CONTENTS

 1     Introduction and scope
 2     Definitions
 3     Abbreviations
 4     References
 5     Conventions
 6     Overview
        6.1     Phase 1 – V.140 signature transmission and acquisition
        6.2     Phase 2 – Channel characterization
        6.3     Phase 3 – Capability exchange and mode selection
        6.4     Using V.140 to switch among multimedia operation modes
        6.5     Interoperability with terminals that do not support V.140
        6.6     Interworking with PSDSNs
 7     Network types
 8     Signals
        8.1     Data stream model
        8.2     Phase 1 – V.140 Signature Block and Compatible Protocol Field
                  8.2.1     Terminals attached to aligned channels
                  8.2.2     Terminals attached to non-aligned channels
                  8.2.3     Signature Pattern (SP) field
        8.3     Phase 2 – Alignment probing
                  8.3.1     Phase 2a – Initial values
                  8.3.2     Phase 2b – After SP acquisition
                  8.3.3     Phase 2c – After RSP acquisition
        8.4     Phase 3 signals
                  8.4.1     roleAndCapability PDU
                  8.4.2     modeSelect PDU
                  8.4.3     youChoose PDU
                  8.4.4     modeSelectAcknowledge PDU
                  8.4.5     terminate PDU
        8.5     Phase 3 HDLC framing
                  8.5.1     Format convention
                  8.5.2     Flag sequence
                  8.5.3     Distinguishing sequence
                  8.5.4     Information field
                  8.5.5     Frame check sequence field
                  8.5.6     Transparency
 9     Procedures
        9.1     Channel establishment
                  9.1.1     Interactions with ISDN D-channel signalling
        9.2     Phase 1 – Signature transmission and acquisition
                  9.2.1     Transmitter procedure
                  9.2.2     Receiver procedure
        9.3     Phase 2 – Determination of network characteristics and bit alignment
                  9.3.1     Phase 2a – Transmitting and acquiring SP in each subchannel
                  9.3.2     Phase 2b – Reflected SP and alignment recovery
                  9.3.3     Determination of network characteristics and bit-alignment from received SP/RSP
                  9.3.4     Phase 2c – Concluding Phase 2 and proceeding to Phase 3
        9.4     Phase 3 – Role arbitration, capability exchange, and mode selection
                  9.4.1     roleAndCapability transmission
                  9.4.2     Initiator procedure
                  9.4.3     Responder procedure
                  9.4.4     General Phase 3 procedures
        9.5     Entering selected mode
10     Resuming V.140 from a selected mode
Annex A – ASN.1 definition of Phase 3 PDU values