Hi, RK.
We don’t use Siemens hardware, but I was interested in Flex CU.
This is what I understood:
FCU – 2 carrier units fitted in one module size. This means:
CC link multiplexing – you should check the compatible versions of the core modules;
overheating – check the fan version ( Tomar is right – you need V6 to be sure ).
The FCU can be activated in two modes:
coverage – the two CUs are processing the same data, but they are connected to two different antenna systems ( Tx diversity – some extra dB );
capacity – two different CUs ( even on different cells ).
So my opinion is that this is a way to double the capacity without
ext. racks.
All racks produced last two-three years are second version.
Please correct me if something wrong.
BR
TNS