0                                       1
  0   1   2   3   4   5   6   7   8   9   0   1   2   3   4   5
+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+
| 0 | 0 | 1 | 1 |FBI|CON|KLO|            RSV            |CID|EXT|
+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+