Date of Last Update : 16 May 1995 List of ITU-T R-Series Recommendations in force ** - Series R * Telegraph distortion R.2 (1988) [Blue Book Fasc. VII.1] [Publ.: Apr.90] Element error rate R.4 (1988) [Blue Book Fasc. VII.1] [Publ.: Apr.90] Methods for the separate measurements of the degrees of various types of telegraph distortion R.5 (1993) [Rev.1] [1 pp.] [Publ.: Jul.94] Observation conditions recommended for routine distortion measurements on international telegraph circuits R.9 (1993) [Rev.1] [2 pp.] [Publ.: Jun.94] How the laws governing distribution of distortion should be arrived at R.11 (1993) [Rev.1] [2 pp.] [Publ.: Sep.94] calculation of the degree of distortion of a telegraph circuit in terms of the degrees of distortion of the component links * Voice-frequency telegraphy R.20 (1988) [Blue Book Fasc. VII.1] [Publ.: Apr.90] Telegraph modem for subscriber lines R.30 (1988) [Blue Book Fasc. VII.1] [Publ.: Apr.90] Transmission characteristic for international VFT links R.31 (1988) [Blue Book Fasc. VII.1] [Publ.: Apr.90] Standardization of AMVFT systems for a modulation rate of 50 bauds R.35 (1988) [Blue Book Fasc. VII.1] [Publ.: Apr.90] Standardization of FMVFT systems for a modulation rate of 50 bauds R.35 bis (1988) [Blue Book Fasc. VII.1] [Publ.: Apr.90] 50-baud wideband VFT systems R.36 (1988) [Blue Book Fasc. VII.1] [Publ.: Apr.90] Coexistence of 50-baud/120-Hz channels, 100-baud/240-Hz channels, 200-baud/360-Hz or 480-Hz channels on the same voice-frequency telegraph system R.37 (1988) [Blue Book Fasc. VII.1] [Publ.: Apr.90] Standardization of FMVFT systems for a modulation rate of 100 bauds R.38 A (1988) [Blue Book Fasc. VII.1] [Publ.: Apr.90] Standardization of FMVFT system for a modulation rate of 200 bauds with channels spaced at 480 Hz R.38 B (1988) [Blue Book Fasc. VII.1] [Publ.: Apr.90] Standardization of FMVFT systems for a modulation rate of 200 bauds with channels spaced at 360 Hz usable on long intercontinental bearer circuits generally used with a 3-kHz spacing R.39 (1988) [Blue Book Fasc. VII.1] [Publ.: Apr.90] Voice-frequency telegraphy on radio circuits * Special cases of alternating current telegraphy R.40 (1988) [Blue Book Fasc. VII.1] [Publ.: Apr.90] Coexistence in the same cable of telephony and super-telephone telegraphy R.43 (1988) [Blue Book Fasc. VII.1] [Publ.: Apr.90] Simultaneous communication by telephone and telegraph on a telephone-type circuit R.44 (1988) [Blue Book Fasc. VII.1] [Publ.: Apr.90] 6-unit synchronous time-division 2-3-channel multiplex telegraph system for use over FMVFT channels spaced at 120 Hz for connection to standardized teleprinter networks R.49 (1988) [Blue Book Fasc. VII.1] [Publ.: Apr.90] Interband telegraphy over open-wire 3-channel carrier systems * Transmission quality R.50 (1988) [Blue Book Fasc. VII.1] [Publ.: Apr.90] Tolerable limits for the degree of isochronous distortion of code-independent 50-baud telegraph circuits R.51 (1988) [Blue Book Fasc. VII.1] [Publ.: Apr.90] Standardized text for distortion testing of the code-independent elements of a complete circuit R.51 bis (1988) [Blue Book Fasc. VII.1] [Publ.: Apr.90] Standardized text for testing the elements of a complete circuit R.52 (1988) [Blue Book Fasc. VII.1] [Publ.: Apr.90] Standardization of international texts for the measurement of the margin of start-stop equipment R.53 (1988) [Blue Book Fasc. VII.1] [Publ.: Apr.90] Permissible