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 received line signal detection
  5.7 Channel allocation
  5.8 Hand-shaking sequences
  5.9 Transmission of start-stop characters
  5.10 Scrambler and descrambler
  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 (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 detection)
  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
      descrambler)
  A.10 Test for subclause 5.11 (test loop 2)
Annex B (normative): 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 modems seeking Category II approval for duplex operation over the PSTN at 1200 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 300 116 : FEB 96