NOC                 _______PH1-6
-----------------> /_______PH7-12
|     T1       CO1---------PH13-19
|                  \-------PH19-24
|
|                   _______PH1-6
-----------------> /_______PH7-12
|     T1       CO2---------PH13-19
|                  \-------PH19-24
|
|                   _______PH1-6
-----------------> /_______PH7-12
|     T1       CO3---------PH13-19
|                  \-------PH19-24
|
|                   _______PH1-6
-----------------> /_______PH7-12
      T1       CO4---------PH13-19
                   \-------PH19-24