Computer 1 DB25                       Computer 2  DB9
           ---------------                       ---------------

           13*       
                 *25 
             *       
                 *   
             *       
                 *   
             *       
                 *   
             *       
                 *   
             *       
                 *-DTR-------\
      GROUND *--------------- \  ------\
                 *             \        \
         DSR *----------------- \ --\    \                
                 *               \   \    \              
             *                    \   \    \--------* GROUND
                 *                 \   \                *9
             *                      \   \-----------* DTR
                 *                   \                  *
    RCV DATA *----------------------- \ ------------* TMT DATA
                 *                     \                *
    TMT DATA *------------------------- \ ----------* RCV DATA
                 *14                     \--------------* DSR
            1*                                     1*