The work on FMBS has progressed in 1988-1992 to provide a number of Recommendations which supersede the information formerly included in the Blue Book version of Recommendation 1.122.
ITU-T I.122 FRENCH-1993 history
1993ITU-T I.122 FRENCH-1993 Framework for Frame Mode Bearer Services - Integrated Services Digital Network (ISDN); General Structure (Study Group XVIII) 4 pp