Actualy i want to know :
1–>(at which voice data rate mobile (MS) transmitter transmit the voice in uplink in air ?)
2–>(what is the voice data rate when the signal is radiated by BTS in air in downlink )
3–>( & how it becomes 2.048 Mbps on E1-connection between BTS & BSC)
Finally–need to know that the mapping of voice data rate in air on E1(=2.048Mbps)