R.2
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Element error rate
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R.4
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Methods for the separate measurements of the degrees of various types of telegraph distortion
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R.5
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Observation conditions recommended for routine distortion measurements on international telegraph circuits
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R.9
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How the laws governing distribution of distortion should be arrived at
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R.11
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Calculation of the degree of distortion of a telegraph circuit in terms of the degrees of distortion of the component links
�
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R.20
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Telegraph modem for subscriber lines
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R.21
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9600 bit/s modem standardized for use in the telegraph TDM system
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R.22
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Data over voice 19 200 bit/s modem standardized for use on telephone network subscriber lines
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R.30
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Transmission characteristic for international VFT links
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R.31
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Standardization of AMVFT systems for a modulation rate of 50 bauds
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R.35
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Standardization of FMVFT systems for a modulation rate of 50 bauds
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R.35bis
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50-baud wideband VFT systems
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R.36
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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
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R.37
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Standardization of FMVFT systems for a modulation rate of 100 bauds
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R.38A
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Standardization of FMVFT system for a modulation rate of 200 bauds with channels spaced at 480 Hz
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R.38B
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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
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R.39
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Voice-frequency telegraphy on radio circuits
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R.40
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Coexistence in the same cable of telephony and super-telephone telegraphy
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R.43
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Simultaneous communication by telephone and telegraph on a telephone-type circuit
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R.44
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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
�
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R.49
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Interband telegraphy over open-wire 3-channel carrier systems
�
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R.50
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Tolerable limits for the degree of isochronous distortion of code-independent 50-baud telegraph circuits
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R.51
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Standardized text for distortion testing of the code-independent elements of a complete circuit
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R.51bis
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Standardized text for testing the elements of a complete circuit
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R.52
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Standardization of international texts for the measurement of the margin of start-stop equipment
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R.53
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Permissible limits for the degree of distortion on an international 50-baud/120-Hz VFT channel (frequency and amplitude modulation)
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R.54
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Conventional degree of distortion tolerable for standardized start-stop 50-baud systems
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R.55
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Conventional degree of distortion
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R.56
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Telegraph distortion limits to be quoted in Recommendations for equipment and transmission plans
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R.57
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Standard limits of transmission quality for planning code-independent international point-to-point telegraph communications and switched networks using 50-baud start-stop equipment
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R.58
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Standard limits of transmission quality for the gentex and telex networks
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R.58bis
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Limits on signal transfer delay for telegraph, telex and gentex networks
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R.59
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Interface requirements for 50-baud start-stop telegraph transmission in the maritime mobile satellite service
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R.60
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Conditions to be fulfilled by regenerative repeaters for start-stop signals of International Telegraph Alphabet No. 2
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R.62
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Siting of regenerative repeaters in international telex circuits
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R.70
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Designation of international telegraph circuits
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R.70bis
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Numbering of international VFT channels
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R.71
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Organization of the maintenance of international telegraph circuits
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R.72
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Periodicity of maintenance measurements to be carried out on the channels of international VFT systems
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R.73
|
Maintenance measurements to be carried out on VFT systems
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R.74
|
Choice of type of telegraph distortion-measuring equipment
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R.75
|
Maintenance measurements on code-independent international sections of international telegraph circuits
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R.75bis
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Maintenance measurements of character error rate on international sections of international telegraph circuits
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R.76
|
Reserve channels for maintenance measurements on channels of international VFT systems
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R.77
|
Use of bearer circuits for voice-frequency telegraphy
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R.78
|
Pilot channel for AMVFT systems
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R.79
|
Automatic tests of transmission quality on telegraph circuits between switching centres
�
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R.80
|
Causes of disturbances to signals in VFT channels and their effect on telegraph distortion
�
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R.81
|
Maximum acceptable limit for the duration of interruption of telegraph channels arising from failure of the normal power supplies
�
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R.82
|
Appearance of false calling and clearing signals in circuits operated by switched teleprinter services
�
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R.83
|
Changes of level and interruptions in VFT channels
�
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R.90
|
Organization for locating and clearing faults in international telegraph switched networks
�
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R.91
|
General maintenance aspects for the maritime satellite telex service
�
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R.100
|
Transmission characteristics of international TDM links
�
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R.101
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Code and speed dependent TDM system for anisochronous telegraph and data transmission using bit interleaving
�
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R.102
|
4800 bit/s code and speed dependent and hybrid TDM systems for anisochronous telegraph and data transmission using bit interleaving
�
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R.103
|
Code and speed-dependent TDM 600 bit/s system for use in point-to-point or branch-line muldex configurations
�
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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
�
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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
�
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R.111
|
Code and speed independent TDM system for anisochronous telegraph and data transmission
�
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R.112
|
TDM hybrid system for anisochronous telegraph and data transmission using bit interleaving
�
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R.113
|
Combined muldex for telegraphy and synchronous data transmission
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R.114
|
Numbering of international TDM channels
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R.115
|
Maintenance loops for TDM-systems
�
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R.116
|
Maintenance tests to be carried out on international TDM systems
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R.117
|
End-to-end error performance for telegraph, telex and gentex connections involving regenerative equipment
�
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R.118
|
Performance and availability monitoring in regenerative TDM
�
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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
�
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R.121
|
Standard limits of transmission quality for start-stop user classes of service 1 and 2 on anisochronous data networks
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R.122
|
Summary of transmission plans for rates up to 300 bauds
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R.140
|
Definitions of essential technical terms in the field of telegraph transmission
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R.150
|
Automatic protection switching of dual diversity bearers
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