limits for the degree of distortion on an international 50-baud/120-Hz VFT channel (frequency and amplitude modulation) R.54 (1993) [Rev.1] [2 pp.] [Publ.: Jun.94] conventional degree of distortion tolerable for standardized start-stop 50-baud systems R.55 (1993) [Rev.1] [1 pp.] [Publ.: Jun.94] Conventional degree of distortion R.56 (1993) [New] [1 pp.] [Publ.: Jul.94] Telegraph distortion limits to be quoted in Recommendations for equipment and transmission plans R.57 (1988) [Blue Book Fasc. VII.1] [Publ.: Apr.90] Standard limits of transmission quality for planning code-independent international point-to-point telegraph communications and switched networks using 50-baud start-stop equipment R.58 (1988) [Blue Book Fasc. VII.1] [Publ.: Apr.90] Standard limits of transmission quality for the gentex and telex networks R.58 bis (1988) [Blue Book Fasc. VII.1] [Publ.: Apr.90] Limits on signal transfer delay for telegraph, telex and gentex networks R.59 (1988) [Blue Book Fasc. VII.1] [Publ.: Apr.90] Interface requirements for 50-baud start-stop telegraph transmission in the maritime mobile satellite service * Correction of signals R.60 (1988) [Blue Book Fasc. VII.1] [Publ.: Apr.90] Conditions to be fulfilled by regenerative repeaters for start-stop signals of International Telegraph Alphabet No. 2 R.62 (1988) [Blue Book Fasc. VII.1] [Publ.: Apr.90] Siting of regenerative repeaters in international telex circuits * Telegraph maintenance R.70 (1988) [Blue Book Fasc. VII.1] [Publ.: Apr.90] Designation of international telegraph circuits R.70 bis (1988) [Blue Book Fasc. VII.1] [Publ.: Apr.90] Numbering of international VFT channels R.71 (1988) [Blue Book Fasc. VII.1] [Publ.: Apr.90] Organization of the maintenance of international telegraph circuits R.72 (1988) [Blue Book Fasc. VII.1] [Publ.: Apr.90] Periodicity of maintenance measurements to be carried out on the channels of international VFT systems R.73 (1988) [Blue Book Fasc. VII.1] [Publ.: Apr.90] Maintenance measurements to be carried out on VFT systems R.74 (1988) [Blue Book Fasc. VII.1] [Publ.: Apr.90] Choice of type of telegraph distortion-measuring equipment R.75 (1988) [Blue Book Fasc. VII.1] [Publ.: Apr.90] Maintenance measurements on code-independent international sections of international telegraph circuits R.75 bis (1988) [Blue Book Fasc. VII.1] [Publ.: Apr.90] Maintenance measurements of character error rate on international sections of international telegraph circuits R.76 (1988) [Blue Book Fasc. VII.1] [Publ.: Apr.90] Reserve channels for maintenance measurements on channels of international VFT systems R.77 (1988) [Blue Book Fasc. VII.1] [Publ.: Apr.90] Use of bearer circuits for voice-frequency telegraphy R.78 (1988) [Blue Book Fasc. VII.1] [Publ.: Apr.90] Pilot channel for AMVFT systems R.79 (1988) [Blue Book Fasc. VII.1] [Publ.: Apr.90] Automatic tests of transmission quality on telegraph circuits between switching centres R.80 (1988) [Blue Book Fasc. VII.1] [Publ.: Apr.90] Causes of disturbances to signals in VFT channels and their effect on telegraph distortion R.81 (1988) [Blue Book Fasc. VII.1] [Publ.: Apr.90] Maximum acceptable limit for the duration of interruption of telegraph channels arising from failure of the normal power supplies R.82 (1988) [Blue Book Fasc. VII.1] [Publ.: Apr.90] Appearance of false calling and clearing signals in circuits operated by switched teleprinter services R.83 (1988) [Blue