Foreword
1 Scope
2 Normative references
3 Definitions
4 Symbols and abbreviations
5 Basic principles and rules
  5.1 Capabilities
  5.2 Commands
  5.3 Sequencing of BAS codes
  5.4 Values of unoccupied bits
6 Basic sequences
  6.1 Capability exchange (sequence A)
  6.2 Mode switching (sequence B)
  6.3 Frame reinstatement (sequence C)
7 Procedures
  7.1 Mode initialisation procedure (inband)
  7.2 Mode switching
  7.3 Mode forcing procedures
  7.4 Procedure for use of Encryption Control Signal
      (ECS) channel
  7.5 Procedure for activation and de-activation of
      data channels
  7.6 Procedure for use of BAS-extension codes
8 Fault recovery
  8.1 General recovery procedures
  8.2 Incoming A=1
  8.3 Mode mismatch
  8.4 Loss of alignment
  8.5 Loss of connection or channel
  8.6 Terminal Equipment Alarm (TEA) (optional)
Annex A (informative): Bibliography
History