1 Scope
2
References
3
Terms and definitions
4
Abbreviations
5
Performance-significant reference events
5.1 Recommendation Q.931 (Recommendation I.451)
5.2 Recommendation Q.921
5.3 X.25 layer 2 (LAPB)
5.4 Recommendation Q.764
5.5 Frame switching
5.6 Frame relaying
5.7 Recommendations Q.2931 and Q.2971
5.8 Recommendation Q.2762
5.9 B-ISDN ATM layer
5.10 Unrestricted digital bearer services
5.10.1 Performance-significant reference events
5.10.2 The relevant bit of user information