Directional coupler ' problem

Hi! I have a Directional coupler with four CPL ports,I dont know what is difference between the four CPL ports,?From the "performance data" I see the coupling is 30dB,So If I connect four CPL ports can reach 120dB? or still 30dB?and I dont know what the "isolation cpl-cpl"means in the performance.
THS!


CQCQ

I guess the four coupled ports are the same: each of them has a coupling of 30 dB, relative the input port. Then there is an internal isolation between each of the coupled ports, having the value in the column "Isolation (dB) Cpl-Cpl". You cannot get 120 dB with this device.

What are the total number of rf connectors on this coupler?

one INPUT,one OUTPUT. THS!

According to the diagram above there are six connectors...