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Telegraph transmission
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R.2

Element error rate  

R.4

Methods for the separate measurements of the degrees of various types of telegraph distortion  

R.5

Observation conditions recommended for routine distortion measurements on international telegraph circuits  

R.9

How the laws governing distribution of distortion should be arrived at  

R.11

Calculation of the degree of distortion of a telegraph circuit in terms of the degrees of distortion of the component links  

R.20

Telegraph modem for subscriber lines  

R.21

9600 bit/s modem standardized for use in the telegraph TDM system  

R.22

Data over voice 19 200 bit/s modem standardized for use on telephone network subscriber lines  

R.30

Transmission characteristic for international VFT links  

R.31

Standardization of AMVFT systems for a modulation rate of 50 bauds  

R.35

Standardization of FMVFT systems for a modulation rate of 50 bauds  

R.35bis

50-baud wideband VFT systems  

R.36

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

Standardization of FMVFT systems for a modulation rate of 100 bauds  

R.38A

Standardization of FMVFT system for a modulation rate of 200 bauds with channels spaced at 480 Hz  

R.38B

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

Voice-frequency telegraphy on radio circuits  

R.40

Coexistence in the same cable of telephony and super-telephone telegraphy  

R.43

Simultaneous communication by telephone and telegraph on a telephone-type circuit  

R.44

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

Interband telegraphy over open-wire 3-channel carrier systems  

R.50

Tolerable limits for the degree of isochronous distortion of code-independent 50-baud telegraph circuits  

R.51

Standardized text for distortion testing of the code-independent elements of a complete circuit  

R.51bis

Standardized text for testing the elements of a complete circuit  

R.52

Standardization of international texts for the measurement of the margin of start-stop equipment  

R.53

Permissible limits for the degree of distortion on an international 50-baud/120-Hz VFT channel (frequency and amplitude modulation)  

R.54

Conventional degree of distortion tolerable for standardized start-stop 50-baud systems  

R.55

Conventional degree of distortion  

R.56

Telegraph distortion limits to be quoted in Recommendations for equipment and transmission plans  

R.57

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

Standard limits of transmission quality for the gentex and telex networks  

R.58bis

Limits on signal transfer delay for telegraph, telex and gentex networks  

R.59

Interface requirements for 50-baud start-stop telegraph transmission in the maritime mobile satellite service  

R.60

Conditions to be fulfilled by regenerative repeaters for start-stop signals of International Telegraph Alphabet No. 2  

R.62

Siting of regenerative repeaters in international telex circuits  

R.70

Designation of international telegraph circuits  

R.70bis

Numbering of international VFT channels  

R.71

Organization of the maintenance of international telegraph circuits  

R.72

Periodicity of maintenance measurements to be carried out on the channels of international VFT systems  

R.73

Maintenance measurements to be carried out on VFT systems  

R.74

Choice of type of telegraph distortion-measuring equipment  

R.75

Maintenance measurements on code-independent international sections of international telegraph circuits  

R.75bis

Maintenance measurements of character error rate on international sections of international telegraph circuits  

R.76

Reserve channels for maintenance measurements on channels of international VFT systems  

R.77

Use of bearer circuits for voice-frequency telegraphy  

R.78

Pilot channel for AMVFT systems  

R.79

Automatic tests of transmission quality on telegraph circuits between switching centres  

R.80

Causes of disturbances to signals in VFT channels and their effect on telegraph distortion  

R.81

Maximum acceptable limit for the duration of interruption of telegraph channels arising from failure of the normal power supplies  

R.82

Appearance of false calling and clearing signals in circuits operated by switched teleprinter services  

R.83

Changes of level and interruptions in VFT channels  

R.90

Organization for locating and clearing faults in international telegraph switched networks  

R.91

General maintenance aspects for the maritime satellite telex service  

R.100

Transmission characteristics of international TDM links  

R.101

Code and speed dependent TDM system for anisochronous telegraph and data transmission using bit interleaving  

R.102

4800 bit/s code and speed dependent and hybrid TDM systems for anisochronous telegraph and data transmission using bit interleaving  

R.103

Code and speed-dependent TDM 600 bit/s system for use in point-to-point or branch-line muldex configurations  

R.105

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.106

Muldex unit for telegraph and low speed data transmission using TDM bit interleaving with an aggregate bit rate higher than 4800 bit/s  

R.111

Code and speed independent TDM system for anisochronous telegraph and data transmission  

R.112

TDM hybrid system for anisochronous telegraph and data transmission using bit interleaving  

R.113

Combined muldex for telegraphy and synchronous data transmission  

R.114

Numbering of international TDM channels  

R.115

Maintenance loops for TDM-systems  

R.116

Maintenance tests to be carried out on international TDM systems  

R.117

End-to-end error performance for telegraph, telex and gentex connections involving regenerative equipment  

R.118

Performance and availability monitoring in regenerative TDM  

R.120

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

Standard limits of transmission quality for start-stop user classes of service 1 and 2 on anisochronous data networks  

R.122

Summary of transmission plans for rates up to 300 bauds  

R.140

Definitions of essential technical terms in the field of telegraph transmission  

R.150

Automatic protection switching of dual diversity bearers  

 

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Updated : 2014-05-15