A----+------0
     |
     |
     |
     |           +--------------- ASCOM paging system
     |          /
     |         /
     |        / ^
B----|--+---0   :
     |  |       :
     |  |       :
     |  |  +----+----+
     |  |  |         |
     |  +--+         |
     |     |   micro |
     +-----+         |
           |         |
           +---------+