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Telegraph switching
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U.1

Signalling conditions to be applied in the international telex service  

U.2

Standardization of dials and dial pulse generators for the international telex service  

U.3

Arrangements in switching equipment to minimize the effects of false calling signals  

U.4

Exchange of information regarding signals destined to be used over international circuits concerned with switched teleprinter networks  

U.5

Requirements to be met by regenerative repeaters in international connections  

U.6

Prevention of fraudulent transit traffic in the fully automatic international telex service  

U.7

Numbering schemes for automatic switching networks  

U.8

Hypothetical reference connections for telex and gentex networks  

U.10

Equipment of an international telex position  

U.11

Telex and gentex signalling on intercontinental circuits used for intercontinental automatic transit traffic (type C signalling)  

U.12

Terminal and transit control signalling system for telex and similar services on international circuits (type D signalling)  

U.15

Interworking rules for international signalling systems according to Recommendations U.1, U.11 and U.12  

U.20

Telex and gentex signalling on radio channels (synchronous 7-unit systems affording error correction by automatic repetition)  

U.21

Operator recall on a telex call set up on a radiotelegraph circuit  

U.22

Signals indicating delay in transmission on calls set up by means of synchronous systems with automatic error correction by repetition  

U.23

Use of radiotelegraph circuits with ARQ equipment for fully automatic telex calls charged on the basis of elapsed time  

U.24

Requirements for telex and gentex operation to be met by synchronous multiplex equipment described in Recommendation R.44  

U.25

Requirements for telex and gentex operation to be met by code- and speed-dependent TDM systems conforming to Recommendation R.101  

U.30

Signalling conditions for use in the international gentex network  

U.31

Prevention of connection to faulty stations and/or station lines in the gentex service  

U.40

Reactions by automatic terminals connected to the telex network in the event of ineffective call attempts or signalling incidents  

U.41

Changed address interception and call redirection in the telex service  

U.43

Follow-on calls  

U.44

Multi-address calls in real time for broadcast purposes in the international telex service  

U.45

Response to the not-ready condition of the telex terminal  

U.46

Interruption of automatic transmission and flow control in the international telex service  

U.60

General requirements to be met in interfacing the international telex network with maritime satellite systems  

U.61

Detailed requirements to be met in interfacing the international telex network with maritime satellite systems  

U.62

General requirements to be met in interfacing the international telex network with the fully automated maritime VHF/UHF radio system  

U.63

General requirements to be met in interfacing the international telex network with the maritime "direct printing" system  

U.70

Telex service signals for telex to teletex interworking  

U.74

Extraction of telex selection information from a calling telex answerback  

U.75

Automatic called telex answerback check  

U.80

International telex store and forward access from a telex subscriber  

U.81

International telex store-and-forward - Delivery to a telex subscriber  

U.82

[Withdrawn] International telex store and forward - Interconnection of telex store and forward units  

U.101

Signalling systems for the Intex service (types E and F signalling)  

U.102

Intex and similar services - Network requirements to effect interworking between terminals operating at different speeds  

U.140

Definitions of essential technical terms relating to telegraph switching and signalling  

U.200

The international telex service - General technical requirements for interworking  

U.201

Interworking between the teletex service and the international telex service  

U.202

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

U.203

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  

U.204

Interworking between the international telex service and the public interpersonal messaging service  

U.205

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  

U.206

Technical requirements for interworking between the international telex service and the videotex service  

U.207

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  

U.208

The international telex service - Interworking with the INMARSAT C system using one-stage selection  

U.210

Intex service network requirements to effect interworking with the international telex service  

U.220

The international telex service - Technical requirements for a status enquiry function in an interworking scenario  

U.Sup1

[Withdrawn] Signalling characteristics and timing of the MARISAT telex service  

U.Sup2

[Withdrawn] Signalling arrangements in the Maritime Satellite Telex Service via the MARISAT system  

U.Sup3

[Withdrawn] Telex signalling arrangements in the Nordic Maritime Satellite coast Earth Station  

 

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Updated : 2011.03.15