a) Type II information (common):
- information transfer capability =unrestricted digital information;
- information transfer mode = packet;
- information transfer rate = -- -- --;
- user information layer 1 protocol =rate adaption + user rate (see Note 1);
- user information layer 2 protocol =LAPB (see Note 2);
- user information layer 3 protocol =X.25 [5] packet layer protocol (see Note 2).
NOTES
1. This parameter is included only when user packet information flow is rate adapted. Only those profiles conforming to Recommendation X.31 are allowed when only the above information is provided for layer 1 protocol.
2. Only those profiles conforming to Recommendation X.31 are used. See Figures I.8 to I.10.
b) Type III information for interworking with PSPDN, CSPDN, PSTN:
- no type III information is necessary.
Figure I.8/Q.931 – BC = ISDN Virtual Circuit (VC) –> PSPDN
Figure I.9/Q.931 – BC = ISDN Virtual Circuit (VC) –> CSPDN
Figure I.10/Q.931 – BC = ISDN Virtual Circuit (VC) –> PSTN
