How many TRX we can use on one E1 in Nokia?
It is 12.
But it is not the E1 who restricted this number to go further,rather it is their cabinet capacity.
In nokia ultrasite BTS they have the provision only for 12 TRX per cabinet.
If you want to go further you have to use another cabinet. And that is nothing but a separate BTS.
However the only BTS site in the world with the capacity 36+36+36 is of Nokia and is at Macca in UAE.
Here 9 is the maximum limit for chaining cabinets in Nokia.