Date of Last Update : 16 May 1995 List of ITU-T U-Series Recommendations in force ** - Series U * Telegraph switching - General U.1 (1993) [Rev.1] [11 pp.] [Publ.: Aug.94] Signalling conditions to be applied in the international telex service U.2 (1988) [Blue Book Fasc. VII.2] [Publ.: Apr.90] Standardization of dials and dial pulse generators for the international telex service U.3 (1988) [Blue Book Fasc. VII.2] [Publ.: Apr.90] Arrangements in switching equipment to minimize the effects of false calling signals U.4 (1988) [Blue Book Fasc. VII.2] [Publ.: Apr.90] Exchange of information regarding signals destined to be used over international circuits concerned with switched teleprinter networks U.5 (1988) [Blue Book Fasc. VII.2] [Publ.: Apr.90] Requirements to be met by regenerative repeaters in international connections U.6 (1988) [Blue Book Fasc. VII.2] [Publ.: Apr.90] Prevention of fraudulent transit traffic in the fully automatic international telex service U.7 (1993) [Rev.1] [1 pp.] [Publ.: Jun.94] Numbering schemes for automatic switching networks U.8 (1988) [Blue Book Fasc. VII.2] [Publ.: Apr.90] Hypothetical reference connections for telex and gentex networks U.10 (1993) [Rev.1] [1 pp.] [Publ.: Jul.94] Equipment of an international telex position * Specific signalling schemes and interworking between signalling systems U.11 (1993) [Rev.1] [15 pp.] [Publ.: Aug.94] Telex and gentex signalling on intercontinental circuits used for intercontinental automatic transit traffic (type c signalling) U.12 (1993) [Rev.1] [24 pp.] [Publ.: Nov.94] Terminal and transit control signalling system for telex and similar services on international circuits (type D signalling) U.15 (1993) [Rev.1] [8 pp.] [Publ.: Oct.94] Interworking rules for international signalling systems according to Recommendations U.1, U.11 and U.12 * Signalling over radio and multiplexed channels U.20 (1988) [Blue Book Fasc. VII.2] [Publ.: Apr.90] Telex and gentex signalling on radio channels (synchronous 7-unit systems affording error correction by automatic repetition) U.21 (1988) [Blue Book Fasc. VII.2] [Publ.: Apr.90] Operator recall on a telex call set up on a radiotelegraph circuit U.22 (1988) [Blue Book Fasc. VII.2] [Publ.: Apr.90] Signals indicating delay in transmission on calls set up by means of synchronous systems with automatic error correction by repetition U.23 (1988) [Blue Book Fasc. VII.2] [Publ.: Apr.90] Use of radiotelegraph circuits with ARQ equipment for fully automatic telex calls charged on the basis of elapsed time U.24 (1988) [Blue Book Fasc. VII.2] [Publ.: Apr.90] Requirements for telex and gentex operation to be met by synchronous multiplex equipment described in Recommendation R.44 U.25 (1988) [Blue Book Fasc. VII.2] [Publ.: Apr.90] Requirements for telex and gentex operation to be met by code- and speed-dependent TDM systems conforming to Recommendation R.101 * Gentex signalling U.30 (1988) [Blue Book Fasc. VII.2] [Publ.: Apr.90] Signalling conditions for use in the international gentex network U.31 (1988) [Blue Book Fasc. VII.2] [Publ.: Apr.90] Prevention of connection to faulty stations and/or station lines in the gentex service * Particular signalling facilities U.40 (1993) [Rev.1] [4 pp.] [Publ.: Aug.94] Reactions by automatic terminals connected to the telex network in the event of ineffective call attempts or signalling incidents U.41 (1988) [Blue Book Fasc. VII.2] [Publ.: Apr.90] changed address interception and call redirection in the telex service U.43 (1988) [Blue Book Fasc. VII.2] [Publ.: Apr.90] Follow-on calls U.44 (1988) [Blue Book Fasc. VII.2] [Publ.: Apr.90] Multi-address calls in real time for broadcast purposes in the international telex service U.45 (1993) [Rev.1] [3 pp.] [Publ.: Aug.94] Response to the not-ready condition of the telex terminal U.46 (1993) [New] [2 pp.] [Publ.: Mar.94] Interruption of automatic transmission and flow control in the international telex service * Radiotelex interworking U.60 (1988) [Blue Book Fasc. VII.2] [Publ.: Apr.90] General requirements to be met in interfacing the international telex network with maritime satellite systems U.61 (1993) [Rev.1] [10 pp.] [Publ.: Oct.94] Detailed requirements to be met in interfacing the international telex network with maritime satellite systems U.62 (1993) [Rev.1] [5 pp.] [Publ.: Jun.94] General requirements to be met in interfacing the international telex network with the fully automated maritime VHF/UHF radio system U.63 (1988) [Blue Book Fasc. VII.2] [Publ.: Apr.90] General requirements to be met in interfacing the international telex network with the maritime "direct printing" system * Interworking between new information services and telex U.70 (1988) [Blue Book Fasc. VII.2] [Publ.: Apr.90] Telex service signals for telex to teletex interworking U.74 (1988) [Blue Book Fasc. VII.2] [Publ.: Apr.90] Extraction of telex selection information from a calling telex answerback U.75 (1993) [Rev.1] [3 pp.] [Publ.: Oct.94] Automatic called telex answerback check * Telex store and forward U.80 (1993) [Rev.1] [15 pp.] [Publ.: Nov.94] International telex store and forward access from a telex subscriber U.81 (1993) [Rev.1] [9 pp.] [Publ.: Nov.94] International telex store-and-forward - Delivery to a telex subscriber * Intex service U.101 (1993) [New] [27 pp.] [Publ.: Aug.94] Signalling systems for the Intex service (types E and F signalling) * Definitions U.140 (1988) [Blue Book Fasc. VII.2] [Publ.: Apr.90] Definitions of essential technical terms relating to telegraph switching and signalling * The international telex service U.200 (1993) [New] [17 pp.] [Publ.: Jul.94] The international telex service - General technical requirements for interworking U.201 (1993) [Rev.1] [17 pp.] [Publ.: Nov.94] Interworking between the teletex service and the international telex service U.202 (1993) [Rev.1] [17 pp.] [Publ.: Nov.94] Technical requirements to be met in providing the international telex service within an integrated services digital network U.203 (1993) [New] [24 pp.] [Publ.: Sep.94] 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 (1993) [Rev.1] [23 pp.] [Publ.: Nov.94] Interworking between the international telex service and the public interpersonal messaging service U.205 (1993) [New] [2 pp.] [Publ.: Mar.94] 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 (1993) [New] [7 pp.] [Publ.: Jul.94] Technical requirements for interworking between the international telex service and the videotex service U.207 (1993) [New] [9 pp.] [Publ.: Jul.94] 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 (1993) [New] [7 pp.] [Publ.: Jul.94] The international telex service - Interworking with the INMARSAT c system using one-stage selection U.210 (1993) [New] [4 pp.] [Publ.: Apr.94] Intex service Network requirements to effect interworking with the international telex service U.220 (1993) [New] [6 pp.] [Publ.: Aug.94] The international telex service - Technical requirements for a status enquiry function in an interworking scenario ---------------------------------------------------------------------- Some 1120 Recommendations from the Blue Book are still in force. 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