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Overview of operational procedures for the GTS

Overview of operational procedures for the GTS. Operational principles for the GTS. Meteorological data shall be collected, exchanged and distributed in the meteorological bulletin format The meteorological format shall depend on the mode of operation and engineering of circuits and centres

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Overview of operational procedures for the GTS

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  1. Overview of operational procedures for the GTS Training Seminar on ICT for GTS (Bangkok, 23 - 27 September 2002) - Slide 1

  2. Operational principles for the GTS • Meteorological data shall be collected, exchanged and distributed in the meteorological bulletin format • The meteorological format shall depend on the mode of operation and engineering of circuits and centres • Transmission of meteorological information over the GTS shall be in accordance with agreed plans Training Seminar on ICT for GTS (Bangkok, 23 - 27 September 2002) - Slide 2

  3. Operational principles for the GTS • Non-routine messages and service messages shall be transmitted as addressed messages • Scheduling of transmission shall be made on the basis of four levels of priority Training Seminar on ICT for GTS (Bangkok, 23 - 27 September 2002) - Slide 3

  4. Operational principles for the GTS • Non-routine messages and service messages shall be transmitted as addressed messages • Scheduling of transmission shall be made on the basis of four levels of priority Training Seminar on ICT for GTS (Bangkok, 23 - 27 September 2002) - Slide 4

  5. Format of meteorological messages A starting line An abbreviated heading A text Meteorological Bulletin Meteorological Message End-of-message signals Training Seminar on ICT for GTS (Bangkok, 23 - 27 September 2002) - Slide 5

  6. Format of meteorological messages • Alphanumerical messages • International alphabet No.2 • International alphabet No.5 • Binary messages • Starting line, abbreviated heading and end-of-messages signals in International alphabet No.5 Training Seminar on ICT for GTS (Bangkok, 23 - 27 September 2002) - Slide 6

  7. Format of meteorological messages • The starting line • IA No. 2: [ cr ] [cr ] [ lf ] ZCZC nnn • IA No. 5: [ SOH ] [ cr ] [cr ] [ lf ] nnn(nn) • nnn(nn): transmission sequence number Training Seminar on ICT for GTS (Bangkok, 23 - 27 September 2002) - Slide 7

  8. Format of meteorological messages • Abbreviated heading • [ cr ] [cr ] [ lf ] T1T2 A1A2ii CCCC YYGGgg BBB • Two different bulletins shall have different abbreviated headings • T1T2 A1A2ii: Designators • CCCC: International four-letter indicators • YYGGgg: Group date/time • BBB (RRx, CCx, AAx, Pxx) Training Seminar on ICT for GTS (Bangkok, 23 - 27 September 2002) - Slide 8

  9. Format of meteorological messages • Text • In one code form only • Starts by [ cr ] [cr ] [ lf ] • Each individual meteorological report shall start with [ cr ] [cr ] [ lf ] • Signal No. 22 represented as an equal sign = shall be used as an "end-of-report indicator" Training Seminar on ICT for GTS (Bangkok, 23 - 27 September 2002) - Slide 9

  10. Format of meteorological messages • End-of-message signals • IA No. 2: [ cr ] [ cr ] [ lf ] [ lf ] [ lf ] [ lf ] [ lf ] [ lf ] [ lf ] [ lf ] NNNN • IA No. 5: [ cr ] [ cr ] [ lf ] [ETX] Training Seminar on ICT for GTS (Bangkok, 23 - 27 September 2002) - Slide 10

