ETS 300 117 : 20002

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

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.