ETR 136 : 20001

Foreword
1 Scope
2 References
3 Symbols and abbreviations
4 Network reference configuration
5 Reference model
6 Functional requirements
  6.1 Structure of the ITU-T Recommendation V.110 frame
  6.2 Use of status bits (Sn and X)
  6.3 Use of E bits
  6.4 Frame alignment
  6.5 data bits mapping
  6.6 Adaptation of intermediate bit rate to 64 kbit/s
  6.7 Adaptation of 48 kbit/s and 56 kbit/s user bit rates
Annex A: Mapping of signals based on CCITT Recommendation X.50,
         division 2
      A.1 Frame structure
      A.2 Octet allocation
      A.3 Strategy for frame alignment
      A.4 Other framing aspects
Annex B: Mapping of signals based on CCITT Recommendation X.50,
         division 3
      B.1 Frame structure
      B.2 Octet allocation
      B.3 Strategy for frame alignment
Annex C: Mapping of signals based on CCITT Recommendation X.51
      C.1 Frame structures
      C.2 Channel allocation
      C.3 Strategy for frame alignment
      C.4 Other framing aspects
Annex D: Mapping of signals based on CCITT Recommendation X.58
      D.1 Frame structure
      D.2 Octet allocation
      D.3 Strategy for frame alignment
      D.4 Other framing aspects
      D.5 Maintenance channel
Annex E: CCITT Recommendation X.50, division 3/V.110 interworking
      E.1 Functional description and reference points
      E.2 Mapping of signals having bit rate not greater than
          19,2 kbit/s
      E.3 Mapping of signals having a 48 kbit/s bit rate
History

Specifies network reference configurations and functional requirements for the interconnection of digital leased line networks when sub-64 kbit/s leased line are considered.