header_type ptp_t {
    fields {
        transportSpecific : 4;
        messageType       : 4;
        reserved          : 4;
        versionPTP        : 4;
        messageLength     : 16;
        domainNumber      : 8;
        reserved2         : 8;
        flags             : 16;
        correction        : 64;
        reserved3         : 32;
        sourcePortIdentity: 80;
        sequenceId        : 16;
        PTPcontrol        : 8;
        logMessagePeriod  : 8;
        originTimestamp   : 80;
    }
}
