Telecommunication System Bernd Richter, RTH Offenbach MSS EDZW := MTSO Meteorological Telecommunication System Offenbach Bernd Richter, RTH Offenbach MTSO

RTH Offenbach Main Tasks RTH in the WMO MTN Continuous reception and dissemination of meteo- rological data (ASCII and Binary) in bulletins or files via RMDCN (GTS), AFTN (ICAO) Internet, leased lines, HF Radio Broadcast, Satellite DWDSAT etc. Supply of the German National Computer Centre, National Regional Offices and Research Vessels with meteorological data and products Main Purpose

March 1982 DEC PDP 11/44-System (GEI-MSS) March 1990 Migration to a VAX-Cluster (WMO-MSS) December 1992 Deactivation of the PDP 11/44-System April 1996 Transition to MSS II and AFD on Stratus Continuum 620 FTX OS = System V Rel. 4 UNIX derivative; implementation of TCP/IP protocols (ftp/sockets) November 2002 MSS on a high availability-Cluster Primepower 400 with SUN-Solaris 8 (Fujitsu Siemens Computer) August 2008 MSS High-Availability-Cluster Primargy 300S Fujitsu FSC SLES10 S October 2008 MSS-Software-Migration to IBL-soft Moving Weather History

Switching Software (MSS/AFD) Message Switching Software, Main features Full compliance to WMO- / ICAO - Standards and Recommendations  High Performance, Graphical User Interface  Online Configuration, context sensitive help Interfaces to other standard communication devices Easy extension due to modular design Send / retrieve any type of file, bulletin and report File distribution with priority Moving Weather Switching Software (MSS/AFD) Moving Weather Moving Weather Moving Weather

Main Telecommunication Network Main Telecommunication Network (MTN) Main Telecommunication Network

Regional Meteorological Telecommunication Network

National Meteorological Telecommunication Network

MSS Connections Approximately 120 virtual channels configured Apart from international connections within the WMO networks several connections to International Organisations, DWD Regional Offices in Germany, Universities, authorities and other customers. MTN connections - Beijing (RA II), Jeddah (RA II), Nairobi (RA I), Prague and Toulouse RMTN connections - Exeter, Norrköping, Rome, Vienna, Warszawa RTH-Responsibility - Israel (Bet Dagan), Switzerland (Zurich) Bilateral connections - Amman, Ankara, Athens, De Bilt, Kobenhavn, Madrid, Abu Dhabi, Doha, Teheran, Ljubljana Int. Organisations - ICAO, ECMWF, ESOC, EUMETSAT Dissemination services - HF Radio Broadcast (F1B and F1C), DWDSAT MSS Connectivity

MSS connections continued Protocol types used with the connected lines: Asynchronous incl. Modem-connections, HF Broadcast (3 international, 2 national, 1 DWD internal) E-mail Antarctica, R/V Polarstern, Meteor, Universities, D-CMET DROP, IAEA FTP (35 international, 53 national) TCP/IP-Sockets incl. special ACK procedure (level4) (20 international, 4 national) CIDIN, X-25 withdrawn from use in 2008 Protocols

Bandwidth / kbps and percentage of lines from / to RTH Offenbach OUT/IN kbps % Bandwidth CCCC/ORG ISO City 512 41.0 ECMW GBR Reading 128/64 10.3 LSSW CHE Zurich 64 5.1 LFPW FRA Toulouse 64 5.1 EUMS DEU Darmstadt 64 5.1 LOWM AUT Vienna 64 5.1 ESWI SWE Norrköping 48/64 3.8 EGRR GBR Exeter 48 3.8 BABJ CHN Beijing 32 2.6 OKPR CZE Praha 32 2.6 LIIB ITA Rome 32 2.6 LTAA TUR Ankara 32 2.6 LGAT GRE Athens 32/16 2.6 LYBM FYU Beograd 16/ 8 1.3 OEJD SAU Jeddah 16 1.3 EKCH DNK Kobenhavn 16 1.3 LEMM ESP Madrid 16 1.3 OMAE UAE Abu Dhabi 16/ 8 1.3 OJAM JOR Amman 16/ 8 1.3 SOWR POL Warszawa 1248 kbps 100 TOTAL Bandwidth / kbps and percentage of lines from / to RTH Offenbach

MSS Throughput: current / expected Data Traffic of EDZW MSS per day current number of messages Input: 570.000 (6 GB) Output: 4,3 Million (16 GB) IN: 6 GB number of files Input: 74.000 OUT: 16 GB Output: 557.000 expected within 5 years input: 1 Million output: 7 Million IN: 70 GB input: 1 Million OUT: 200 GB output: 5 Million MSS Throughput: current / expected

MSS Database 48.000 routing entries with control information Storage time - report extraction - protection - DTG-checks - double check by checksum - transmission information etc. (230 ignore, 400 compiled, 450 sub, 33920 input messages) 1.100 scheduler entries 240.400 report database entries in 65 different definition records 12.500 entries in Station Catalogue MSS Database

MSS: Technical / financial Characteristics System Availability 99.98 % Max. outage time / monthly sum 12‘ / 46‘ Maintenance Response Time 4 hrs Time delay bulletins / files < 1 sec Time delay with bulletin compilation < 3 min Storage capacity reports / bulletins limited by disc-space only Max. length of bulletin, ASCII 15 kB, WMO-part. 250 kB Max. length of bulletin, binary 2600 kB, WMO-part. 500 kB Max.Traffic per 5 minutes IN/OUT 70 MB / 82 MB Avrg.Traffic messages p.s. IN/OUT 3 / 22 System price 350 kEuro Maintenance , Modification 40 kEuro / year RTH / other connections 500 kEuro / year Typica