
                       operation/use
Annex D (informative): Bibliography
History

Abstract

Specifies the technical characteristics to be met by modem seeking Category II approval for duplex operation over the PSTN at 2400 bits per second. Specifies four 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 300 117 : FEB 96