U.1
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Signalling conditions to be applied in the international telex service
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U.2
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Standardization of dials and dial pulse generators for the international telex service
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U.3
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Arrangements in switching equipment to minimize the effects of false calling signals
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U.4
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Exchange of information regarding signals destined to be used over international circuits concerned with switched teleprinter networks
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U.5
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Requirements to be met by regenerative repeaters in international connections
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U.6
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Prevention of fraudulent transit traffic in the fully automatic international telex service
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U.7
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Numbering schemes for automatic switching networks
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U.8
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Hypothetical reference connections for telex and gentex networks
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U.10
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Equipment of an international telex position
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U.11
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Telex and gentex signalling on intercontinental circuits used for intercontinental automatic transit traffic (type C signalling)
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U.12
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Terminal and transit control signalling system for telex and similar services on international circuits (type D signalling)
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U.15
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Interworking rules for international signalling systems according to Recommendations U.1, U.11 and U.12
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U.20
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Telex and gentex signalling on radio channels (synchronous 7-unit systems affording error correction by automatic repetition)
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U.21
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Operator recall on a telex call set up on a radiotelegraph circuit
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U.22
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Signals indicating delay in transmission on calls set up by means of synchronous systems with automatic error correction by repetition
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U.23
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Use of radiotelegraph circuits with ARQ equipment for fully automatic telex calls charged on the basis of elapsed time
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U.24
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Requirements for telex and gentex operation to be met by synchronous multiplex equipment described in Recommendation R.44
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U.25
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Requirements for telex and gentex operation to be met by code- and speed-dependent TDM systems conforming to Recommendation R.101
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U.30
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Signalling conditions for use in the international gentex network
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U.31
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Prevention of connection to faulty stations and/or station lines in the gentex service
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U.40
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Reactions by automatic terminals connected to the telex network in the event of ineffective call attempts or signalling incidents
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U.41
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Changed address interception and call redirection in the telex service
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U.43
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Follow-on calls
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U.44
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Multi-address calls in real time for broadcast purposes in the international telex service
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U.45
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Response to the not-ready condition of the telex terminal
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U.46
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Interruption of automatic transmission and flow control in the international telex service
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U.60
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General requirements to be met in interfacing the international telex network with maritime satellite systems
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U.61
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Detailed requirements to be met in interfacing the international telex network with maritime satellite systems
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U.62
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General requirements to be met in interfacing the international telex network with the fully automated maritime VHF/UHF radio system
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U.63
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General requirements to be met in interfacing the international telex network with the maritime "direct printing" system
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U.70
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Telex service signals for telex to teletex interworking
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U.74
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Extraction of telex selection information from a calling telex answerback
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U.75
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Automatic called telex answerback check
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U.80
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International telex store and forward access from a telex subscriber
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U.81
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International telex store-and-forward - Delivery to a telex subscriber
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U.82
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[Withdrawn] International telex store and forward - Interconnection of telex store and forward units
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U.101
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Signalling systems for the Intex service (types E and F signalling)
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U.102
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Intex and similar services - Network requirements to effect interworking between terminals operating at different speeds
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U.140
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Definitions of essential technical terms relating to telegraph switching and signalling
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U.200
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The international telex service - General technical requirements for interworking
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U.201
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Interworking between the teletex service and the international telex service
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U.202
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Technical requirements to be met in providing the international telex service within an integrated services digital network
This Recommendation is also included but not published in I series under alias number I.560
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U.203
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Technical requirements to be met when providing real-time bothway communications between terminals of the international telex service and data terminal equipments on a PSPDN or via the PSTN
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U.204
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Interworking between the international telex service and the public interpersonal messaging service
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U.205
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Store-and-retrieve facility for the delivery of messages from a terminal of the international telex service to a data terminal equipment which connects to a packet-switched public data network over the public switched telephone network
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U.206
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Technical requirements for interworking between the international telex service and the videotex service
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U.207
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Technical requirements to be met for the transfer of messages between terminals of the international telex service and Group 3 facsimile terminals connected to the PSTN
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U.208
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The international telex service - Interworking with the INMARSAT C system using one-stage selection
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U.210
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Intex service network requirements to effect interworking with the international telex service
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U.220
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The international telex service - Technical requirements for a status enquiry function in an interworking scenario
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U.Sup1
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[Withdrawn] Signalling characteristics and timing of the MARISAT telex service
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U.Sup2
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[Withdrawn] Signalling arrangements in the Maritime Satellite Telex Service via the MARISAT system
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U.Sup3
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[Withdrawn] Telex signalling arrangements in the Nordic Maritime Satellite coast Earth Station
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