Flow#1(cc)                     FSE                    Flow#2(cc)
----------                     ---                    ----------
#1 JOIN     ----register--> REGISTER

                            REGISTER    <--register-- JOIN #1

#2 CC_R(1)  ----UPDATE----> UPDATE (in)

#3 NEW RATE <---FSE_R(1)-- UPDATE (out) --FSE_R(2)-> #3 NEW RATE