Facility indicator


           8  7  6  5  4  3  2  1
        1  H  G  F  E  D  C  B  A

H G F E D C B A
0 0 0 0 0 0 0 0 - spare
0 0 0 0 0 0 0 1 - spare
0 0 0 0 0 0 1 0 - user-to-user service
0 0 0 0 0 0 1 1 - spare
to
1 1 1 1 1 1 1 1 - spare