ITU-T Q.112-1989 Signal Levels and Signal Receiver Sensitivity - General Recommendations on Telephone Switching and Signalling - Functions and Information Flows for Services in the ISDN - Supplements (Study Group XI) 2 pp
CCI?T Recommendation characteristics of primary PCM multiplex equipment operating at 2048 kbit/s, Vol. III, Fascicle 111.3, Rec. (3.732. CCITT Recommendation Characteristics of primary PCM multiplex equipment operating ut 1544 kbit/s, Vol. III, Fascicle I
ITU-T Q.112-1989 history
1989ITU-T Q.112-1989 Signal Levels and Signal Receiver Sensitivity - General Recommendations on Telephone Switching and Signalling - Functions and Information Flows for Services in the ISDN - Supplements (Study Group XI) 2 pp