Q1 –> one timeslot on the air interface for GSM carries up to 22.8 kbps of ‘raw’ data in GSMK modulation (voice or GPRS), and up to 55kbps in 8PSK modulation (EDGE).
one user can get up to n timeslots when transferring data (GPRS / EDGE), depending on the class of the mobile. It is usually 4 timeslots… so the data rate can reach 220kbps in excellent condition. In urban environment, one user can usually expect 180kbps (outside busy hours).
the main prorool used in NGN are
1. The SIP or H323 protocolfor signaling between two Softswitch.
2. The MGCP or H248 to control MGW.
3.The Sigtran in order to carry the SS7 message over the IP network.