  11. Example of a meteorological message SOH] [ cr ] [ cr ] [ lf ] 345 [ cr ] [ cr ] [ lf ] SMYG10 [space] LYBM [space] 280000 [ cr ] [ cr ] [ lf ] AAXX [space] 28001 [ cr ] [ cr ] [ lf ] 13131 [space] ..... [space] ..... [space] ..... [space] etc...= [ cr ] [ cr ] [ lf ] 13272 [space] ..... [space] ..... [space] ..... [space] etc...= [ cr ] [ cr ] [ lf ] 13333 [space] ..... [space] ..... [space] ..... [space] etc...= [ cr ] [ cr ] [ lf ] 13462 [space] ..... [space] ..... [space] ..... [space] etc...= [ cr ] [ cr ] [ lf ] 13586 [space] NIL = [ cr ] [ cr ] [ lf ] [ETX] Training Seminar on ICT for GTS (Bangkok, 23 - 27 September 2002) - Slide 11

  12. Addressed messages • T1T2 A1A2ii Ca Ca Ca Ca YYGGgg BBB • T1T2= BM, BI • A1A2= AA, BB, RR, RQ, DA • ii = 01 • Ca Ca Ca Ca: location indicator of the addressed centre • YYGGgg: Time of insertion into the GTS Training Seminar on ICT for GTS (Bangkok, 23 - 27 September 2002) - Slide 12

  13. Addressed messages • Request for GTS messages • Request for repetition to an adjacent centre • Replies to requests for GTS messages Training Seminar on ICT for GTS (Bangkok, 23 - 27 September 2002) - Slide 13

  14. Length of meteorological messages • Maximum length: 15000 octets except for coded digital facsimile products • Sets of information, transmitted using segmentation into a series of bulletins, shall not exceed 250000 octets • Sets of information may be exchanged using the file transfer technique, particularly where sets larger than 250000 octets are concerned Training Seminar on ICT for GTS (Bangkok, 23 - 27 September 2002) - Slide 14

  15. Telecommunication centres • Maximum delay for relay of a message: 15 seconds, three minutes if a conversion is required • Minimum storage capacity: 24 hours • Duplicated messages received within at least three hours of the original messages should be detected and eliminated • Regular review of the content of the switching directories Training Seminar on ICT for GTS (Bangkok, 23 - 27 September 2002) - Slide 15

  16. Routeing catalogues • The routeing catalogues of the GTS centres provide information on the routeing of bulletins on the GTS, i.e. on the relay of the bulletins on the GTS point-to-point circuits and their distribution on the point-to-multipoint circuits such as the satellite distribution systems.The routeing catalogues or the information needed for their access is available in: • http://www.wmo.ch/web/www/ois/routeing-catalogue/routeing-home.htm Training Seminar on ICT for GTS (Bangkok, 23 - 27 September 2002) - Slide 16

  17. Catalogue of meteorological bulletins • Contains a list of compiling or editing centres of the Global Telecommunication System and a list of meteorological bulletins being transmitted for global, inter-regional and regional exchanges. Each bulletin is uniquely identified by the abbreviated heading (TTAAii CCCC). • Is maintained by the MTN centres (and the Secretariat), who should receive the updates from their associated NMCs Training Seminar on ICT for GTS (Bangkok, 23 - 27 September 2002) - Slide 17

  18. WMO Secretariat Valid catalogue files Advanced notification files ... ... FTP PUT with e-mail notification Responsible RTHs Valid catalogue ... Advanced notification files files ... ... FTP GET FTP GET or by diskett Messages of amendments on bulletins by e-mail, fax or GTS addressed message NMC ... WMO Members RTH NMC Responsible zones Training Seminar on ICT for GTS (Bangkok, 23 - 27 September 2002) - Slide 18

  19. Operational information • Volume C1, METNO • Routeing catalogues • Monitoring results • Operational Newsletter on the World Weather Watch and Marine Meteorological Services • Available from: • http://www.wmo.ch/web/www/ois/ois-home.htm Training Seminar on ICT for GTS (Bangkok, 23 - 27 September 2002) - Slide 19

  20. Reference in the Manual on the GTS • Organisational procedures for the GTS: Manual on the GTS, Volume I, Part II Training Seminar on ICT for GTS (Bangkok, 23 - 27 September 2002) - Slide 20

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