Book Fasc. VII.1] [Publ.: Apr.90] Changes of level and interruptions in VFT channels R.90 (1988) [Blue Book Fasc. VII.1] [Publ.: Apr.90] Organization for locating and clearing faults in international telegraph switched networks R.91 (1988) [Blue Book Fasc. VII.1] [Publ.: Apr.90] General maintenance aspects for the maritime satellite telex service * Time division multiplexing R.100 (1993) [Rev.1] [4 pp.] [Publ.: Oct.94] Transmission characteristics of international TDM links R.101 (1993) [Rev.1] [14 pp.] [Publ.: Nov.94] Code and speed dependent TDM system for anisochronous telegraph and data transmission using bit interleaving R.102 (1993) [Rev.1] [11 pp.] [Publ.: Nov.94] 4800 bit/s code and speed dependent and hybrid TDM systems for anisochronous telegraph and data transmission using bit interleaving R.103 (1988) [Blue Book Fasc. VII.1] [Publ.: Apr.90] Code and speed-dependant TDM 600 bit/s system for use in point-to-point or branch-line muldex configurations R.105 (1993) [Rev.1] [3 pp.] [Publ.: Nov.94] Duplex muldex concentrator, connecting a group of gentex and telex subscribers to a telegraph exchange by assigning virtual channels to time slots of a bit-interleaved TDM system R.111 (1993) [Rev.1] [9 pp.] [Publ.: Nov.94] Code and speed independent TDM system for anisochronous telegraph and data transmission R.112 (1993) [Rev.1] [3 pp.] [Publ.: Nov.94] TDM hybrid system for anisochronous telegraph and data transmission using bit interleaving R.113 (1993) [New] [5 pp.] [Publ.: Nov.94] Combined muldex for telegraphy and synchronous data transmission R.114 (1993) [Rev.1] [3 pp.] [Publ.: Apr.94] Numbering of international TDM channels R.115 (1993) [Rev.1] [7 pp.] [Publ.: Nov.94] Maintenance loops for TDM-systems R.116 (1988) [Blue Book Fasc. VII.1] [Publ.: Apr.90] Maintenance tests to be carried out on international TDM systems R.117 (1993) [New] [4 pp.] [Publ.: Oct.94] End-to-end error performance of telegraph, telex and gentex connections involving regenerative equipment R.118 (1993) [New] [1 pp.] [Publ.: Jul.94] Performance and availability monitoring in regenerative TDM * Transmission quality above 50 bauds R.120 (1988) [Blue Book Fasc. VII.1] [Publ.: Apr.90] Tolerable limits for the degree of isochronous distortion of code-independent telegraph circuits operating at modulation rates of 75, 100 and 200 bauds R.121 (1988) [Blue Book Fasc. VII.1] [Publ.: Apr.90] Standard limits of transmission quality for start-stop user classes of service 1 and 2 on anisochronous data networks R.122 (1988) [Blue Book Fasc. VII.1] [Publ.: Apr.90] Summary of transmission plans for rates up to 300 bauds * Definitions R.140 (1988) [Blue Book Fasc. VII.1] [Publ.: Apr.90] Definitions of essential technical terms in the field of telegraph transmission * Availability and reliability of international telegraph circuits R.150 (1988) [Blue Book Fasc. VII.1] [Publ.: Apr.90] Automatic protection switching of dual diversity bearers ---------------------------------------------------------------------- Some 1120 Recommendations from the Blue Book are still in force. They are included in fascicles and volumes of the Blue Book that may still be purchased from the ITU Sales Service. Since the beginning of the 1988-1993 Study Period ("post Blue Book") ITU-T Recommendations are published and offered for sale individually (in separate fascicles). 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