ITU-T F.30-1993 特殊目的的各种组合序列的使用 Use of Various Sequences of Combinations for Special Purposes - Operations and Quality of Service; T

pdf标准 ITU-T F.30-1993 特殊目的的各种组合序列的使用 Use of Various Sequences of Combinations for Special Purposes - Operations and Quality of Service; T

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ITU-T F.30-1993 特殊目的的各种组合序列的使用 Use of Various Sequences of Combinations for Special Purposes - Operations and Quality of Service; T 第 1 页 ITU-T F.30-1993 特殊目的的各种组合序列的使用 Use of Various Sequences of Combinations for Special Purposes - Operations and Quality of Service; T 第 2 页 ITU-T F.30-1993 特殊目的的各种组合序列的使用 Use of Various Sequences of Combinations for Special Purposes - Operations and Quality of Service; T 第 3 页 ITU-T F.30-1993 特殊目的的各种组合序列的使用 Use of Various Sequences of Combinations for Special Purposes - Operations and Quality of Service; T 第 4 页
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国外分类,ITU,ITU-T(电信标准分局),itu,特殊,目的,各种,组合,序列,使用,use,of,various,sequences,of,combinations,for,special,purposes,operations,and,quality,of,service

INTERNATIONAL TELECOMMUNICATION UNION )45 4 TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU & (03/93) /0%2!4)/.3 !.$ 15!,)49 /& 3%26)#% 4%,%'2!0( 3%26)#%3 53% /& 6!2)/53 3%15%.#%3 /& #/-").!4)/.3 &/2 30%#)!, 0520/3%3 )45 4 Recommendation & (Previously “CCITT Recommendation”) FOREWORD The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of the International Telecommunication Union. The ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Conference (WTSC), which meets every four years, established the topics for study by the ITU-T Study Groups which, in their turn, produce Recommendations on these topics. ITU-T Recommendation F.30 was revised by the ITU-T Study Group I (1988-1993) and was approved by the WTSC (Helsinki, March 1-12, 1993). ___________________ NOTES 1 As a consequence of a reform process within the International Telecommunication Union (ITU), the CCITT ceased to exist as of 28 February 1993. In its place, the ITU Telecommunication Standardization Sector (ITU-T) was created as of 1 March 1993. Similarly, in this reform process, the CCIR and the IFRB have been replaced by the Radiocommunication Sector. In order not to delay publication of this Recommendation, no change has been made in the text to references containing the acronyms “CCITT, CCIR or IFRB” or their associated entities such as Plenary Assembly, Secretariat, etc. Future editions of this Recommendation will contain the proper terminology related to the new ITU structure. 2 In this Recommendation, the expression “Administration” is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. © ITU 1993 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the ITU. Recommendation F.30 Recommendation F.30 (03/93) USE OF VARIOUS SEQUENCES OF COMBINATIONS FOR SPECIAL PURPOSES (Melbourne, 1988; revised Helsinki, 1993) The CCITT, unanimously declares that 1) when it is necessary to provide for switching of telegrams to different routes in semi-automatic or fully automatic telegram retransmission systems, the beginning and ending of each telegram are identified by the insertion of start-of-message and end-of-message signals; 2) the start-of-message signal consists of the sequence ZCZC in letter case; 3) the end-of-message signal consists of the sequence NNNN, in letter case; 4) the equipment that recognizes the start-of-message and end-of-message signals may be designed to do so by searching only for the sequence of four combinations corresponding to ZCZC or NNNN respectively (i.e. combinations 26, 3, 26, 3 or 14, 14, 14, 14 in International Telegraph Alphabet No. 2 regardless of whether they are in letter or figure case); 5) Table 1 lists other sequences of combinations used for special purposes. Recommendation F.30 (03/93) 1 TABLE 1/F.30 Printed position Purpose of sequence Sequence of combination Letter case Figure case Recommendation reference Connection of reperforator (or equivalent device) 3333 CCCC :::: S.4 Disconnection of reperforator (or equivalent device) 6666 FFFF (Note 1) S.4 Suppression of delay signals 8888 HHHH (Note 1) S.4, U.22 Ready for test 11 11 11 11 KKKK (((( R.79, R.79 bis Switching a reader (or equivalent device) into circuit by remote control 11 12 11 12 KLKL ()() S.4 End of message or enabling of delay signals 14 14 14 14 NNNN ,,,, F.1, F.31, S.4, U.22 Change of alphabet 19 19 19 19 SSSS ’’’’ S.15 24 24 24 24 24 XXXXX ///// F.1 (C111) 26 3 26 3 ZCZC +: +: F.1, F.31 End of input 26 26 26 26 ZZZZ ++++ F.200 Request for automatic advice of parties cleared prematurely during the broadcast call followed by call cleared 13 13 13 13 (Note 3) MMMM (Note 3) (Note 2) S.4, U.44 Error signal Start of message WRU signal 30 4 S.6 Operator recall over radiotelegraph circuit 28 27 27 27 27 Stop transmission from distant auto terminal 20 20 20 ... (Note 4) T T T ... (Note 4) 10 .... (Notes 4 and 5) J... (Notes 4 and 5) 12 12 12 12 LLLL Interrogation of distant terminal Follow-on call (Note 6) U.21 5 5 5 ... S.4 S.4, S.22 )))) S.4, U.43 NOTES 1 As noted in C5/F.1, the figure case of combinations 6, 7 and 8 is available for the internal service of each Administration. 2 As noted in Recommendation U.44 this sequence is to be recognized in letter case only. 3 A minimum of 4 Ms would clear a telex broadcast call. The usage of a 5th or more Ms is a national matter. 4 Repeated if necessary. 5 Function only applicable in figure case. 6 See also Table 2/S.1. 2 Recommendation F.30 (03/93)

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