a) Type II information (common):
- information transfer capability =speech or 3.1 kHz audio;
- information transfer mode = circuit;
- information transfer rate = 64kbit/s;
- user information layer 1 protocol =A/m-law.
b) Type III information for interworking with PSTN - Voice band data applications - Modem type conversion occurs - Figure I.11:
- user information layer 1 protocol =rate adaption + user rate + other attributes (if required).
Figure I.11/Q.931 – BC = 3.1 kHz audio – Voice band data –> PSTN