oh, ok, THE full configuration. Well, I’ve no idea about THE full configuration of your BSC, because the full configuration of a Huawei, Ericsson, Alcatel, Nokia, Motorola, ZTE BSC’s are all different.
As said earlier, it depends on how many TRX will be connected to the BSC.
sorry, i can’t help you on this one. it is dependent on Siemens specs, but if you can tell me how many TRX are connected to your BSC in full config, i can give you a rough idea of how many E1 you’ll need.