SELF_ID_EXTENDED_SHIFT
return (quadlet & SELF_ID_EXTENDED_MASK) >> SELF_ID_EXTENDED_SHIFT;
*quadlet |= (extended << SELF_ID_EXTENDED_SHIFT) & SELF_ID_EXTENDED_MASK;
*quadlet |= (sequence << SELF_ID_EXTENDED_SHIFT) & SELF_ID_EXTENDED_SEQUENCE_MASK;