ITS NOT WIERD…..OK!!!!
For your kind information if u r running a site with 4-4-4 conf & u are not using any hopping then you need 12 carriers to run the site.
Else if u r using hopping then u will require only 3 carriers (per sector) for BCCH & the rest of the carriers can be made to run on hopping using the whole MA list with proper MAIO & HSN planning.
Now i think that this might hav made u clear….
I think that u r getting confused with TRX & carriers.