3.2.4.2 Send Preamble

  • The initiator MUST send the Preamble Message as described in section 2.2.6.

  • In the case of Simplex mode, the initiator MUST send the Preamble End record as described in section 2.2.3.7.

  • In the case of Singleton Unsized, and Duplex modes, the initiator MUST perform the following additional steps:

    • If an upgrade is required, send the Upgrade Request Record as described in section 2.2.3.5.

    • If an upgrade is sent, read the Upgrade Response Record as described in section 3.1.4.8.

    • Send the Preamble End Record as described in section 2.2.3.7.

    • Read the Preamble Ack Record as described in section 3.1.4.10.

  • The initiator MUST set Send Allowed to TRUE.

  • If the mode is Duplex, the initiator MUST set Receive Allowed to TRUE.