Hi,
The BCC is a field which is coded over 3 bits only. So the range of values is limited to 8.
The NCC is too defined over 3 bits. Therefore 8 values possible.
Each operator gets 1 or several NCC (within one country). Other operators from the same country gets different NCC’s.
The BSIC is the combination of NCC and BCC.
If one operator has NCC 1 and NCC 2, then it can use 16 BSIC:
10
11
12
13
14
15
16
17
20
21
22
23
24
25
26
27
zzzZ….zzzZZZ
I hope it helps,
Dr. Pixreinstein