\
                  ------                    \
                / o   o \                   \
               | o o o o |                  \
               |o o o o o|                  \
               -----------                  \
                o o o o o                   \
                 o o o o                    \
                  o   o                     \
                                            \
--------------------------------------------\
         NC                NC
   BIAS   H.F.       EL,WHT   M

RX,JACKET RX  NC   TX  TX,JACKET
--------------------------------
   NC     NC  0V   NC     NC
    -12V    0V 0V   +12V
      -12V        +12V